Stability of thermal cycling and high temperature mechanical properties for Ti–V–Al–B lightweight shape memory alloy |
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| Institution: | 1. College of Nuclear Equipment and Nuclear Engineering, Yantai University, Yantai, 264005, China;2. Shandong Laboratory of Yantai Advanced Materials and Green Manufacturing, Yantai, 264005, China;3. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, China;4. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China |
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| Abstract: | The microstructure of the Ti–V–Al shape memory alloy with refined grain and in-situ TiB phase was modified by doping minor Boron (B), which contributes to the superior mechanical performances and strain recovery characteristics. Compared with other quaternary Ti–V–Al-X alloys, the Ti–V–Al–B alloy showed the largest ultimate tensile stress due to the solution strengthening, grain refinement and precipitation strengthening of in-situ TiB phase. Moreover, the Ti–V–Al alloy added 0.1 ?at.%B possessed the maximum yield stress of 701 ?MPa and the largest tensile fracture strain of 27.6% at the temperature of 150 ?°C. Meanwhile, the excellent strain recovery characteristics with fully recoverable strain of 4% could be obtained due to B addition. Besides, B addition suppressed the precipitation of ω phase during thermal cycling and further improved the thermal cycling stability of the Ti–V–Al alloy. |
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| Keywords: | Shape memory materials Ti–V–Al alloy Microstructure Phase transformation Thermal cycling stability High temperature mechanical properties |
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