38 results about "Neutron diffraction" patented technology

The invention provides a space measurement and analysis method and system for a neutron diffraction rocking curve of a single crystal material, and the method comprises the steps: S1, building a laboratory coordinate system and a sample coordinate system, and setting a test point grid; s2, collecting a two-dimensional diffraction image of each test point to obtain angle information of the test point; s3, integrating the angle information of the test points based on the test point grid, and preprocessing the two-dimensional diffraction image; s4, extracting key structure parameters of each test point based on the preprocessed two-dimensional diffraction image; s5, constructing a stress field according to the key structure parameters; and S6, constructing a distribution map of crystal internal lattice parameters in a three-dimensional space according to the stress field. The method provided by the invention effectively improves the capability of identifying the non-uniformity and local distortion of the crystal structure, can be widely applied to the fields of residual stress evaluation, defect evolution monitoring, material quality control and the like, and has a remarkable engineering application value.

The invention provides a device and a method for detecting residual stress and defects of a diaphragm by a neutron source. The device comprises a neutron source, a neutron detector, a diaphragm fixing assembly and a console, and the residual stress and defects of the diaphragm are nondestructively detected through a neutron diffraction technology. The diaphragm is fixed through the diaphragm fixing assembly, and the neutron beam of the neutron source is adjusted, so that the neutron beam completely covers the diaphragm; adjusting the angle of the diaphragm through the diaphragm fixing assembly, repeatedly recording stable diffraction signals to obtain multiple groups of strain data, and analyzing and processing to generate a residual stress nephogram and a defect distribution result. According to the scheme, accurate detection of residual stress and defects of the to-be-detected diaphragm is realized through the neutron diffraction technology, the method has the advantage of nondestructive detection, avoids damage to the diaphragm, is suitable for detection of various diaphragm materials, is accurate in measurement and simple and convenient to operate, reduces manual operation errors, and improves the detection accuracy. And meanwhile, the data is further analyzed and processed by utilizing cloud computing and a big data technology, so that the detection accuracy and efficiency are improved.

The utility model discloses a positioning adjusting device for a neutron diffraction experiment, and belongs to the technical field of neutron diffraction experiments. The positioning adjusting device for the neutron diffraction experiment comprises a cantilever supporting frame, a rotary driving mechanism, a linear driving mechanism and a connecting frame, wherein one end of the cantilever supporting frame is connected to a rack of neutron diffraction experiment equipment; the rotary driving mechanism is arranged at the other end of the cantilever supporting frame; the linear driving mechanism is connected to the output end of the rotary driving mechanism, and the rotary driving mechanism is used for driving the linear driving mechanism to rotate in an XY plane; the lower portion of the connecting frame is used for installing a fine collimator, the top of the connecting frame is connected with the output end of the linear driving mechanism, and the linear driving mechanism can drive the connecting frame to linearly move in the X direction and / or the Y direction. The positioning adjusting device for the neutron diffraction experiment is relatively high in space utilization rate and relatively high in universality.

The invention relates to a method for measuring dendritic crystal orientation deviation of a single crystal blade through monochromatic neutron diffraction imaging, which accurately captures crystal structure information through neutron diffraction, can clearly obtain diffraction signals of different areas of the single crystal blade, and can accurately measure the orientation deviation of defective crystal grains through the steps of defect position determination, bright spot matching and the like. By utilizing the deep penetrability and volatility of neutrons, the interior of the blade can be detected under the condition that the single crystal blade is not damaged. Meanwhile, the neutron imaging detection range is larger than that of a traditional X-ray method, overall imaging of the single crystal blade can be achieved, operation such as data cutting and splicing is not needed, the result is more visual and accurate, and consumed time is shorter.

