用光学显微镜、示差扫描热分析仪、X射线衍射仪及拉伸试验研究了Ti-49.8Ni-1.0Co(at%)形状记忆合金组织、相变和力学性能.结果表明,400 ℃和600 ℃退火态合金的组织分别呈纤维状和等轴状,且冷却和加热时分别发生A(←→)R(←→)M两阶段和A(←→)M一阶段相变.400 ℃退火态合金的马氏体相变热滞大于600℃退火态.退火时间ta对该合金相变类型影响不大,但随ta延长,合金的相变温度升高.室温下,400 ℃和600 ℃退火态合金呈形状记忆效应(SME)+超弹性(SE),600 ℃退火态合金的应力诱发马氏体临界应力和塑性高于400 ℃退火态.随ta延长合金的应力诱发马氏体应力降低.当试验温度Td≤20 ℃时合金呈SME+SE,当Tb≥30 ℃时呈SE.随Td升高,合金的应力-应变滞回面积减小,SE特性增强.
参考文献
[1] | Otsuka K;Wayman C M.Shape Memory Materials[M].Cambridge:Cambridge University Press,1998:50-68. |
[2] | 赵连城;蔡伟;郑玉峰.合金的形状记忆效应与超弹性[M].北京:国防工业出版社,2002:15-290. |
[3] | 徐祖耀;江伯鸿.形状记忆合金材料[M].上海:上海交通大学出版社,2000:24-38. |
[4] | 舟久保;熙康;千东范.形状记忆合金[M].北京:机械工业出版社,1992:164-182. |
[5] | 贺志荣,张永宏,王永善,周敬恩.Ti49.4Ni50.6超弹性弹簧的相变和形变特性[J].金属学报,2004(01):46-50. |
[6] | 贺志荣.Ti-50.8Ni-0.3Cr超弹性合金的相变与形变特性[J].金属学报,2008(09):1076-1080. |
[7] | Hosoda H;Wakashima K;Miyazaki S et al.Factors for controlling martensitic transformation temperature of TiNi shape memory alloy by addition of ternary elements[J].Materials Research Society Symposium Proceedings,2005,842:353-358. |
[8] | Mi-Seon Choi;Jumpei Ogawa;Takashi Fukuda;Tomoyuki Kakeshita .Stability of the B2-type structure and R-phase transformation behavior of Fe or Co doped Ti-Ni alloys[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2006(1/2):527-530. |
[9] | 蔡继峰,贺志荣,付蕾,刘艳.Ti-49.8Ni形状记忆合金的氧化、相变和形变特性[J].金属热处理,2009(06):63-67. |
[10] | Y. Kishi;Z. Yajima;K. Shimizu;K. Morii .Aging effect on transformation characteristics and tensile properties of a Ti-Ni-Co alloy[J].Journal de Physique.IV,2001(8):101-105. |
[11] | Toshikazu Akahori;Mitsuo Niinomi;Tatsuya Higuchi .Microstructures and Mechanical Properties of Ti-Ni and Ti-Ni-Co Type Shape Memory Alloys[J].日本金属学会誌,2003(10):595-603. |
[12] | 贺志荣,王芳.热处理对Ti-49.8Ni-1.0Co超弹性合金相变行为的影响[J].金属学报,2008(01):23-28. |
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