Effect of Grain Size of Parent Phase on Twinning Modes of B19' Martensite in an Equiatomic Ti-Ni Shape Memory Alloy

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Abstract
The effect of grain size of B2 parent phase on the twinning modes of B19' martensite in a Ti-50.0 at% Ni shape memory alloy has been studied. The grain size of parent phase was controlled from submicrons to several ten microns by cold-rolling and subsequent annealing. (001) compound twins were dominantly observed in the grain less than 4 μm in diameter, although the (001) compound twinning did not give a solution to the phenomenological crystallographic theory. The triangular self-accommodating morphology of the martensite variants consisting of Type II twins which were theoretically and experimentally recognized as a lattice invariant shear of the present transformation appeared in the whole grain more than 4 μm in diameter. The formation mechanism of the (001) compound twinning in the fine grain is also discussed.

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