Microstructure and mechanical properties of Ti-V-Al-Cu shape memory alloy by tailoring Cu content
Microstructure and mechanical properties of Ti-V-Al-Cu shape memory alloy by tailoring Cu content
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Cu含量调控Ti-V-Al-Cu形状记忆合金的显微组织和力学性能
DOI：
10.1016/j.msea.2019.138641
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发表时间：
2020
期刊：
影响因子：
6.4
通讯作者：
Zhao Liancheng
中科院分区：
文献类型：
--
作者：
Sun Kuishan;Yi Xiaoyang;Sun Bin;Yin Xinghe;Meng Xianglong;Cai Wei;Zhao Liancheng
系统地研究了Ti-V-Al-Cu轻质形状记忆合金的显微组织、马氏体相变行为、力学性能和形状记忆性能。结果表明：室温固溶处理的Ti-13V-3Al-xCu合金，随着Cu含量的增加，相组成逐渐由单一的α“马氏体相演变为完整的β相；在Ti-V-Al-Cu合金中，矛状马氏体变体构成了典型的自调节结构，{111)I型孪晶和II型孪晶并存。Cu含量较高的Ti-V-Al-Cu合金中有Ti2Cu析出。随着Cu含量的增加，Ti-V-Al-Cu合金的马氏体相变温度不断降低。通过调整Cu含量，可以得到相变温度高、强度高、形状恢复性能好的TI-V-Al-Cu合金。是固溶强化、晶粒细化和析出强化的完美结合，促进了基体强度的提高。最佳Ti-13V-3Al-0.5Cu合金的最大可恢复应变为4.4%，预应变为6%，反马氏体转变温度为334℃。
The microstructure, martensitic transformation behavior, mechanical and shape memory properties of the Ti-V-Al-Cu light weight shape memory alloys were investigated systematically. The results showed that the phase constitution gradually evolved from single alpha '' martensite phase to the complete beta phase with the Cu content increasing in the solution treated Ti-13V-3Al-xCu alloys at room temperature. The spear-like martensite variant constituted the typical self-accommodation configuration, and {111) type I twins and type II twins coexisted in the Ti-V-Al-Cu alloys. Moreover, Ti2Cu precipitate can be observed in the Ti-V-Al-Cu alloys with the higher Cu contents. The martensitic transformation temperature of Ti-V-Al-Cu alloys decreased continuously with the increased Cu content. The TI-V-Al-Cu alloys with the higher transformation temperature and higher strength as well as the superior shape recovery characteristics can be obtained by tailoring Cu content. It was the perfect combination of solid solution strengthening, grain refinement and precipitation strengthening to promote the enhancement of matrix strength. The maximum recoverable strain was 4.4%, for 6% pre-strain and the reverse martensite transformation temperature was 334 degrees C in the optimal Ti-13V-3Al-0.5Cu alloy.