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首页> 外文期刊>Materials Science and Engineering >Influence of strongly textured microstructure on the all-round shape memory effect of rapidly solidified Ni_(51)Ti_(49) alloy
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Influence of strongly textured microstructure on the all-round shape memory effect of rapidly solidified Ni_(51)Ti_(49) alloy

机译：强织构化组织对快速凝固Ni_（51）Ti_（49）合金全方位形状记忆效应的影响

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摘要

Ni_(51)Ti_(49) alloy strip with all-round shape memory effect (ARSME) was obtained through rapid solidification followed by constraint-aging treatment. The high cooling rate and large temperature gradient along the thickness direction of Ni_(51)Ti_(49) alloy strip yield fine columnar grains and strong fiber texture of < 100 > B2 during rapid solidification. Such fine-grained and strongly textured microstructure increases the nucleation, limits the orientation and restricts the growth of Ni_4Ti_3 precipitates during constraint-aging treatment. The fine and well-aligned Ni_4Ti_3 precipitates with dispersive distribution introduce strong coherent stress field and numerous interfaces between the matrix and precipitates in the rapidly solidified and constraint-aged Ni_(51)Ti_(49) alloy. Homogeneous composition and massive interfaces in the B2 matrix promote the simultaneity of local phase transformations. The strong coherent stress field and the excellent deformability of < 100 > B2-°riented grains contribute to large deformation and high recovery ratio of the alloy during phase transformation. Thus, the strongly textured microstructure formed during rapid solidification allows the constraint-aged NiTi alloy to possess superior ARSME with narrow phase transformation temperature range.
机译：通过快速凝固，然后进行时效时效处理，获得具有全面形状记忆效应（ARSME）的Ni_（51）Ti_（49）合金带。 Ni_（51）Ti_（49）合金带材沿厚度方向的高冷却速率和大温度梯度会在快速凝固过程中产生细小的柱状晶粒和<100> B2的强纤维织构。这样的细晶粒和强烈织构的微观结构增加了形核，限制了取向并限制了约束时效处理过程中Ni_4Ti_3析出物的生长。 Ni_4Ti_3细小且排列整齐且具有分散分布的析出物会引入强大的相干应力场，并且在快速凝固和时效受限的Ni_（51）Ti_（49）合金中，基体与析出物之间形成许多界面。 B2矩阵中的均相组成和大量界面促进了局部相变的同时性。强大的相干应力场和<100> B2取向晶粒的出色可变形性，有助于合金在相变过程中发生大变形，并具有很高的回收率。因此，在快速凝固过程中形成的强烈织构的微观结构使受限制时效的NiTi合金在相变温度范围窄的情况下具有优异的ARSME。

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  • 来源
    《Materials Science and Engineering》 |2017年第29期|273-281|共9页
  • 作者

    Y.Y. Li; S.S. Cao; X. Ma; C.B. Ke; X.P. Zhang;

  • 作者单位

    School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China;

    School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China;

    School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China;

    School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China;

    School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    NiTi alloy; Texture; Rapid solidification; All-round shape memory effect; Ni_4Ti_3 precipitate;

    机译：镍钛合金;质地;快速凝固;全方位的形状记忆效果;Ni_4Ti_3沉淀;

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