The invention relates to the technical field of processing, in particular to a low-temperature in-situ neutron diffraction residual stress measuring device for a large-size workpiece. Comprising a sample heat preservation cavity and a liquid nitrogen spraying assembly, the sample heat preservation cavity is provided with an incident light path, a reflection light path and a diffraction light path, and the incident light path, the reflection light path and the diffraction light path are each provided with a light path window; the liquid nitrogen spraying assembly is arranged in the cavity and is used for spraying liquid nitrogen to the sample to be detected. Liquid nitrogen is sprayed to a to-be-detected sample through the liquid nitrogen spraying assembly, rapid cooling of a large-size workpiece can be achieved, accurate temperature control can be achieved, and the problem that in-situ detection of the large-size workpiece is difficult is particularly solved; the in-situ detection of the neutron diffraction residual stress of the large-size workpiece in the temperature zone range of-196 DEG C to + 200 DEG C is realized, and the residual stress evolution law of the residual stress of the workpiece in the temperature rising and falling process and the heat preservation process at different temperatures can be obtained, so that the residual stress evolution law is closer to the actual situation, and effective guidance is provided for the formulation of a residual stress process.

This invention belongs to the field of materials science and engineering, and relates to an NS-TNV40 neutron-transparent alloy for high-temperature neutron scattering experiments. The alloy's composition, by weight percentage, is 39.24% Ti, 39.24% Nb, and 21.52% V. Its preparation includes batching, melting, homogenization, and forging. The alloy has a theoretical melting point of 1716℃, exhibits no neutron diffraction peaks after holding at 1000℃ for 100 hours, and demonstrates excellent high-temperature stability. It maintains a single-phase structure without phase transformation after 100 hours of service at 1000℃. It also exhibits good high-temperature oxidation resistance, with oxidation weight gain lower than that of high-purity V and VNi alloys. Mechanically, it combines high strength and high plasticity. This alloy can avoid interference from the scattering signals of the sample container itself, improve the quality of neutron scattering data, meet the requirements of high-temperature in-situ experiments, and promote the development of high-temperature neutron scattering experimental technology.

The invention provides a method and a system for synchronously testing residual stress and hydrogen content. The method comprises the following steps: determining components and crystal structure types of a to-be-tested material; detecting the texture of the to-be-detected material; determining test crystal faces in three directions of the residual stress of the neutron diffraction detection sample, and testing lattice strain in the three directions; carrying out a prompt gamma experiment by using the standard sample to obtain a standard sample activation energy spectrum of neutron-activated prompt gamma; determining a series of to-be-tested positions for synchronously testing the residual stress and the hydrogen content, and further determining a sample table movement parameter corresponding to each measurement position; acquiring neutron diffraction data, testing lattice strain in three directions, and acquiring a signal of instant gamma at the same time; and constructing position corresponding information of neutron diffraction test and neutron activation instant gamma test data, and performing data processing to obtain final residual stress distribution and hydrogen content distribution. According to the detection method, the internal residual stress and the hydrogen content of the material can be simultaneously tested by utilizing a primary neutron diffraction experiment.

The present invention belongs to the technical field of neutron diffraction experiments, and discloses a device for precisely positioning and adjusting the direction of a volume beam in a neutron diffraction experiment. The device comprises a switching platform, a linear drive mechanism, a rotary drive mechanism, and a lifting and lowering adjustment mechanism. The lifting and lowering adjustment mechanism comprises a horizontal adjustment plate, a base plate, and a lifting and lowering adjustment assembly. The rotary drive mechanism is mounted on the horizontal adjustment plate. The lifting and lowering adjustment assembly comprises a support column, an adjustment member, and a locking nut. The support column is fixedly mounted on the base plate. The adjustment member and the locking nut are both threadedly sleeved on the periphery of the support column. The end of the adjustment member facing the horizontal adjustment plate is configured as a spherical body, and the side of the horizontal adjustment plate facing the base plate is provided with a spherical groove adapted to the spherical body. The device for precisely positioning and adjusting the direction of a volume beam in a neutron diffraction experiment of the present invention can adjust the posture of a fine collimator on a switching platform, thereby achieving precise positioning and adjustment of the direction of the experimentally measured volume beam to meet the needs of neutron diffraction experiments.

