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首页> 外文期刊>Materials Science and Engineering >Control of kink-band formation in mille-feuille structured Al/Al_2Cu eutectic alloys
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Control of kink-band formation in mille-feuille structured Al/Al_2Cu eutectic alloys

机译：Mille-Feuille结构化Al / Al_2Cu共晶合金的扭结带的控制

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摘要

Kink bands have recently received significant attention owing to their ability to increase the strength and ductility of some Mg alloys. In this study, we first demonstrated that it is also expected even in Al alloys, by controlling the morphology of the introduced kink bands. Several directionally solidified Al-Cu alloys, wherein an Al/Al_2CU eutectic lamellar microstructure developed, were focused, and the variations in deformation behavior with microstructure were examined. The alloys can be deformed at room temperature, and the yield stress exhibits strong anisotropy. A high yield stress appears when stress is applied parallel to the lamellar interface, accompanied by kink-band formation. The microstructure was found to play an important role in controlling kink-band formation and the resultant mechanical properties. Only a few large kink bands form in a eutectic alloy specimen with a full lamellar microstructure, which is accompanied by a lower yield stress. Thus, the kink band cannot be used positively in it. In hypoeutectic alloys in which primary Al grains coexist with the lamellar microstructure, however, significantly high yield stresses appear, which are accompanied by the homogeneous formation of small kink bands. The results demonstrate that microstructural control can vary the role of the deformation kink band from the fracture (buckling) mode to the deformation mode via the change in its morphology. This enables a large increase in yield stress while maintaining the ductility of the Al/Al_2Cu eutectic alloy. The high yield stress is maintained at temperatures up to -300 °C owing to the high thermal stability of the lamellar microstructure. These findings provide new ways to develop novel high-temperature high-strength Al alloys.
机译：由于它们能够提高一些镁合金的强度和延展性，扭结乐队最近受到了重大关注。在这项研究中，我们首先表明它也在通过控制引入的扭结条件的形态来预期。几种定向凝固的Al-Cu合金，其中展开了Al / Al_2Cu共晶层状微观结构，并检查了微观结构的变形行为的变化。合金可以在室温下变形，屈服应力表现出强烈的各向异性。当应力平行于层状界面时，出现高屈服应力，伴随着扭结界面。发现微观结构在控制扭结带形成和所得的机械性能方面发挥着重要作用。在具有全层层微观结构的共晶合金标本中仅形成少量大的扭结带，其伴随着较低的屈服应力。因此，扭结频带不能正面使用。然而，在双抗凝胶结合合金中，其中原发性Al颗粒与层状微观结构共存，显着显着高屈服应力，其伴随着小扭结带的均匀形成。结果表明，微观结构控制可以通过其形态的变化来改变变形扭结带从断裂（屈曲）模式到变形模式的作用。这使得能够在保持Al / Al_2Cu共晶合金的延展性的同时大幅增加。由于层状微观结构的高热稳定性，高屈服应力保持在高达-300℃的温度。这些调查结果提供了开发新型高温高强度Al合金的新方法。

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  • 来源
    《Materials Science and Engineering》 |2021年第21期|141849.1-141849.12|共12页
  • 作者

    Koji Hagihara; Toko Tokunaga; Katsuaki Nishiura; Shohei Uemichi; Shuhei Ohsawa;

  • 作者单位

    Department of Physical Science and Engineering Nagoya Institute of Technology Gokiso Nagoya 466-8555 Japan Division of Materials and Manufacturing Science Graduate School of Engineering Osaka University 2-1 Yamadaoka Suita Osaka 565-0871 Japan;

    Department of Physical Science and Engineering Nagoya Institute of Technology Gokiso Nagoya 466-8555 Japan;

    Department of Adaptive Machine Systems Graduate School of Engineering Osaka University 2-1 Yamadaoka Suita Osaka 565-0871 Japan;

    Division of Materials and Manufacturing Science Graduate School of Engineering Osaka University 2-1 Yamadaoka Suita Osaka 565-0871 Japan;

    Department of Physical Science and Engineering Nagoya Institute of Technology Gokiso Nagoya 466-8555 Japan;

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  • 正文语种 eng
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  • 关键词

    Deformation kink band; Aluminum alloy; Plastic deformation; Mille-feuille structure; Mechanical properties;

    机译：变形扭结带;铝合金;塑性变形;Mille-Feuille结构;机械性能;

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