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1、Ti-Ni 基形状记忆合金相变行为研究基形状记忆合金相变行为研究李小彬 （陕西理工材料科学与工程学院金属材料工程专业 09 级 2 班，汉中 ） 指导教师：贺志荣摘摘 要要 用示差扫描量热仪和光学显微镜分别研究了 350-700 退火态 Ti-50Ni，Ti- 50.1Ni，Ti-45Ni-5Cu，Ti-45Ni-5Cu-0.3Cr 形状记忆合金的相变行为和显微组织；用拉伸试 验研究了 400-600 退火态 Ti-50.8Ni-0.3Cr 形状记忆合金的形变行为。结果表明，随退火 温度 Tan升高，合金的组织从纤维状变成等轴状，再结晶温度在 600 左右。对于 Ti-50Ni 和 Ti-50
2、.1Ni 合金，当 Tan=350-550 时，发生 ARM/MRA 型相变，相变温度比 较稳定；Tan=600-700 时，发生 AM/MA 型相变，相变温度增加；Ti-50Ni 合金的相 变温度高于 Ti-50.1Ni 合金。对于 Ti-45Ni-5Cu 和 Ti-45Ni-5Cu-0.3Cr 合金，当 Tan=350-700时，发生 AM/MA 型相变；随 Tan升高，合金的相变升高；Ti-45Ni-5Cu 合金的 相变温度高于 Ti-45Ni-5Cu-0.3Cr 合金。室温下，400-600 退火态 Ti-50.8Ni-0.3Cr 合金呈 超弹性。400 退火态合金超弹性最稳定，500
3、 退火态合金应力-应变回线面积最大，600 退火态合金的超弹性稳定性最差。 关键词关键词 Ti-Ni 合金；形状记忆合金；显微组织；相变；形变Study on transformation behaviors of Ti-Ni based shape memory alloysLi Xiao-bin (Grade09, Class2, Major of Metallic Materials Engineering, School of Materials Science and Engineering, Shaanxi University of Technology, Hanzhong )
4、Tutor: He Zhi-rongAbstract The transformation behaviors and the microstructure of Ti-50Ni, Ti-50.1Ni, Ti-45Ni- 5Cu and Ti-45Ni-5Cu-0.3Cr shape memory alloys were studied by differential scanning calorimetry and optical microscopy, respectively. The deformation behaviors of Ti-50.8Ni-0.3Cr shape memo
5、ry alloy were investigated by tensile testing. The results show that with increasing annealing temperature Tan, the microstructure of the alloys is change from fibrous to equiaxial grain, and the recrystallization temperature is about 600 . For Ti-50Ni and Ti-50.1Ni alloys, the ARM/MRA type transfor
6、mation occurs when Tan= 350-550 , and the transformation temperatures are stable; the AM/MA type transformation occurs when Tan=600-700 , and the transformation temperatures are increase. The transformation temperature of Ti-50Ni alloy is higher than that of Ti-50.1Ni alloy. For Ti-45Ni-5Cu and Ti-4
7、5Ni-5Cu-0.3Cr alloys, the AM/MA type transformation occurs when Tan= 350-700 , and with increasing Tan, the transformation temperatures are increase. The transformation temperature of Ti-45Ni-5Cu alloy is higher than that of Ti-45Ni-5Cu-0.3Cr alloy. The 400-600 annealed Ti-50.8Ni-0.3Cr alloy shows s
8、uperelasticity at room temperature. The superelasticity is most stable in 400 annealed Ti-50.8Ni-0.3Cr alloy, the loop area is largest in 400 annealed alloy, and superelasticity stable is worst in 600 annealed alloy.Key words Ti-Ni alloy; shape memory alloy; microstructure; transformation; deformati
9、on1.6 本本文文的的研研究究目目的的 用示差扫描量热仪和光学显微镜分别研究 350-700 退火态 Ti-50Ni，Ti-50.1Ni，Ti- 45Ni-5Cu，Ti-45Ni-5Cu-0.3Cr 形状记忆合金的相变行为和显微组织；用拉伸试验研究 400-600 退火态 Ti-50.8Ni-0.3Cr 形状记忆合金的形变行为，为新型 Ti-Ni 基形状记忆合金的 开发与应用提供依据。结论结论(1) Ti-50Ni 合金 350-700 的退火后，随退火温度 Tan升高，合金的组织从纤维状变成 等轴状，再结晶温度在 600 左右。 (2) 对于 Ti-50Ni 和 Ti-50.1Ni 合金，
10、当 Tan=350-550 时，发生 ARM/MRA 型相变，相变温度比较稳定；Tan=600-700 时，发生 AM/MA 型相变，相变 温度增加；Ti-50Ni 合金的相变温度高于 Ti-50.1Ni 合金。 (3) 对于 Ti-45Ni-5Cu 和 Ti-45Ni-5Cu-0.3Cr 合金，当 Tan=350-700时，发生 AM/MA 型相变；随 Tan升高，合金的相变升高；Ti-45Ni-5Cu 合金的相变温度 高于 Ti-45Ni-5Cu-0.3Cr 合金。(4) 室温下，400-600 退火态 Ti-50.8Ni-0.3Cr 合金呈超弹性。400 退火态合金超弹 性最稳定，500
11、 退火态合金应力-应变曲线面积最大，600 退火态合金的塑性最 好，超弹性稳定性最差。内部资料 仅供参考*Jg&6a*CZ7H$dq8KqqfHVZFedswSyXTy#&QA9wkxFyeQ!djs#XuyUP2kNXpRWXmA&UE9aQGn8xp$R#͑GxGjqv$UE9wEwZ#QcUE%&qYpEh5pDx2zVkum&gTXRm6X4NGpP$vSTT#&ksv*3tnGK8!z89AmYWpazadNu#KN&MuWFA5uxY7JnD6YWRrWwcvR9CpbK!zn%Mz849GxGjqv$UE9wEwZ#QcUE%&qYpEh5pDx2zVkum&gTXRm6
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