The invention provides a double-mechanical-arm sample scanning device and method for neutron diffraction stress measurement. The double-mechanical-arm sample scanning device comprises an operation arm, a measurement arm, a control system and a sample disc. The operation arm comprises a first mechanical arm and a clamping jaw, the clamping jaw is used for grabbing a to-be-tested sample from the sample disc, and the first mechanical arm is used for driving the grabbed sample to move in the operation space so as to change the position posture of the sample relative to the neutron beam; the measuring arm comprises a second mechanical arm and a contour measuring sensor, the contour measuring sensor is used for measuring the contour of the sample, and the second mechanical arm is used for adjusting the position posture of the contour measuring sensor; the control system is used for collecting measurement data of the contour measurement sensor, calculating the sample contour and the position posture of the sample relative to the operation arm coordinate system, and controlling the operation arm to drive the sample to perform neutron scanning. Sample movement and rotation positioning in the neutron scanning and measuring process are completed through the mechanical arm, and the flexibility of sample space operation is remarkably improved while the precision is ensured.

This invention discloses a multi-channel collimation device for neutron diffraction, belonging to the technical field of neutron scattering spectrometers. The device includes a base, separating aluminum plates, and a detector. The base has an arc-shaped structure, with two bases arranged opposite each other. Each base has multiple mounting cavities spaced circumferentially on it. Each mounting cavity contains multiple separating aluminum plates spaced vertically, with a channel for the neutron beam to pass between adjacent separating aluminum plates. The detector is configured in a one-to-one correspondence with each channel. This multi-channel collimation device can optimize the neutron signal and reduce stray background signals, thereby ensuring the accuracy of experimental results.

The invention relates to the field of neutron scattering experiment materials, and provides a neutron diffraction peak-free anti-oxidation zero-coherence scattering alloy material with a single-phase BCC structure and suitable for a high-temperature neutron scattering experiment and a preparation method of the neutron diffraction peak-free anti-oxidation zero-coherence scattering alloy material. The alloy contains 37.07% of Ti, 59.95% of Ta and 2.98% of Al, the theoretical melting point is 1867 DEG C, no neutron diffraction peak exists, and the alloy can be used for preparing a sample containing container and a neutron beam window. The TiTaAl alloy has no neutron diffraction peak in an X-ray and neutron diffraction pattern, data interference can be avoided, and the quality of experimental data is improved. The TiZr alloy keeps high strength and high plasticity at a high temperature, and is suitable for a high-temperature experiment environment of 800 DEG C or above. After the material is oxidized for 80 hours in an atmospheric environment of 1000 DEG C, the oxidation weight gain is only 43mg / cm < 2 >, the oxidation resistance is excellent, and the reusability and economical efficiency of the material are improved; according to the method, accurate component control and efficient manufacturing are achieved by optimizing the steps of burdening, smelting, alloying, homogenizing treatment, forging and the like, the problems that an existing process is inaccurate in component control, low in efficiency, high in cost and the like are solved, and the product quality and the production efficiency are improved.

This invention provides an underwater welding stress in-situ measurement device and method based on neutron diffraction. The device includes a wire feeding mechanism, an underwater welding module, a neutron diffraction testing module, a molten pool camera module, and a water supply and drainage system. The underwater welding module includes a welding torch, a robotic arm, and an underwater welding table. The underwater welding table has a welding test chamber. An inclined pressure plate is provided in the welding test chamber. The pressure plate divides the welding test chamber into a water-side chamber and an air-side chamber. The pressure plate is used to press the workpiece. The molten pool camera module is used to acquire welding images. The neutron diffraction testing module includes a neutron incident device and two sets of detectors. The neutron incident device is used to inject a neutron beam into the workpiece test area. The two sets of detectors are respectively set at ±90° positions along the neutron beam diffraction direction. This device can simulate the underwater environment and achieve stable welding, and can acquire stress evolution data of the weld and its surrounding area in real time and continuously during the welding thermal cycle.

