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首页> 外文期刊>Materials Science and Engineering >On the porosity induced by externally solidified crystals in high-pressure die-cast of AM60B alloy and its effect on crack initiation and propagation
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On the porosity induced by externally solidified crystals in high-pressure die-cast of AM60B alloy and its effect on crack initiation and propagation

机译：AM60B合金高压压铸中外部凝固晶体引起的孔隙及其对裂纹萌生和扩展的影响

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摘要

The porosity induced by the externally solidified crystals (ESCs) in high pressure die casting of AM60B magnesium alloy was investigated. Attention was focused on the formation of the porosity due to the presence of ESCs and its effect on the crack initiation and propagation during tensile deformation. Based on experimental observations using optical microscopy, scanning electron microscopy and the 3-D high resolution X-ray tomography, it was found that the porosity induced by ESCs could be categorized into two types. The first type of porosity was relatively small in size, globular in geometry and dispersed inside the microstructure, whereas the second type was larger in size with an interconnected structure. During the in situ observation of tensile deformation, significant crack could be observed at grain boundaries where the second type of porosity was present. The crack propagated by connecting the neighboring porosities towards a direction perpendicular to the tensile stress. The interdendritic shrinkage during solidification at the ESC boundaries was shown to be the primary reason for the formation of the second type of porosity.
机译：研究了AM60B镁合金高压铸造中外部凝固晶体（ESC）引起的孔隙率。注意力集中在由于ESC的存在而导致的孔隙形成及其对拉伸变形过程中裂纹萌生和扩展的影响上。基于使用光学显微镜，扫描电子显微镜和3-D高分辨率X射线断层摄影术的实验观察，发现由ESC引起的孔隙率可分为两种类型。第一种孔隙尺寸相对较小，几何形状呈球状且分散在微结构内部，而第二种孔隙尺寸较大，具有互连结构。在原位观察拉伸变形时，在存在第二种孔隙度的晶界处可以观察到明显的裂纹。裂纹通过将相邻的孔隙连接到垂直于拉伸应力的方向而扩展。凝固过程中在ESC边界的枝晶间收缩被证明是形成第二种孔隙的主要原因。

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  • 来源
    《Materials Science and Engineering》 |2015年第1期|35-41|共7页
  • 作者

    X. Li; S.M. Xiong; Z. Guo;

  • 作者单位

    School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;

    School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China,State Key Laboratory of Automobile Safety and Energy, Tsinghua University, Beijing 100084, China;

    School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    High pressure die casting; Porosity; Externally solidified crystals; Crack;

    机译：高压压铸;孔隙率外部凝固的晶体;裂纹;

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