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Ti-Ni-Hf 고온형상기억합금의 미세조직 및 고온특성에 미치는 합금 조성의 영향
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 ) 대한금속재료학회(구 대한금속학회) 2015 대한금속·재료학회지 Vol.53 No.3
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)