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Vol.53, No.3, 151 ~ 162, 2015
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| Title |
| Effect of Chemical Composition on The Microstructure and High-Temperature Properties of Ti-Ni-Hf High-Temperature Shape Memory Alloys |
| 최성우 Seong Woo Choi , 이학성 Hak Sung Lee , 전영민 Yeong Min Jeon , 남태현 Tae Hyun Nam , 염종택 Jong Taek Yeom , 김성웅 Seong Woong Kim , 박찬희 Chan Hee Park , 홍재근 Jae Keun Hong , 오창석 Chang Seok Oh , 김정한 Jeoung Han Kim |
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| Abstract |
| The effect of Ni and Hf content on the microstructure, phase transformation, and hot workability of Ti-Ni-Hf high-temperature shape memory alloys (SMAs) were investigated. Twelve different Ti-xNi (x=49, 50.2, 50.5, 50.8 at%)-yHf (y=10, 12, 14 at%) SMA ingots were prepared by vacuum arc re-melting, and then analyzed by SEM, DSC, TEM, and XRD after heat treatment. Precipitation behavior was mostly dependent on Ni content rather than Hf content. The effect of homogenization treatment on the particle precipitation and phase transformation behavior was studied. We also found that hot workability was greatly dependent on the solidification structure of the austenite phase. (Received March 2, 2014) |
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| Key Words |
| shape memory alloys, phase transformation, precipitation, homogenization, texture |
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