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首页> 外文期刊>Materials Science and Engineering >Effect of heat treatment time on microstructure and mechanical properties of Ti-19Nb-9Zr (at%) shape memory alloy
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Effect of heat treatment time on microstructure and mechanical properties of Ti-19Nb-9Zr (at%) shape memory alloy

机译：热处理时间对Ti-19Nb-9Zr（at％）形状记忆合金组织和力学性能的影响

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摘要

The effect of heat treatment time on microstructure and shape memory effect of Ti-19Nb-9Zr (at%) alloy is investigated. The transformation energy and constituent phase show tremendous sensitivity to the heat treatment time. In the present work, the HT10 (Heat-treated for 10 min) TiNbZr specimen consists of a large amount of martensites and obtained the highest martensitic transformation energy (～ 11 J/g) while the HT80 (Heat-treated for 80 min) TiNbZr shows a predominant β structure with very low martensitic transformation energy. Furthermore, athermal ω phase is found in the HT80 TiNbZr specimen. Since a longer heat treatment time followed by quenching (with larger grain size) is in favor of the formation of athermal ω phase, we suggested that the fine athermal ω phase may be attributed to the decrease of thermodynamic driving force of martensitic transformation. Finally, perfect shape memory effect is obtained after heating when the maximum pre-strains loading up to 6% in the precipitate free HT10 TiNbZr specimen.
机译：研究了热处理时间对Ti-19Nb-9Zr（at％）合金的组织和形状记忆效果的影响。转变能和组成相对热处理时间表现出极大的敏感性。在目前的工作中，HT10（热处理10分钟）TiNbZr标本由大量马氏体组成，并获得最高的马氏体转变能（〜11 J / g），而HT80（热处理80分钟）TiNbZr显示出具有非常低的马氏体转变能的主要β结构。此外，在HT80 TiNbZr样品中发现了无热ω相。由于较长的热处理时间然后淬火（具有较大的晶粒尺寸）有利于无热ω相的形成，因此我们认为细无热ω相可归因于马氏体相变的热力学驱动力的降低。最后，在无沉淀的HT10 TiNbZr试样中最大预应变加载达到6％时，加热后可获得理想的形状记忆效果。

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  • 来源
    《Materials Science and Engineering》 |2013年第20期|427-433|共7页
  • 作者

    L.W.Ma; H.S.Cheng; C.Y.Chung; B.Yuan;

  • 作者单位

    Department of Physics and Materials Science, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon Tong, Hong Kong, PR China;

    Department of Physics and Materials Science, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon Tong, Hong Kong, PR China;

    Department of Physics and Materials Science, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon Tong, Hong Kong, PR China;

    Department of Metallic Materials Science and Engineering, School of Materials Science and Engineering, South China University of Technology, PR China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Ti-Nb-Zr; shape memory effect; martensitic transformation;

    机译：Ti-Nb-Zr;形状记忆效应;马氏体转变;

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