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首页> 外文期刊>Materials Science and Engineering >Microfracture behaviour of extruded Mg-Zn-Y alloys containing long-period stacking ordered structure at room and elevated temperatures
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Microfracture behaviour of extruded Mg-Zn-Y alloys containing long-period stacking ordered structure at room and elevated temperatures

机译：在室温和高温下具有长堆积结构的挤压Mg-Zn-Y合金的微断裂行为

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摘要

We studied the fracture behaviour of extruded Mg-Zn-Y alloys at room temperature (RT) and at 523 K using microfracture testing. An Mg_(97)Zn_1Y_2 alloy was used to obtain two-phase specimens consisting of α-Mg and long-period stacking ordered (LPSO) structure phases, and an Mg_(88)Zn_5Y_7 alloy was used to obtain specimens consisting of an LPSO phase. The microfracture testing of the two-phase specimen revealed that the fracture behaviour changed from brittle to ductile as the testing temperature increased. By contrast, the LPSO-phase specimen remained brittle even at the elevated temperature and the intrinsic fracture toughness values obtained at both testing temperatures were nearly identical. Ex situ transmission electron microscopy of the two-phase specimen showed that mechanical twinning in the α-Mg phase did not occur at the elevated temperature, although it was activated at RT. This suggests that the plastic deformation mode in the α-Mg phase plays a crucial part in the enhanced crack growth resistance of the two-phase alloy at the elevated temperature.
机译：我们使用微断裂试验研究了室温（RT）和523 K下挤压Mg-Zn-Y合金的断裂行为。 Mg_（97）Zn_1Y_2合金用于获得由α-Mg和长周期堆积有序（LPSO）结构相组成的两相试样，Mg_（88）Zn_5Y_7合金用于获得由LPSO相构成的试样。两相试样的微断裂试验表明，随着试验温度的升高，断裂行为从脆性变为延性。相反，即使在升高的温度下，LPSO相试样仍保持脆性，并且在两个测试温度下获得的固有断裂韧性值几乎相同。两相试样的异位透射电子显微镜显示，尽管在室温下活化，但在高温下并未发生α-Mg相的机械孪晶。这表明，在高温下，α-Mg相的塑性变形模式对增强两相合金的抗裂纹扩展性起着至关重要的作用。

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  • 来源
    《Materials Science and Engineering》 |2013年第15期|63-69|共7页
  • 作者

    Yoji Mine; Hajime Yoshimura; Mitsuhiro Matsuda; Kazuki Takashima; Yoshihito Kawamura;

  • 作者单位

    Department of Materials Science and Engineering, Kumamoto University Kurokami, Chuo-ku, Kumamoto 860-8555, Japan;

    Department of Materials Science and Engineering, Kumamoto University Kurokami, Chuo-ku, Kumamoto 860-8555, Japan,Japan Casting & Forging Corporation, Japan;

    Department of Materials Science and Engineering, Kumamoto University Kurokami, Chuo-ku, Kumamoto 860-8555, Japan;

    Department of Materials Science and Engineering, Kumamoto University Kurokami, Chuo-ku, Kumamoto 860-8555, Japan;

    Department of Materials Science and Engineering, Kumamoto University Kurokami, Chuo-ku, Kumamoto 860-8555, Japan,Magnesium Research Centre, Kumamoto University Kurokami, Chuo-ku, Kumamoto 860-8555, Japan;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Mechanical characterization; Intermetallics; Magnesium alloys; Crystal plasticity; Fracture;

    机译：机械特性金属间化合物镁合金;晶体可塑性;断裂;

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