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首页> 外文期刊>Materials Science and Engineering >Texture-induced anisotropic phase transformation in a NiTi shape memory alloy
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Texture-induced anisotropic phase transformation in a NiTi shape memory alloy

机译：NiTi形状记忆合金中的纹理诱导各向异性相变

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摘要

Texture-induced anisotropic phase transformation of a rolled NiTi sheet was investigated via uniaxial tension and cyclic loading using in situ laboratory X-ray diffraction. The tensile tests were carried out along rolling direction (RD) and transverse direction (TD), which respectively have the highest and lowest phase transformation plateau strain. The initial preferred orientations of the rolled sheet (single austenite phase) concentrate on the ζ and γ fibers, i.e. <110>∥ND and <111>∥ND (normal direction). For loading along RD, six favorably oriented martensite variants form and lead to the formation of the new texture component {111}<112>, whereas along TD, three favorably oriented martensite variants form, making the initial {110}<110> texture component stronger. Besides, the Lüders band can be clearly observed in the first cycle of cyclic loading, during which the favorably oriented martensite variants are firstly induced, followed by the less-favorably oriented martensite variants. The martensite transformation continues after the phase transformation plateau via the propagation of the favorably and less-favorably oriented martensite variants. At high cycles, Lüders band cannot be observed due to remained traces of martensite and grain refinement.
机译：使用原位实验室X射线衍射通过单轴张力和循环载荷研究了轧制NiTi板的织构诱导各向异性相变。沿滚动方向（RD）和横向（TD）进行拉伸试验，它们分别具有最高和最低的相变平稳期应变。压延板的初始优选取向（单奥氏体相）集中在ζ和γ纤维上，即<110>∥ND和<111>∥ND（法线方向）。对于沿RD加载，形成了六个有利取向的马氏体变体，并导致形成了新的纹理成分{111} <112>；而沿着TD，形成了三个有利取向的马氏体变体，形成了初始的{110} <110>更强。此外，在循环载荷的第一个循环中可以清楚地观察到吕德斯带，在此期间首先诱导取向良好的马氏体变体，然后诱导取向不利的马氏体变体。马氏体转变在相变平台之后通过有利和不利取向的马氏体变体的传播而继续。在高循环下，由于残留的马氏体和晶粒细化的痕迹，无法观察到吕德斯带。

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  • 来源
    《Materials Science and Engineering》 |2018年第7期|96-103|共8页
  • 作者

    L. Wang; L. Ma; C. Liu; Z.Y. Zhong; S.N. Luo;

  • 作者单位

    Key Laboratory of Advanced Technologies of Materials, Ministry of Education, Southwest Jiaotong University,The Peac Institute of Multiscale Sciences;

    Key Laboratory of Advanced Technologies of Materials, Ministry of Education, Southwest Jiaotong University,The Peac Institute of Multiscale Sciences;

    Key Laboratory of Advanced Technologies of Materials, Ministry of Education, Southwest Jiaotong University,The Peac Institute of Multiscale Sciences;

    Key Laboratory of Advanced Technologies of Materials, Ministry of Education, Southwest Jiaotong University,The Peac Institute of Multiscale Sciences;

    Key Laboratory of Advanced Technologies of Materials, Ministry of Education, Southwest Jiaotong University,The Peac Institute of Multiscale Sciences;

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  • 正文语种 eng
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  • 关键词

    Texture; Phase transformation; Anisotropy; NiTi shape memory alloy; In situ X-ray diffraction;

    机译：织构;相变;各向异性;NiTi形状记忆合金;原位X射线衍射;

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