Abstract
NiTi shape memory alloys show a martensitic phase transformation from a cubic high temperature phase (B2 austenite) to a monoclinic structure (B19′ martensite). A crystalline to amorphous phase transformation can be obtained by methods of severe plastic deformation such as cold rolling and high pressure torsion (HPT) [1]. Deformation at a temperature below the martensitic finish temperature (Mf) promotes the amorphization [2]. A NiTi alloy and a NiTiHf alloy that are martensitic at room temperature (RT) but have different values of Mf (∼30 and 110°C, resp.) were subjected to HPT at RT and analysed by transmission electron microscopy (TEM).
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