Abstract In the present work, the mechanical and strain recovery characteristics of Ti–V–Al–B shape memory alloy were tailored by changing annealing temperatures. Moreover, effect of annealing temperatures on microstructure and martensitic transformation behavior were investigated systematically. At the annealing temperatures of 650 °C and 700 °C, both α" martensite phase and hard α phase coexisted in the annealed Ti–V–Al–B alloys. With the annealing temperatures increasing, amount of α phase gradually decreased and α" martensite phase was dominated. The reduction of α phase resulted in the compositional variation, which further triggered the rising of transformation temperatures. The elongation of annealed Ti–V–Al–B alloys continuously increased with the annealing temperatures increasing; whereas the yield strength gradually decreased. The mechanical properties were closely related to the amount of α precipitates and dislocations. Under optimum annealing condition of 700 °C, the maximum yield strength of 489 MPa can be achieved in Ti–V–Al–B alloy. Meanwhile, it showed a largest recoverable strain of 4.6% in correspondence to 6% applied pre-strain.

中文翻译：

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热机械处理制备的 Ti-V-Al-B 高温形状记忆合金的显微组织和马氏体转变

摘要 在目前的工作中，通过改变退火温度来调整 Ti-V-Al-B 形状记忆合金的机械和应变恢复特性。此外，系统地研究了退火温度对显微组织和马氏体转变行为的影响。在650℃和700℃的退火温度下，退火后的Ti-V-Al-B合金中α"马氏体相和硬质α相共存。随着退火温度的升高，α相的数量逐渐减少，α"马氏体相占优势。α相的减少导致成分变化，进一步引发转变温度的升高。退火后的 Ti-V-Al-B 合金的伸长率随着退火温度的升高而不断增加；而屈服强度逐渐下降。力学性能与α析出物和位错的数量密切相关。在 700 °C 的最佳退火条件下，Ti-V-Al-B 合金可以达到 489 MPa 的最大屈服强度。同时，它显示了 4.6% 的最大可恢复应变，对应于 6% 的应用预应变。