Effect of Aging on Phase Transition Behavior of Ti50Ni15Pd25Cu10 High Temperature Shape Memory Alloys

Saif ur Rehman; Mushtaq Khan; Liaqat Ali; Syed Imran Husain Jaffery

doi:10.4028/www.scientific.net/AMR.1101.177

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 1101Effect of Aging on Phase Transition Behavior of...

Effect of Aging on Phase Transition Behavior of Ti₅₀Ni₁₅Pd₂₅Cu₁₀ High Temperature Shape Memory Alloys

Abstract:

Formation of Ni₄Ti₃ precipitates during aging of Ni-rich binary NiTi shape memory alloys and its effect on transition behavior during transformation from austenite to martensite phase has been studied extensively. However for equi-atomic NiTi-based quaternary high temperature shape memory alloy, two-stage martensitic transformation was detected for the first time. The Ti₅₀Ni₁₅Pd₂₅Cu₁₀ high temperature shape memory alloys were investigated for the hardness and transformation temperatures at aging temperature of 550°C. Aging at 550°C for 6 h resulted in remarkable increase in the hardness, whereas the phase transformation temperatures decreased significantly. During forward transformation from austenite to martensite, two-stage martensitic transformation; B2 (cubic) → R-phase and R-phase → B19 (orthorhombic) was observed.

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Advanced Materials Research (Volume 1101)

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177-180

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https://doi.org/10.4028/www.scientific.net/AMR.1101.177

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Online since:

April 2015

Authors:

Saif ur Rehman, Mushtaq Khan, Liaqat Ali, Syed Imran Husain Jaffery

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Aging, Microhardness, Phase Transformation Behavior, Shape Memory Alloys

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