Abstract
NiTiCu shape memory alloy undergoes thermomechanical processing which deals with local canning compression followed by annealing at 300, 450 and 600 °C, respectively. In particular, formation of twins is dependent upon size of grains. In the case of annealing at 300 °C, nanocrystalline NiTiCu specimen is fabricated, where a small number of nanotwins are observed and the smaller nanocrystalline grains contributes to suppressing the formation of twins. In addition, twin inheritance effect of NiTiCu shape memory alloy is revealed during thermomechanical processing which deals with local canning compression followed by annealing at 450 and 600 °C, respectively. {112} B2 austenite twin, (001) B19′ martensite twin and (100) B19′ martensite twin are found in NiTiCu specimen annealed at 450 °C. In addition to (001) B19′ martensite twin, {114} B2 austenite twin appears in NiTiCu sample annealed at 600 °C. Formation of {114} twin results from transformation of 201̄ B19′ martensite twin during reverse martensite transformation, whereas formation of {112} twin stems from transformation of {113} B19′ martensite twin during reverse martensite transformation. During subsequent martensite transformation, {114} and {112} twins are so stable that they are unable to be transformed into the corresponding 201̄ and {113} twins.
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