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Rare Metals

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Strain-controlled fatigue characteristics of a cast Mg–Nd–Zn under peak-aged and over-aged conditions

  • Zhen-Ming Li
  • Ji-Chun Dai
  • Bao-Liang Liu
  • Hui Zou
  • Ji-Peng Pan
Article
  • 2 Downloads

Abstract

Strain-controlled fatigue characteristics of peak-aged and over-aged Mg96.47Nd2.9Zn0.21 magnesium alloys containing 0.42Zr, including stress response, strain resistance, hysteresis loops, strain–life and corresponding low-cycle fatigue life prediction model, were studied. In the peak-aged state (T61: 540 °C × 8 h + 200 °C × 14 h), the alloy shows higher cyclic stress response, but lower ductility than the alloy in the over-aged state (T62: 540 °C × 8 h + 200 °C × 400 h). The yield strength and ultimate tensile strength of the alloy under T61- and T62-treated conditions are close. Compared with T61-treated alloy, the steady stress amplitude occurred in T62-treated alloy is due to higher ductility and more homogenous deformation. In T61 state, the fatigue cracks in the alloy first initiate along the cracked persistent slip bands and then propagate in the trans-granular mode, while in the T62 state, the fatigue cracks initiate along grain boundaries and then propagate in the inter-granular mode.

Keywords

Mg–Nd–Zn alloy Strain-controlled fatigue Peak-aged and over-aged conditions Hysteresis energy 

Notes

Acknowledgements

This work was financially supported by the Key Research Project of Jiangxi Academy of Sciences (No.2017–YZD2–03), the Introduction Doctoral Program of Jiangxi Academy of Sciences (No. 2016–YYB–09) and the Collaborative innovation GSP Project of Jiangxi Academy of Sciences (No. 2016–XTPH1–09). The authors are grateful to Prof. Qigui Wang (General Motors Company) and Prof. Alan A. Luo (Ohio State University) for their helpful discussions. The authors are also grateful to Prof. Liming Peng and Dr. Penghuai Fu (SJTU) for providing the Mg–Nd alloy. The authors also acknowledge Shanghai Jiao Tong University for access to experimental facilities and thank Dr. Haiyan Yue at Shanghai Jiao Tong University for her SEM analysis.

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Copyright information

© The Nonferrous Metals Society of China and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Institute of Sci-technology StrategyJiangxi Academy of SciencesNanchangChina
  2. 2.Zhejiang Jinfei Kaida Wheel Co., LtdJinhuaChina
  3. 3.Research Institute (R & D Center)Shanghai JuneBang Technology CorporationShanghaiChina
  4. 4.National Engineering Research Center of Light Alloy Net FormingShanghaiChina
  5. 5.National Engineering Research Center of Light Alloy Net FormingShanghai Jiao Tong UniversityShanghaiChina

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