7 results about "Equilibrium phase" patented technology

The application discloses a strain-induced supersaturated solid solution analysis method for a non-miscible alloy system based on mixed entropy evolution, and the method comprises the following steps: for a target A-B binary alloy, a mixed entropy-component relationship diagram of the target A-B binary alloy is drawn; the average component and the initial equilibrium phase component point of the target A-B binary alloy are calibrated in the diagram; based on the increase of the mixed degree of the entropy generation driving force, the two-phase components are predicted to evolve in the entropy increase direction during a severe plastic deformation process, until a single-phase supersaturated solid solution is formed. Based on the irreversible thermodynamic principle, the severe plastic deformation process is defined as a continuous external entropy generation source for driving the evolution of the system, through the analysis of the dynamic competition mechanism of element mixing and element demixing dominated by the entropy generation source, the formation mechanism of the supersaturated solid solution is revealed, and the application provides a universal theoretical tool for understanding and predicting the supersaturated solid solution behavior of the non-miscible alloy system under the severe plastic deformation.

The application discloses a method for predicting non-equilibrium phase transition relaxation time by considering the influence of pressure drop rate, and relates to the technical field of oil and gas reservoir exploitation; by constructing a non-equilibrium characteristic parameter model and introducing a dynamic relaxation time model of the influence of pressure drop rate, the application quantitatively represents the non-equilibrium phase state characteristic parameters of the system under different pressure drop rates, and expresses the process that the non-equilibrium phase state characteristic parameters of the system gradually recover from the initial non-equilibrium state to the equilibrium state with the change of pressure; the limitation problem that the traditional model is only based on time or assumes instantaneous equilibrium is solved, and the dynamic process that the gas-liquid two phases deviate from the equilibrium and gradually recover in the rapid pressure drop process can be truly reflected; the established phase state characteristic parameter recovery model is in an analytical form, and is convenient for direct application in engineering calculation such as PVT phase state analysis and gas injection simulation, and is particularly suitable for condensate gas reservoirs, volatile oil reservoirs, gas injection systems and other complex systems with non-equilibrium phase transition behaviors.

The invention relates to a two-component system gas-liquid equilibrium phase diagram in-situ testing device which comprises a gas-liquid equilibrium kettle, a gas-phase quantitative sampling assembly, a liquid-phase sampler, a thermostat and a gas chromatograph, the gas-liquid equilibrium kettle and the gas-phase quantitative sampling assembly are both arranged in the thermostat, the liquid-phase sampler can be inserted into the gas-liquid equilibrium kettle through a liquid-phase sampling opening so as to suck a liquid-phase sample, and the gas-phase quantitative sampling assembly is arranged in the thermostat. The gas chromatograph is connected with the gas phase quantitative sampling assembly through the carrier gas system, and the gas phase quantitative sampling assembly comprises a quantitative loop pipe, a first four-way valve, a second four-way valve and a balloon. The device has the advantages that in-situ sampling is carried out on the gas phase, the phase number in the system is not changed, and the limitation that the theoretical accuracy is influenced by gas phase condensation of an original device is broken through; the volume of the quantitative loop pipe is relatively small, gas-liquid balance in the system cannot be influenced by sampling, and the experiment accuracy is high; the method meets the requirement of phase law, enables the experiment to accord with the physical and chemical basic theory, provides an important reference for the reasonability and correctness of the experiment, and is of great significance for experiment teaching and academic research.

This invention discloses a theoretical design method and its application for improving the chromium diffusion rate of alloys by adding rare earth elements. The theoretical design method includes: classifying rare earth elements according to their differences in properties and selecting specific elements; constructing phase diagram thermodynamic data for the Cr-C-X-RE system based on phase diagram calculation methods, at least calculating the equilibrium phase diagram and the Gibbs free energy curves of the liquid phase, face-centered cubic phase, and first carbide phase for initial screening; calculating the changes in the diffusion barrier and diffusion coefficient of Cr and C elements before and after RE treatment using first-principles calculations; simulating the influence of rare earth elements on the stability of the oxide film on the substrate surface using molecular dynamics simulations; and confirming the rare earth elements based on the changes and influence patterns. By using the integrated computational materials engineering design approach of this invention to screen reasonable rare earth elements, the goal of prioritizing theoretical design can be achieved, resulting in time and cost savings.