The invention discloses a sample positioning method applied to a neutron diffraction spectrometer for measuring residual stress of a material or a workpiece, which is applied to the field of neutron scattering science and technology and comprises the following steps: aligning a to-be-measured point of a to-be-measured sample with cross laser by using an electric displacement table to finish coarse positioning of the to-be-measured sample; measuring equipment is adopted to detect the surface coordinates of the point to be measured, the surface coordinates of the point to be measured are aligned with the beam center coordinates through an electric displacement table, and fine positioning of the sample to be measured is completed; driving the to-be-tested sample to move along the beam direction at a preset step length by using an electric displacement table, recording diffraction intensities of the to-be-tested sample at different positions, and performing deviation compensation through the electric displacement table according to a deviation between a corresponding position of a diffraction intensity peak value and a theoretical position; and repeating the measurement and deviation compensation of the diffracted intensity until the to-be-measured point completely coincides with the beam center and the diffraction centroid. The method effectively improves the positioning accuracy of the to-be-measured sample when the residual stress is measured.

The invention provides a neutron diffraction stress measurement device and method based on space coordinate measurement. The neutron diffraction stress measurement device comprises an autonomous navigation trolley, an attitude adjustment system, a space measurement sensor, a neutron detector, a sample table and a main controller, the attitude adjusting system is fixedly mounted on the autonomous navigation trolley, the neutron detector is detachably mounted on the attitude adjusting system, and the autonomous navigation trolley is used for carrying the neutron detector and the attitude adjusting system to move to a position near a specified position in a measurement space; the space measurement sensor is used for measuring the actual position posture of the neutron detector in a measurement space and sending measurement data to the main controller; the main controller is used for sending a motion instruction, receiving measurement data, executing coordinate transformation operation and kinematics inverse solution operation and outputting a control signal. Through combination of the autonomous navigation trolley, the attitude adjustment system and the space measurement system, accurate positioning of the neutron detector in a neutron measurement space is realized, and a neutron diffraction stress measurement task is completed.

The present invention belongs to the technical field of gear heat treatment, and discloses a rotary kiln large gear heat treatment process optimization system and method; the method comprises: performing normalizing forging twice on a preselected material to obtain a preselected material with refined grains, processing the preselected material with refined grains to obtain a gear, performing vacuum nitriding treatment on the naturally cooled gear to obtain a first gear; performing gradient quenching treatment on the first gear to obtain a second gear; performing carburizing treatment and isothermal tempering treatment on the second gear to obtain a third gear; presetting a scanning range, scanning step length and scanning speed, and collecting X-ray diffraction patterns, neutron diffraction data and eddy current signals on the surface of the third gear; the present invention can effectively eliminate stress, dynamically adjust process parameters such as tempering, so that the heat treatment process is in a precisely controllable state throughout the entire process, and comprehensively improve gear performance.

The invention relates to a neutron diffraction testing device and method for a hydrogen storage material in a liquid hydrogen environment, in particular to the technical field of hydrogen storage material testing, and the neutron diffraction testing device comprises a neutron diffraction testing unit and a liquid hydrogen environment providing unit arranged between radial collimators of the neutron diffraction testing unit; the liquid hydrogen environment providing unit comprises a hydrogen end, a liquid helium end, a liquid hydrogen environment end and a gas recovery end; the hydrogen end is connected with the liquid hydrogen environment end through the heat exchanger; the liquid helium end is connected with a cold medium channel of the heat exchanger; and a hydrogen outlet of the liquid hydrogen environment end is connected with the gas recovery end. According to the neutron diffraction testing device for the hydrogen storage material in the liquid hydrogen environment, provided by the invention, the liquid hydrogen environment unit is introduced into the testing device, so that neutron diffraction testing of the hydrogen storage material in the dynamic hydrogen absorption / desorption or service process in the liquid hydrogen environment is realized, and crystal structure evolution information and related information such as material stress and strain are obtained; therefore, the performance characterization accuracy of the hydrogen storage material is improved.

The invention provides a three-dimensional neutron diffraction orientation and strain field reconstruction method, system, medium and equipment, and the method comprises the steps: S1, according to a three-dimensional neutron diffraction technology principle, continuously rotating an Euler ring rotation angle to scan a material sample, and obtaining three-dimensional diffraction data; wherein the coordinates are detector coordinates and Euler ring rotation angles; s2, determining a two-dimensional rocking curve plane based on the three-dimensional diffraction data, discretizing the two-dimensional rocking curve plane to obtain a discretized angle unit, and taking the center of the angle unit as representative orientation; s3, obtaining a diffraction peak curve through in-plane integration for the discretized angle unit, fitting by using a pseudo Volight model to obtain a peak position parameter, calculating the interplanar spacing in the discrete unit based on the peak position parameter, and calculating the lattice strain in the discrete unit based on the interplanar spacing in the discrete unit; and S4, reconstructing a segmented constant orientation field and a strain field by taking all angle units as pixel grids.

