微量Sc掺杂Ti-V-Al合金马氏体相变与形状记忆效应
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摘要
采用光学显微镜,X射线衍射仪,差示扫描量热仪以及拉伸测试等手段对Sc掺杂Ti-V-Al高温形状记忆合金的马氏体相变,组织结构以及力学性能和形状记忆效应进行表征。结果表明:含有微量Sc掺杂的Ti-V-Al合金室温下均为正交α″马氏体相;微量Sc掺杂,使Ti-V-Al合金的晶粒尺寸稍微细化;随着Sc含量的增加,相变温度持续升高;基于晶粒的细化,Ti-V-Al合金的伸长率得以提高;并且,Sc的添加使形状记忆效应提高了0. 5%。
The martensite transformation,microstructure as well as the mechanical properties and shape memory effect of the Ti-V-Al high temperature shape memory alloy doping minor Sc were characterized by means of optical microscope,X-ray diffraction,differential scanning calorimeter and tensile testing. The results show that the Ti-V-Al alloys contained minor Sc can be indexed as α″ martensite with a orthorhombic structure at room temperature; minor Sc addition can result in the refined grain size; the transformation temperature increases continuously with the increase of Sc content; the elongation of Ti-V-Al alloy is improved owing to the refined grain size,besides,the shape memory effect strain is enhanced by 0. 5% as a result of Sc addition.
The martensite transformation,microstructure as well as the mechanical properties and shape memory effect of the Ti-V-Al high temperature shape memory alloy doping minor Sc were characterized by means of optical microscope,X-ray diffraction,differential scanning calorimeter and tensile testing. The results show that the Ti-V-Al alloys contained minor Sc can be indexed as α″ martensite with a orthorhombic structure at room temperature; minor Sc addition can result in the refined grain size; the transformation temperature increases continuously with the increase of Sc content; the elongation of Ti-V-Al alloy is improved owing to the refined grain size,besides,the shape memory effect strain is enhanced by 0. 5% as a result of Sc addition.
引文
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[4]Zheng X H,Sui J H,Zhang X,et al.Thermal stability and hightemperature shape memory effect of Ti-Ta-Zr alloy[J].Scripta Materialia,2013,68(12):1008-1011.
[5]Meng X L,Sun B,Sun J Y,et al.Microstructure and shape memory behavior of Ti-Nb shape memory alloy thin film[J].Shape Memory and Superelasticity,2017(2):1-8.
[6]Hiroaki Matsumoto,Hiroshi Yoneda,Damien Fabregue,et al.Mechanical behaviors of Ti-V-(Al,Sn)alloys withα'martensite microstructure[J].Journal of Alloys and Compounds,2011,509(6):2684-2692.
[7]Yang Z Y,Zheng X H,Cai W.Martensitic transformation and shape memory effect of Ti-V-Al lightweight high-temperature shape memory alloys[J].Scripta Materialia,2015,99:97-100.
[8]Yang Z Y,Zheng X H,Wu Y,et al.Martensitic transformation and shape memory behavior of Ti-V-Al-Fe lightweight shape memory alloys[J].Journal of Alloys and Compounds,2016,680:462-466.
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