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Microstructure and mechanical properties of Ti-V-Al-Cu shape memory alloy by tailoring Cu content

机译：通过调整Cu含量来制备Ti-V-Al-Cu形状记忆合金的组织和力学性能

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摘要

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 <211> 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.
机译：系统地研究了Ti-V-Al-Cu轻质形状记忆合金的组织，马氏体转变行为，力学性能和形状记忆性能。结果表明，在室温下，固溶处理的Ti-13V-3Al-xCu合金中的相组成逐渐从单一的α-''马氏体相演变为完全的β相，且Cu含量增加。矛状马氏体变体构成了典型的自适应构型，Ti-V-Al-Cu合金中共存有{111）I型孪晶和<211> II型孪晶。此外，在具有较高Cu含量的Ti-V-Al-Cu合金中可以观察到Ti 2 Cu沉淀。 Ti-V-Al-Cu合金的马氏体转变温度随着Cu含量的增加而连续降低。通过调整Cu含量，可以获得具有更高的转变温度和更高的强度以及优异的形状恢复特性的TI-V-Al-Cu合金。它是固溶强化，晶粒细化和沉淀强化以促进基体强度增强的完美结合。在最佳的Ti-13V-3Al-0.5Cu合金中，对于6％的预应变，最大可恢复应变为4.4％，马氏体反向转变温度为334摄氏度。

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