...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Materials Science and Engineering >Failure behavior of high pressure die casting AZ91D magnesium alloy
【24h】

Failure behavior of high pressure die casting AZ91D magnesium alloy

机译：高压压铸AZ91D镁合金的失效行为

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The failure behavior of high pressure die casting AZ91D magnesium alloy during both tensile and fatigue tests was studied in situ by using scanning electron microscope. Attention was focused on the role of microstructure played in crack initiation and propagation. Results showed that the defects in castings, including gas pore, shrinkage pore and defect band, were the crack initiation sources. In tensile test, the crack propagated in a combination of intergranular and transgranular modes, and the specimen fractured by connecting defects at the section with minimum effective force bearing area. In fatigue test, the crack propagated in a transgranular mode at specific crystalline planes. When the crack was in contact with the β-phase, the crack would pass through, and fracture the network β-phase, whereas bypass the island β-phase by detaching it from the surrounding α-Mg grains. Besides, defects in front of the crack would act as the secondary crack initiation sources, from which new cracks would initiate and propagate. With the propagation of the fatigue crack, the actual maximum cyclic stress would increase to the fracture stress of the left cross section and lead to the final fracture of the specimen.
机译：利用扫描电子显微镜对AZ91D镁合金压铸件在拉伸和疲劳试验中的失效行为进行了现场研究。注意的是微观结构在裂纹萌生和扩展中的作用。结果表明，铸件的缺陷包括气孔，收缩孔和缺陷带是裂纹产生的来源。在拉伸试验中，裂纹以晶间和透晶模式相结合的方式扩展，并且通过在最小有效受力面积的截面上连接缺陷使试样断裂。在疲劳试验中，裂纹在特定的晶面以跨晶模式扩展。当裂纹与β相接触时，裂纹会通过并破坏网络β相，而通过从周围的α-Mg晶粒中分离出岛β相来绕开。此外，裂纹前的缺陷将作为次要的裂纹萌生源，新的裂纹将从这些裂纹萌生和扩展。随着疲劳裂纹的扩展，实际的最大循环应力将增加到左截面的断裂应力，并导致试样的最终断裂。

著录项

  • 来源
    《Materials Science and Engineering》 |2016年第30期|216-225|共10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,Key Laboratory for Advanced Materials Processing Technology, Ministry of Education, Tsinghua University, Beijing 100084, China;

    School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China,Key Laboratory for Advanced Materials Processing Technology, Ministry of Education, Tsinghua University, Beijing 100084, China;

    School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China,Key Laboratory for Advanced Materials Processing Technology, Ministry of Education, Tsinghua University, Beijing 100084, China;

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

    High pressure die casting; AZ91D magnesium alloy; Failure behavior; Crack;

    机译：高压压铸;AZ91D镁合金;失败行为;裂纹;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号