Phase Transformations during Deformation of Fe-Ni and Alloys Produced by Mechanical Alloying

摘要

Compositions of Fe_((100-x))Mn_x (x = 10 and 12 at. percent) and Fe_((100-y))Ni_y, (y = 18 and 20 at. percent) were produced by combined mechanical alloying of pure-metal powders and annealed in the austenitic field. After annealing and cooling to room temperature, the alloys had a single-phase austenitic structure. During deformation, the gamma phase partially transforms into the alpha_2 phase (and/or 8 phase in Fe-Mn alloys). The phase composition of the alloys after deformation depends on the amount of alloying elements and the predeformation annealing regime. The amount of martensite in the structure of a bulk alloy obtained by powder compacting grows proportionally to the degree of deformation of the sample.