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Mechanical properties and failure characteristics of cast and extruded Mg_(97)Y_2Zn_1 alloys with LPSO phase

机译:LPSO相铸造和挤压Mg_(97)Y_2Zn_1合金的力学性能和破坏特性

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摘要

Mechanical properties and failure characteristics of Mg_(97)Y_2Zn_1 (at%) alloys, prepared by gravity casting and extrusion processes, are examined experimentally. High tensile and fatigue strengths are obtained for extruded Mg_(97)Y_2Zn_1 alloys, with the values being approximately twice as high as those for cast Mg_(97)Y_2Zn_1 alloys. Such high strengths are attributed to the high internal stress arising from the complicated microstructure and severe lattice strain in the α-Mg and long-period stacking order phases. On the other hand, a high fracture strain is obtained for cast Mg_(97)Y_2Zn_1 alloy, which is affected not only by the lower internal stress, but also severe kink deformation. The failure characteristics, e.g., crack growth characteristics are examined via direct observation during tensile and fatigue tests at micro- and nano-scales. Meandering fatigue crack growth is obtained for the cast Mg_(97)Y_2Zn_1 alloys. The mean roughness of the fracture surface for cast Mg_(97)Y_2Zn_1 alloys is more than twice as high as that for commercially available AM60 and AZ91 cast alloys. A coarse fracture surface that was observed in the cast Mg_(97)Y_2Zn_1 alloys would make severe roughness-induced crack closure, leading to high fatigue strength.
机译:实验研究了重力铸造和挤压工艺制备的Mg_(97)Y_2Zn_1(at%)合金的力学性能和破坏特性。 Mg_(97)Y_2Zn_1合金的拉伸强度和疲劳强度高,约为铸造Mg_(97)Y_2Zn_1合金的强度和疲劳强度的两倍。如此高的强度归因于复杂的微观结构和在α-Mg以及长周期堆积顺序相中产生的高晶格应变,从而产生了高内应力。另一方面,铸造的Mg_(97)Y_2Zn_1合金的断裂应变高,不仅受较低的内应力影响,而且还存在严重的扭结变形。通过在微米和纳米级的拉伸和疲劳测试期间的直接观察来检查破坏特性,例如裂纹扩展特性。 Mg_(97)Y_2Zn_1铸造合金的疲劳裂纹扩展较快。 Mg_(97)Y_2Zn_1铸造合金的断裂表面平均粗糙度是市售AM60和AZ91铸造合金断裂表面的平均粗糙度的两倍以上。在铸造的Mg_(97)Y_2Zn_1合金中观察到较粗糙的断裂表面会导致严重的粗糙度引起的裂纹闭合,从而导致较高的疲劳强度。

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  • 来源
    《Materials Science and Engineering》 |2016年第15期|14-29|共16页
  • 作者单位

    Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushimanaka, Kita-ku, Okayama 700-8530, Japan;

    Graduate School of Science and Technology, Department of Mechanical Engineering, Research Unit for Materials Science under Ultra-high Pressure, Ehime University, 3 Bunkyo-cho, Matsuyama, Ehime 790-8577, Japan;

    Graduate School of Science and Technology, Department of Mechanical Engineering, Research Unit for Materials Science under Ultra-high Pressure, Ehime University, 3 Bunkyo-cho, Matsuyama, Ehime 790-8577, Japan;

    Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushimanaka, Kita-ku, Okayama 700-8530, Japan;

    School of Mechanical and Mining Engineering, The University of Queensland, St Lucia, Brisbane, Qld 4072, Australia,Magnesium Research Center/Department of Materials Science, Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto 860-8555, Japan;

    Magnesium Research Center/Department of Materials Science, Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto 860-8555, Japan;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Magnesium alloy; Long-period stacking order phase; Mechanical property; Failure analysis; Crack growth characteristic;

    机译:镁合金长期堆放订单阶段;机械性能故障分析;裂纹扩展特征;

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