The invention relates to a three-dimensional non-equilibrium phase change calculation method suitable for a small break water loss accident. The three-dimensional non-equilibrium phase change calculation method comprises the steps that S1, an idealized rigid heat insulation pipeline model containing an equivalent break structure is constructed; s2, constructing a Lee model with a relaxation time correction term, a Zwart--Gerber--Belamri model, an interface heat transfer model, an interphase acting force model and a turbulence model, and obtaining an interphase source term through the models; s3, establishing a double-fluid control equation, and realizing mass, momentum and energy coupling between a gas phase and a liquid phase through an interphase source item; s4, establishing a thermophysical parameter dynamic mapping mechanism based on IAPWS-IF97 industrial water and water vapor thermodynamic property standards, dynamically obtaining thermophysical parameters of a gas phase and a liquid phase, and feeding back the thermophysical parameters to the step S2 and the step S3; and S5, carrying out numerical discretization and solution on the double-fluid control equation to obtain a response rule of unbalanced phase change under different crevasse sizes. According to the method, the simulation precision of the two-phase flow phase change problem under the high transient and unbalanced background is effectively improved.

The invention relates to the technical field of chemical detection, in particular to a method for drawing a gas-liquid equilibrium phase diagram of a completely mutually soluble two-liquid system. The drawing method comprises the following steps: establishing an absorbance-ethanol volume fraction standard curve; preparing a target double-liquid system and realizing gas-liquid balance; measuring the absorbance and converting the composition; and drawing a phase diagram. The invention provides a bromophenol blue-based spectrophotometric method to replace a refractive index method, the method is suitable for a double-liquid system with one liquid being ethanol, and by utilizing the light absorption specificity of bromophenol blue to ethanol, when the ethanol content is changed, the absorbance of the double-liquid system at a specific wavelength is changed along with the increase of the ethanol content, and the ethanol content can be converted from the absorbance. The testing method is large in absorbance change range and high in sensitivity, and manual adjustment and manual reading are not needed. According to the method, the drawing precision and accuracy of the two-liquid system gas-liquid equilibrium phase diagram can be improved, and the selection range of the two-liquid system for drawing the phase diagram is widened.

This invention relates to a rapid heat treatment method for eliminating discontinuous temperature gradients in Al-Mg alloys, belonging to the field of aluminum alloy heat treatment. This invention involves rapidly eliminating insoluble phases in Al-Mg alloys from room temperature at a temperature gradient of V... a The rate of increase rises to temperature point T A Reaching temperature point T A Later with V b The rate of increase rises to temperature point T B Reaching temperature point T B Later with V c The rate of increase rises to temperature point T C Reaching temperature point T C Then air cooling is performed; temperature point T A Temperature point T B and temperature point T C Based on the non-equilibrium phase diagram of Al-Mg alloys, the temperature point T is determined. A The selected temperature is within the range of 0–50°C above the precipitation start temperature of the low-melting-point second phase in the non-equilibrium phase diagram of the Al-Mg alloy. Temperature T is defined as... B Select a temperature within the range of 0–50°C above the intermediate melting point and the precipitation start temperature of the second phase in the non-equilibrium phase diagram of Al-Mg alloys. Temperature T is chosen as this temperature point. C The temperature range selected is within ±10℃ of the precipitation start temperature of the high-melting-point second phase in the non-equilibrium phase diagram of Al-Mg alloys. This invention employs a variable-speed, discontinuous temperature gradient homogenization heat treatment, which effectively dissolves the insoluble phase.