Journal
PHILOSOPHICAL MAGAZINE LETTERS
Volume 92, Issue 5, Pages 254-261Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/09500839.2012.661886
Keywords
microindentation; Ni-Ti alloy; martensitic transformation; shape memory effect
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A novel, instrumented microindentation technique was successfully used to measure the temperature associated with the martensitic transformation leading to the recovery of plastic strain in a Nickel-Titanium (NiTi) shape memory alloy. Following a standard indentation cycle, the indenter was partially unloaded such that a good contact was maintained between indenter and specimen surface. The onset and finish temperature of the martensitic transformation, the associated volume contraction, and the amount of the recovered plastic deformation were determined by quantifying the indenter displacement as a function of temperature. These experiments were compared to conventional measurements of the transformation temperature by differential scanning calorimetry and compression testing.
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