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High-Cycle Fatigue of Mg–6Gd–3Y–0.5Zr Cast Magnesium Alloys

  • Dehao MengEmail author
  • Peijie LiEmail author
  • Duanzhi Wang
  • Wenquan Yuan
  • Wencai Liu
Conference paper
Part of the Springer Proceedings in Physics book series (SPPHY, volume 217)

Abstract

This work studies the high-cycle fatigue of Mg–6Gd–3Y–0.5Zr cast magnesium alloy in as-cast and T6 states based on low-pressure sand casting and gravity permanent mold casting. The stress amplitude–number of cycle to failure diagram (S-N diagram) and fatigue strength of the alloy were obtained, and failure behavior of the alloy under cyclic loading was analyzed by OM and SEM. The results show that fatigue strength of low-pressure sand casting and gravity permanent mold casting is 105 and 95 MPa in as-cast states, respectively, which are increased by 14.3 and 21.1% after aging treatment. For the as-cast alloy, fatigue crack initiated from single point on the surface and cyclic deformation were controlled by twinning. However, for aged alloy, fatigue cracks originated from multi-positions on the surface and cyclic deformation were controlled by slips.

Keywords

Mg–Gd–Y–Zr High-cycle fatigue Sand casting Permanent mold casting 

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Copyright information

© Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  1. 1.Tsinghua UniversityBeijingChina
  2. 2.Beijing Institute of Aerospace Systems EngineeringBeijingChina
  3. 3.National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composites, School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghaiChina

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