A Study of TiNiV Ternary Shape Memory Alloys

• Main Authors: Jang, Shun-Kueir, 張順奎
• Other Authors: Lin Kum-Ming, Lin Hsin-Chih
• Format: Others
• Language: zh-TW
• Published: 1997
• Online Access: http://ndltd.ncl.edu.tw/handle/61003649556493117846

碩士 === 逢甲大學 === 材料科學研究所 === 85 === The TiNiV ternary shape memory alloys are investigated with focusing on their basic characteristics and the effects of thermal-mechanical treatment on theirshape memory effect and transformation behaviors. The experimental results reveal that the transformaton temperatures will dropdown about 10℃ and the hardness will increase about 20Hv by adding 1~2at%V At the same time, the SME property is improved. However in addition of 3~4at%Vthe hardness will decrease a little and the M* will raise to around room temperature. The second phase existing in the matrix will depress the SME property with inhibiting the self-accomdation of martensite. Meanwhile, the second phase will also reduce the property of cold work if the conceration of V exceeds 3at%. The weight loss of TiNiV alloys increase with increasing sliding distance and wear load in the wear test.After 22% cold-rolling , the M* temperature of TiNiV alloy is depressed to below -100℃. After annealling process at 400℃ and 500℃, there is residual dislocations in the TiNiV alloys and the M* temperature is still very low. As the annealing temperature riases to 600℃, the M* temperature and hardness will recover to the original values before cold rolling. The transformation temperatures of TiNiV alloys will decrease with incresing thermal cycles.