The present invention discloses a neutron diffraction device for residual stress detection in a metal additive manufacturing process, comprising a detection mechanism, which includes a neutron beam generating device and a plurality of diffraction detection devices. The neutron beam generating device is used to emit an incident neutron beam, and the diffraction detection device is located on the side of the incident neutron beam. The incident neutron beam irradiates the workpiece and diffracts to generate a plurality of outgoing neutron beams perpendicular to the incident neutron beam, and the diffraction detection device receives the outgoing neutron beam. The detection mechanism is provided with a plurality of diffraction detection array devices. Each detection array can simultaneously collect diffraction data of a plurality of diffraction peaks through the time-of-flight method, providing a data basis for multi-peak full spectrum analysis. The analysis data can also obtain lattice strain, phase change, and organizational structure information of different crystal planes.

The present invention relates to a positive electrode active material for a lithium ion secondary battery, which contains a lithium-nickel composite oxide having a hexagonal layered structure, and which is characterized in that the lithium-nickel composite oxide has a mass ratio of Li: Ni: M = a: b: c (0.90 < = a < 1.00, 0.80 < = b < 1.00, 0.00 < c < = 0.20, and b + c = 1), and in that the mass ratio of Li: Ni: M = a: b: c (0.90 < = a < 1.00, 0.80 < = b < 1.00, 0.00 < c < = 0.20, and b + c = 1); the element M is at least one element selected from the group consisting of Mn, Co, Al, Ti, Zr, W, Fe, Si, Nb, Mg, Ca, B, Na, K, Mo, Cu, V, P, and Ba), the occupancy of nickel present in the lithium site obtained by a powder neutron diffraction pattern is 2.5%-10.0%, and the half-value width of the diffraction peak of the (003) plane in a powder X-ray diffraction pattern is 0.054 DEG or more and less than 0.074 DEG.

The present invention discloses a large-scale component residual stress testing platform and test method based on neutron diffraction. The test platform includes a component support, a rotating spindle, a first thrust cylindrical roller bearing, a first cylindrical roller bearing, a bearing clearance cylinder, a second cylindrical roller bearing, a sleeve, and a first fixed baffle, which are arranged on a neutron spectrometer sample stage. The component support is fixedly mounted on the neutron spectrometer sample stage, and the rotating spindle is mounted on the component support via a fixed spindle and a second fixed baffle. The first thrust cylindrical roller bearing, the first cylindrical roller bearing, the bearing clearance cylinder, and the second cylindrical roller bearing are sequentially mounted on the rotating spindle from the inside out. The sleeve is mounted on the outside of the first cylindrical roller bearing, the bearing clearance cylinder, and the second cylindrical roller bearing. The large component is mounted on the sleeve, and the first fixed baffle is used to laterally limit the large component. The present invention can achieve the support, movement, rotation, tilting, and rotation of large components during residual stress testing.

The application provides a complex magnetic structure step-by-step approximation refining method based on neutron diffraction, which is suitable for scientific instrument and material research industry, mainly aims at research and development, performance evaluation and quality control of new magnetic materials, realizes high-precision analysis of complex magnetic structure (including magnetic moment size and arrangement direction) by providing a systematic step-by-step approximation refining strategy, and provides an important experimental characterization method and means for basic research and industrial application of magnetic materials, and more specifically, aims at improving the reliability and efficiency of complex magnetic structure analysis through systematic step design and improved optimization algorithm, including data acquisition and preliminary analysis, basic model construction, step-by-step approximation refining strategy, model complication and final refining result confirmation. The application is expected to provide a more solid experimental basis for the research of complex magnetic materials and promote the further development of the field of magnetic material science.

