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首页> 外文期刊>Materials Science and Engineering >Microstructure and properties of Cu-Al-Ni shape memory alloy strips prepared via hot densification rolling of argon atomized powder preforms
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Microstructure and properties of Cu-Al-Ni shape memory alloy strips prepared via hot densification rolling of argon atomized powder preforms

机译：氩雾化粉末预成型坯热致密化轧制制备的Cu-Al-Ni形状记忆合金带的组织和性能

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摘要

In the present work, Cu-Al-Ni SMA strips with grain size less than 100 μm were successfully prepared via a novel powder metallurgy route involving hot densification rolling of unsheathed sintered powder preforms prepared from argon atomized pre-alloyed Cu-Al-Ni powder. It has been shown that the hot rolled Cu-Al-Ni strips exhibited a very small grain growth during heat treatment at 950 ℃ up to 4 h. This behavior was attributed to the pinning effect of nano-sized alumina segregated on the grain boundaries. It was established that the grain size of the finished Cu-Al-Ni strips is governed by the starting powder particle size, and the mechanism of this aspect has been discussed. The finished heat-treated Cu-Al-Ni alloy strips consisted of elongated shape grains, with average grain size approximately 27 μm. The heat treated strips were fully martensitic in nature consisting of self-accommodated β' martensite along with small amount of γ_1 martensite. The heat treated strips had an extremely good combination of average fracture strength (~626 MPa) and fracture strain (~13.5%). The two-way shape memory strain was found approximately 0.23% after 25 training cycles at 4% applied training strain.
机译：在目前的工作中，成功地通过一种新型粉末冶金方法成功制备了晶粒尺寸小于100μm的Cu-Al-Ni SMA带材，该方法包括对由氩气雾化的预合金化Cu-Al-Ni粉末制备的无护套烧结粉末预成型坯进行热致密化轧制。 。结果表明，在950℃至4 h的热处理过程中，热轧的Cu-Al-Ni钢带的晶粒生长很小。该行为归因于偏析在晶界上的纳米级氧化铝的钉扎效应。已经确定完成的Cu-Al-Ni带材的晶粒尺寸由起始粉末的粒度决定，并且已经讨论了这方面的机理。成品的热处理过的Cu-Al-Ni合金带材由细长的晶粒组成，平均晶粒尺寸约为27μm。热处理后的钢带本质上是完全马氏体，由自适应的β'马氏体和少量的γ_1马氏体组成。热处理后的钢带具有平均断裂强度（〜626 MPa）和断裂应变（〜13.5％）的极佳组合。在施加4％的训练应变25个训练周期后，发现双向形状记忆应变约为0.23％。

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  • 来源
    《Materials Science and Engineering》 |2011年第2011期|p.378-387|共10页
  • 作者

    S.K. Vajpai; R.K. Dube; S. Sangal;

  • 作者单位

    Department of Materials Science and Engineering, Indian Institute ofTechnology, Kanpur, Uttar Pradesh 208016, India;

    Department of Materials Science and Engineering, Indian Institute ofTechnology, Kanpur, Uttar Pradesh 208016, India;

    Department of Materials Science and Engineering, Indian Institute ofTechnology, Kanpur, Uttar Pradesh 208016, India;

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  • 正文语种 eng
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  • 关键词

    shape memory alloys powder metallurgy; cu-al-ni sma hot rolling;

    机译：形状记忆合金粉末冶金;cu-ni sma热轧;

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