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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Microstructure and martensitic transformation of cast TiNiSi shape memory alloys
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Microstructure and martensitic transformation of cast TiNiSi shape memory alloys

机译：铸造TiNiSi形状记忆合金的组织和马氏体相变

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摘要

The martensitic transformation behavior, second phases and hardness of Ti_(51)Ni_(49-x)Si_x shape memory alloys (SMAs) with x=0, 1 and 2 at.% are investigated. The transformation temperature of one stage martensitic reaction B2<->B19' is associated with the forward (M_s) and reverse (A_s) martensitic transformations, respectively. All experimental DSC results such as martensitic transformation peaks (M*) and reverse martensitic transformation peaks (A*) are increased and became sharper with increasing Si-content. The microstructure investigation of the studied SMAs (Ti_(51)Ni_(49-x)Si_x) showed that there are two types of precipitated second phase particles. The first one is Ti_2Ni which mainly located at grain boundaries and intermetallic compound of Ti_2(Ni + Si) phase distributed inside the matrix. The volume fraction of these two phases is increased with Si content. Additionally, a small amount of Si remained in solid solution of the matrix of Ti_(51)Ni_(49-x)Si_x SMAs. Moreover, hardness of Ti_(51)Ni_(49-x)Si_x SMAs is increased as the Si-content increases.
机译：研究了x = 0、1和2 at。％的Ti_（51）Ni_（49-x）Si_x形状记忆合金（SMAs）的马氏体相变行为，第二相和硬度。一阶段马氏体反应B2→B19′的转变温度分别与正向（M_s）和反向（A_s）马氏体转变有关。随着Si含量的增加，所有的实验DSC结果（例如马氏体转变峰（M *）和反马氏体转变峰（A *））都会增加并变得更加清晰。对所研究的SMA（Ti_（51）Ni_（49-x）Si_x）的微观结构研究表明，有两种类型的沉淀第二相颗粒。第一个是Ti_2Ni，主要位于晶界和分布在基体内的Ti_2（Ni + Si）相的金属间化合物。这两个相的体积分数随Si含量的增加而增加。此外，Ti_（51）Ni_（49-x）Si_x SMAs的固溶体中残留有少量Si。此外，Ti_（51）Ni_（49-x）Si_x SMAs的硬度随着Si含量的增加而增加。

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