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首页> 外文期刊>Metallurgical and Materials Transactions A >In-Situ Transmission Electron Microscopy Observation on the Phase Transformation of Ti-Nb-Sn Shape Memory Alloys
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In-Situ Transmission Electron Microscopy Observation on the Phase Transformation of Ti-Nb-Sn Shape Memory Alloys

机译：Ti-Nb-Sn形状记忆合金的相变原位透射电镜观察

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摘要

The microstructural changes accompanied by phase transformation during heating and cooling of quenched (Ti-35 wt pct Nb)-0 to 6 wt pct Sn alloys have been investigated using in-situ transmission electron microscopy (TEM). Reversible transformation between orthorhombic α″ and body-centered-cubic (bcc) β phases occurs on heating and cooling between 300 and 423 K in quenched (Ti-35 wt pct Nb)-3 and 5 wt pct Sn alloys, which consists of α″ martensite in the β matrix with diffused scattering after quenching. On the other hand, the reversibility was not observed in (Ti-35 wt pct Nb)-0 and 3 wt pct Sn alloys heated to 523 K or in quenched (Ti-35 wt pct Nb)-6 wt pct Sn alloy. The former is explained by stabilization of β phase due to precipitation of isothermal ω phase, and the latter by suppression of α″ martensitic transformation. These results clearly show that the formation of α″ martensite and isothermal ω phases from the unstable β phase influences shape memory behaviors in Ti-Nb-Sn alloys.
机译：使用原位透射电子显微镜（TEM）研究了淬火（Ti-35 wt％Nb）-0至6 wt％Sn合金的加热和冷却过程中伴随相变的微观结构变化。在淬火的（Ti-35 wt pct Nb）-3和5 wt pct Sn合金中，由α组成的正交晶α”相和体心立方（bcc）β相之间的可逆转变发生在300至423 K之间的加热和冷却中''β基体中的马氏体淬火后具有弥散散射。另一方面，在加热到523 K的（Ti-35 wt pct Nb）-0和3 wt pct Sn合金或淬火的（Ti-35 wt pct Nb）-6 wt pct Sn合金中未观察到可逆性。前者是由于等温ω相的析出而使β相稳定，后者是通过抑制α”马氏体相变来解释的。这些结果清楚地表明，不稳定的β相形成α''马氏体相和等温ω相会影响Ti-Nb-Sn合金的形状记忆行为。

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  • 来源
    《Metallurgical and Materials Transactions A》 |2008年第12期|2820-2829|共10页
  • 作者

    Satoshi Semboshi; Takahiro Shirai; Toyohiko J. Konno; Shuji Hanada;

  • 作者单位

    Department of Materials Science Osaka Prefecture University Sakai Osaka 599-8531 Japan;

    Department of Materials Science Osaka Prefecture University Sakai Osaka 599-8531 Japan;

    Institute for Materials Research Tohoku University Aoba-ku Sendai Miyagi 980-8577 Japan;

    Institute for Materials Research Tohoku University Aoba-ku Sendai Miyagi 980-8577 Japan;

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