The present invention belongs to the technical field of residual stress detection, and in particular relates to a neutron diffraction test fixture and method for deep residual stress of large-scale annular cylindrical parts; wherein the test fixture is composed of a fixed base plate, a pressure roller and multiple pairs of support roller groups, the multiple pairs of support roller groups are arranged at intervals along the axial direction of the annular cylindrical part, the pressure roller is arranged inside the annular cylindrical part along the axial direction, and the two ends of the pressure roller are respectively fixedly connected to the neutron stress spectrometer sample platform. The test method is: before the test, the test blind areas in all directions of the annular cylindrical part and the test blind spots on the blind areas are determined, the non-test blind spots are tested, and then the test blind spots are tested by the rotation offset and drilling auxiliary method innovatively proposed by the present invention. The test fixture has a simple structure and is easy to process. It can achieve stable fixation of the annular cylindrical part and rapid switching of axial strain test points, improve test efficiency, and save precious neutron beam time. The test method solves the problem that the deep residual stress of the annular cylindrical part cannot be measured.

The present invention provides a method and system for reconstructing the strain field of a neutron diffraction experiment based on a Gaussian mixture model, comprising: step S1: establishing a diffraction geometry relationship that takes into account the diffraction volume; step S2: using the diffraction image to obtain a probabilistic sampling model corresponding to the diffraction geometry; step S3: using the sampling model, using the Gaussian mixture model to separate the diffraction images corresponding to different crystal plane orientations; step S4: solving the diffraction angle, orientation normal, and volume fraction corresponding to each crystal plane in the material; and step S5: solving the mean strain corresponding to each point in the diffraction volume to reconstruct the strain field information corresponding to a single diffraction measurement. The present invention proposes a method for reconstructing the strain field of a neutron diffraction experiment based on a Gaussian mixture model, which can conveniently, efficiently, and accurately establish the relationship between the neutron diffraction image and the strain field. The present invention does not require dimensionality reduction and compression of the original experimental data, and does not need to ignore information such as the diffraction volume and texture intensity to study the strain field.

The present invention relates to the technical field of residual stress diffraction testing, and more specifically, to a method for measuring residual stress in complex materials using diffraction technology. The present invention only requires measuring the strain of the matrix phase to obtain the overall stress of the material. The specific steps are: first, obtaining the average bulk modulus #imgabs0# and average shear modulus #imgabs1# of the complex material to be tested; then, using a micromechanical model, calculating the diffraction elastic constants of specific crystal planes of the matrix phase of the complex material; and then, through X-ray or neutron diffraction measurements of the matrix phase strain of the complex material and calculation of the stress of the complex material, the overall stress of the material can be determined. The present invention provides simple testing and highly reliable results.

This invention relates to the field of neutron scattering experimental materials, proposing a neutron-diffraction-resistant, oxidation-resistant, zero-coherence scattering alloy material with a single-phase BCC structure suitable for high-temperature neutron scattering experiments, and its preparation method. This alloy contains 37.07% Ti, 59.95% Ta, and 2.98% Al, with a theoretical melting point of 1867℃. It exhibits no neutron diffraction peaks and can be used to prepare sample containers and neutron beam windows. The TiTaAl alloy shows no neutron diffraction peaks in X-ray and neutron diffraction patterns, avoiding data interference and improving experimental data quality. Its theoretical melting point is higher than existing TiZr alloys, and it maintains high strength and high ductility at high temperatures, making it suitable for high-temperature experimental environments above 800℃. After oxidation for 80 hours at 1000℃ in an atmospheric environment, the oxidation weight gain is only 43 mg / cm³. 2 It exhibits excellent antioxidant properties, improving the reusability and economy of materials. This invention achieves precise composition control and efficient manufacturing by optimizing steps such as batching, smelting, alloying, homogenization, and forging, solving problems such as inaccurate composition control, low efficiency, and high cost in existing processes, thereby improving product quality and production efficiency.

