A Measuring Method of Interdiffusion Coefficient Eliminating the Effect of Cooling Process

Abstract

The invention discloses a mutual diffusion coefficient measurement method able to eliminate cooling process influence. The method is characterized by being carried out according to the steps of: 1. utilizing mutual diffusion equipment to conduct isothermal diffusion experiment on a one-dimensional semi-infinite diffusion couple of an alloy melt to obtain a component spectrum; 2. acquiring a mutual diffusion coefficient of the one-dimensional semi-infinite diffusion couple; 3. acquiring the diffusion length of the one-dimensional semi-infinite diffusion couple; and 4. acquiring the mutual diffusion coefficient and diffusion length of the one-dimensional semi-infinite diffusion couple in an isothermal diffusion process. On the basis of an easily operable sliding shearing technology, the method provided by the invention can accurately and reasonably eliminate the cooling process diffusion influence, and enhance the measurement precision of mutual diffusion experiment so as to obtain accurate mutual diffusion data, thereby making a contribution to establishment of an alloy melt mutual diffusion database, development of related alloy melt field and design and application of metal materials.

Description

technical field [0001] The invention relates to the field of interdiffusion of alloy melts, in particular to a method for eliminating the diffusion in the cooling process by utilizing the dependence of diffusion length with time, obtaining the interdiffusion coefficient and improving the measurement accuracy of the interdiffusion coefficient. Background technique [0002] Diffusion, as an important kinetic phenomenon in the alloy melt, has a significant impact on many mass transfer processes in the melt. For example, in the solidification and crystallization process of the melt, the size of the solute diffusion coefficient directly determines the composition distribution of the solidified structure, Growth pattern and microscopic morphology. Although the alloy melt is generally 2 to 3 orders of magnitude faster than the diffusion of solid alloys, it is very slow compared with the chemical reaction rate. Therefore, the diffusion of the melt is often an important limiting fact...

AI Technical Summary

Problems solved by technology

For the accurate measurement of the cell-cutting method, due to the complex structure and cumbersome operation, it is impossible to conduct a large number of interdiffusion experiments

On the basis of the traditional long capillary method and tangential element method, the research group independently developed the equipment for interdiffusion measurement of alloy melt and the corresponding sliding shear method. Compared with the traditional long capillary method, it can effectively avoid The effect of diffusion during the heating process, so the error is significantly reduced and the measurement accuracy is higher; at the same time, compared with the tangential element method, its equipment is simple to operate and low in cost, so it is conducive to a large number of interdiffusion measurements, but the effect on the diffusion of the cooling process but can not avoid

Images