Influence of the martensitic transformation kinetics on the migration of atoms
Keywords:martensitic transformation, kinetics of transformation, pre-martensitic instability, atom migration, diffusion coefficients, radioactive isotopes
The effect of low-temperature martensitic transformations with different kinetics on the diffusion (mass transfer) in a number of alloys is studied using radioactive indicators. It turned out that, under the action of thermoelastic transformations and transformations characterized by isothermal kinetics, there is no increase in the mobility of atoms during the first act of a transformation and the prolonged thermal cycling. In the martensitic transformation with athermal (explosive) kinetics, an abnormally high increase in the mobility of atoms takes place even with one act of the transformation. Various effects on the increase in the diffusion coefficients of multiple transformations, multiple compres sion, and repeatedly repeated simultaneous effects of transformation and deformation are established. The diffusion coefficients in the time moments preceding the transformation are determined.
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