In-situ neutron diffraction stress and texture composite test method

Abstract

The invention relates to an in-situ neutron diffraction stress and texture composite test method, wherein an in-situ environment loading device, a three-dimensional coordinate adjustment rotation table and a total station positioning system are used, the precise positioning of a specimen and the composite loading of the tilting function, the force load and the temperature field in in-situ test areachieved, and an in-situ neutron diffraction spectrum is collected with a neutron stress spectrometer. According to the in-situ neutron diffraction stress and texture composite test method, a specimen is positioned by using the aligning state of the focal point of a neutron beam, the visual field intersection point of dual total stations and the to-be-tested point of the specimen as basis, and the aligning state of the specimen and the neutron beam spot is precisely adjusted through the three-dimensional translation and rotation of a three-dimensional coordinate adjustment rotation table,; continuous temperature change from room temperature to 1000 DEG C, 0-90 DEG inclination and 360 DEG rotation of the specimen under 0-50 kN tension / compression are achieved with an in-situ environment loading device; and in-situ environment loading device. According to the present invention, the in-situ neutron diffraction stress and texture composite test method is suitable for the composite test ordetection of the neutron stress and texture of crystal materials or small engineering parts under the in-situ force thermal tilting loading.

Description

technical field [0001] The invention belongs to the technical field of testing the microscopic mechanical properties of materials, and in particular relates to an in-situ neutron diffraction stress and texture composite testing method. Background technique [0002] Thanks to the neutron's strong penetrating ability to most materials, neutron diffraction is currently the only experimental method that can non-destructively and deeply obtain information on the internal crystal structure of materials. The neutron stress and texture measurement method developed on the basis of the principle of neutron diffraction can non-destructively obtain information such as three-dimensional stress distribution and crystal orientation distribution inside the sample. Such results are very important for understanding the deformation mechanism, phase transition characteristics and intergranular stress of materials. Behavior such as evolution is decisive. Moreover, the neutron diffraction method...

AI Technical Summary

Problems solved by technology

Neutron sources for diffraction are usually based on large scientific devices such as reactors or accelerators. Special neutron diffraction stress spectrometers are required to carry out stress or texture tests, and in-situ experiments need to be equipped with specially optimized environmental loading devices for the corresponding spectrometers. , so domestic related fields are still blank

On the other hand, at present, in-situ neutron stress and in-situ neutron texture measurements are mostly carried out separately in the world, and the tensile equipment used for in-situ stress measurement does not integrate the tilting function of the specimen, so it is impossible to flexibly select the stress test direction; The Euler ring used in bit texture measurement cannot take into account the mechanical and thermal loading of the specimen, and cannot obtain the evolution information of the texture orientation when the specimen is loaded in tension / compression and temperature field at the same time

The two devices and functions are independent of each other, and the four in-situ degrees of freedom of the sample force-heat-tilt-rotation cannot be directly coupled

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