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首页> 外文期刊>Materials Science and Engineering >Effect of grain size on stress induced martensitic transformations in a Cu-Al-Be polycrystalline shape-memory alloy. Pseudoelastic cycling effects and microstructural modifications
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Effect of grain size on stress induced martensitic transformations in a Cu-Al-Be polycrystalline shape-memory alloy. Pseudoelastic cycling effects and microstructural modifications

机译：晶粒尺寸对应力诱导的Cu-Al-Be多晶形状记忆合金中马氏体相变的影响。拟弹性循环效应和微观结构修饰

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摘要

Grain size has a strong effect on the pseudoelastic properties of shape-memory alloys. Different grain sizes and several related phenomena are studied. This involves the dependence of the transformation and retransformation stresses on grain size and on the amount of transformed material. A pronounced drop of transformation stresses on cycling is observed, until an asymptotic behavior is reached. This is related to the creation of defects (dislocations and dislocation arrays) and microplates of martensite, which are the defects necessary to allow the grains to accommodate due to the shape change imposed by the martensitic transformation. The asymptotic hysteresis is related to the internal work for the grains to accommodate each other once the necessary defects were created. The asymptotic hysteresis increases linearly as the grain size decreases. A simple model shows that the slope is related to the (d/e) ratio, where d is the average grain size and e is the width of the specimen. This effect arises from the presence of the free surfaces that release the plastic work for grain accommodation.
机译：晶粒尺寸对形状记忆合金的拟弹性具有很大的影响。研究了不同的晶粒尺寸和几种相关现象。这涉及相变和再相变应力对晶粒尺寸和相变材料量的依赖性。观察到自行车上的转变应力明显下降，直到达到渐近行为为止。这与马氏体的缺陷（位错和位错阵列）和微板的产生有关，这些缺陷是由于马氏体相变引起的形状变化而使晶粒适应所必需的缺陷。一旦产生必要的缺陷，渐近滞后与晶粒的内部工作相互适应。渐近磁滞随着晶粒尺寸的减小而线性增加。一个简单的模型显示出斜率与（d / e）比率有关，其中d是平均晶粒尺寸，e是试样的宽度。这种效果是由于自由表面的存在而产生的，该自由表面释放了用于谷物容纳的塑性加工。

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  • 来源
    《Materials Science and Engineering》 |2014年第15期|300-309|共10页
  • 作者

    M. Sade; F. de Castro Bubani; F.C. Lovey; V. Torra;

  • 作者单位

    Centro Atomico Bariloche (CNEA), Av. E. Bustillo km. 9.5, 8400 S.C. de Bariloche, Argentina,CONICET, Argentina, Av. Rivadavia 1917, C1033AAJ Buenos Aires, Argentina,Institute Balseiro, Universidad National de Cuyo, Av. E. Bustillo km. 9.5, 8400 S.C. de Bariloche, Argentina;

    Centro Atomico Bariloche (CNEA), Av. E. Bustillo km. 9.5, 8400 S.C. de Bariloche, Argentina,CONICET, Argentina, Av. Rivadavia 1917, C1033AAJ Buenos Aires, Argentina;

    Centro Atomico Bariloche (CNEA), Av. E. Bustillo km. 9.5, 8400 S.C. de Bariloche, Argentina,Institute Balseiro, Universidad National de Cuyo, Av. E. Bustillo km. 9.5, 8400 S.C. de Bariloche, Argentina;

    Polytechnical University of Catalonia, C. Jordi Girona, 31., 08034 Barcelona, Spain;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Martensitic transformations; Shape-memory effect; Pseudoelasticity; Transmission electron microscopy; Mechanical properties; Cu-base alloys;

    机译：马氏体转变;形状记忆效应;伪弹性;透射电子显微镜;机械性能铜基合金;

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