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Two-Step Martensitic Transformation in an Aged Ti_{50}Ni_{15}Pd_{25}Cu_{10} High Temperature Shape Memory Alloys

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Rehman S., Khan M., Nusair Khan A., Ali L., Imran Jaffery S.
Acta Physica Polonica A
|
2015
|
vol. 128
|
issue 2B
B-125-B-127
EN
Multi-step martensitic transformation in an aged Ni-rich binary NiTi shape memory alloy is considered as usual behavior during transformation from austenite to martensite phase; from (austenite) B2 to R-phase and then R-phase to B19' (monoclinic). However, for equi-atomic NiTi-based quaternary high temperature shape memory alloy, two-step martensitic transformation was detected for the first time. The Ti_{50}Ni_{15}Pd_{25}Cu_{10} high temperature shape memory alloys were investigated for the evolution of transformation temperatures at aging temperature of 550°C and 700°C. Aging at 550°C for 6 h resulted in significant reduction of phase transformation temperatures. During forward transformation from austenite to martensite, two-step martensitic transformation B2 → R and R → B19 (orthorhombic) was observed. By aging the alloy at 700°C for 6 h, no significant effect was found on phase transition behavior and transformation temperatures.
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