Abstract
Pseudoelasticity of shape-memory alloys has been commonly associated with reversible austenite-martensite phase transformation characterized by diffusionless, shear-induced atomic rearrangement. In situ heating nanoindentation and transmission electron microscopy results of this study demonstrate that martensitic TiNi films may also exhibit pseudoelasticity over a specific temperature range due to the reversible movement of the twin boundaries. The nanoscale deformation behavior of martensitic TiNi films was examined over certain ranges of normal load and temperature. The underlying mechanisms of the reversible twin boundary movement and the energy dissipated by pseudoelastic and elastic-plastic deformation in the TiNi films are interpreted in the context of in situ heating nanoindentation responses. The obtained experimental evidence is in agreement with a unified description of pseudoelasticity in which the origin of the restoring force responsible for the pseudoelastic behavior of shape-memory alloys is considered to be the formation of metastable pseudotwins.
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