The present invention relates to the field of battery testing technology, and more specifically to an all-solid-state lithium ion in-situ testing device suitable for neutron diffraction experiments and a method for using the same. The all-solid-state lithium ion in-situ testing device comprises a sample device, a temperature control system, a charge-discharge system, and a detector device. The temperature control system is located at the top and bottom of the sample device, the charge-discharge system is connected to the sample device via leads, and the detector device is located around the sample device. The all-solid-state lithium ion in-situ testing device of the present invention can perform in-situ neutron diffraction experiments on all-solid-state lithium ion batteries under the conditions of an applied temperature field, an electrochemical field, and a vacuum environment. It also has the advantages of locating sample positions, conveniently replacing positive and negative electrodes, and adapting to samples of different sizes.

The application provides a neutron diffraction stress measurement device and method based on spatial coordinate measurement, comprising: an autonomous navigation trolley, a posture adjustment system, a spatial measurement sensor, a neutron detector, a sample table and a main controller; the posture adjustment system is fixedly installed on the autonomous navigation trolley, the neutron detector is detachably installed on the posture adjustment system, the autonomous navigation trolley is used for carrying the neutron detector and the posture adjustment system to move to a position near a specified position in a measurement space; the spatial measurement sensor is used for measuring the actual position and posture of the neutron detector in the measurement space and sending measurement data to the main controller; the main controller is used for sending motion instructions, receiving measurement data, performing coordinate transformation operation and kinematics inverse solution operation and outputting control signals. The application realizes accurate positioning of the neutron detector in the neutron measurement space by combining the autonomous navigation trolley, the posture adjustment system and the spatial measurement system, and completes the neutron diffraction stress measurement task.

The present invention relates to the field of battery testing technology, and more particularly to a method for using an all-solid-state lithium ion in-situ testing device suitable for neutron diffraction experiments. In a temperature control system, the material of components in contact with positive and negative electrodes is titanium-zirconium alloy, because titanium-zirconium alloy has no diffraction peaks for neutron diffraction. At the same time, glass fiber is used for the insulation treatment of the positive and negative electrodes and the titanium-zirconium alloy battery casing. After neutron diffraction, the glass fiber produces a tiny, chaotic neutron diffraction background, which has almost no effect on the regular neutron diffraction signals generated by the positive and negative electrodes. This is crucial for obtaining the neutron diffraction peaks of the positive and negative electrodes and does not affect their signals. In addition, although the components not in direct contact have influencing materials, they are covered with a shielding device - boron nitride on the periphery. In this way, neutrons incident in this direction will be absorbed by the boron nitride and will not produce diffraction signals on the relevant materials.

The invention provides a neutron diffraction texture measurement method and system based on adaptive angle sampling, and the method achieves the synchronous improvement of the coverage integrity of a pole figure and the measurement efficiency through the adaptive optimization of an Euler ring scanning angle. The method comprises the following steps: dynamically adjusting an angle sampling step length to reduce Debye ring segment overlapping as much as possible on the premise of ensuring non-interval coverage of a pole figure based on the constraint of a detector on the coverage range of a polar angle and the resolution capability of an instrument at different geometric positions, and further adaptively amplifying the angle step lengths corresponding to different polar angle ring bands according to a rule on the basis; therefore, super-resolution oversampling of the central area of the pole figure is avoided.

This invention provides a method and system for simultaneous neutron diffraction detection of texture and stress, comprising: Step 1: obtaining the crystal structure type of each phase and the number of pole figures and crystal planes required for neutron diffraction detection of texture; Step 2: performing neutron diffraction detection to obtain material texture information; Step 3: obtaining the texture component to be tested and the crystal plane to be tested, and calculating the specific position of the crystal plane to be tested of the texture component in the corresponding crystal plane pole figure; Step 4: obtaining the crystal plane pole figure of the detected texture, the pole figure scanning range, and the scanning step size; Step 5: acquiring neutron diffraction data; Step 6: calculating the three-dimensional internal stress field of different texture components of the material; Step 7: projecting the obtained neutron diffraction data onto the crystal plane pole figure, and using the symmetry of the crystal structure and mathematical processes to complete it into a complete crystal plane pole figure. This invention significantly reduces the workload of simultaneous texture-stress detection and improves the efficiency of simultaneous texture-stress detection.