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首页> 外文期刊>Materials Science and Engineering >Microstructure and superelasticity control by rolling and heat treatment in columnar-grained Cu-Al-Mn shape memory alloy
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Microstructure and superelasticity control by rolling and heat treatment in columnar-grained Cu-Al-Mn shape memory alloy

机译：轧制和热处理的圆柱状Cu-Al-Mn形状记忆合金的组织和超弹性控制

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摘要

The effects of rolling and heat treatment on the microstructure and superelasticity of columnar-grained Cu_(71)Al_(18)Mn_(11) shape memory alloy were investigated in this paper. Two different rolling strategies were adopted: (ⅰ) multipass high-temperature rolling (HR); (ⅱ) one-pass HR followed by several-pass cold rolling (HR+nCR). For the first rolling strategy, the results showed that columnar-grained microstructure was reserved after one-pass HR at 800 ℃ with rolling reduction of above 80%, and recrystallization would occur if more HR processes were applied. The superelastic strain could reach 5.9% in multipass HR sample through microstructure control by annealing at 800 ℃. For the second rolling strategy, after the first pass HR with the reduction of 80% and annealing at 550 ℃, the alloy could be cold rolled at room temperature with total reduction of 50-70%. The columnar-grained microstructure still existed in the cold-rolled alloy which consisted of two phases (i.e. β_1 + a). After recrystallization annealing, the HR+nCR alloy tend to form < 011 > texture along the rolling direction, which was helpful to obtain high superelasticity. Finally, the grain growth heat treatment was used to further improve the superelasticity of the cold-rolled alloy. After 2-3 times abnormal grain growth heat treatment, the grains of the alloy could grow up from several hundred micrometers to more than one centimeter in diameter; they still had strong < 011 > texture along the rolling direction, which enabled the superelastic strain of as high as about 7%.
机译：研究了轧制和热处理对圆柱状Cu_（71）Al_（18）Mn_（11）形状记忆合金组织和超弹性的影响。采用两种不同的轧制策略：（ⅰ）多道次高温轧制（HR）； （ⅱ）一遍HR，然后进行几遍冷轧（HR + nCR）。对于第一种轧制策略，结果表明，在800℃进行一次热轧后，柱状晶粒组织得以保留，轧制压下率超过80％，如果再进行热轧工艺，则会发生重结晶。通过在800℃退火进行显微组织控制，在多道HR样品中超弹性应变可以达到5.9％。对于第二种轧制策略，经过第一道HR压下率降低80％并在550℃退火后，该合金可以在室温下冷轧，总压下率达50-70％。在由两相（即β_1+ a）组成的冷轧合金中仍存在柱状晶粒组织。经过再结晶退火后，HR + nCR合金易于在轧制方向上形成<011>织构，有助于获得较高的超弹性。最后，通过晶粒生长热处理进一步改善了冷轧合金的超弹性。经过2-3次异常晶粒生长热处理，合金的晶粒可以从几百微米长到直径超过一厘米。它们在轧制方向上仍具有很强的<011>织构，从而使超弹性应变高达7％左右。

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  • 来源
    《Materials Science and Engineering》 |2017年第1期|315-322|共8页
  • 作者

    Ji-li Liu; Zhi Hong Chen; Hai-you Huang; Jian-xin Xie;

  • 作者单位

    School of Science, Wuhan University of Technology, Wuhan 430070, China,Beijing Laboratory of Metallic Materials and Processing for Modern Transportation, University of Science and Technology Beijing, Beijing 100083, China;

    School of Science, Wuhan University of Technology, Wuhan 430070, China;

    Beijing Laboratory of Metallic Materials and Processing for Modern Transportation, University of Science and Technology Beijing, Beijing 100083, China;

    Beijing Laboratory of Metallic Materials and Processing for Modern Transportation, University of Science and Technology Beijing, Beijing 100083, China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Columnar grain; Cu-Al-Mn; Shape memory alloy; a phase; Rolling; Grain growth;

    机译：柱状纹;铜铝锰;形状记忆合金;一个阶段滚动谷物生长;

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