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Influence of Heat Treatment on Microstructures and Impact Toughness of Mg-Al-Zn Alloy

  • Longhui Mao
  • Chuming Liu
  • Yingchun WanEmail author
  • Jianshen Wei
  • Yonghao Gao
  • Shunong Jiang
  • Zhiyong Chen
Technical Article
  • 8 Downloads

Abstract

Microstructures and impact properties of the rolled Mg-8.10Al-0.46Zn-0.18Mn-0.18Ag (wt.%) alloy were investigated under various thermal conditions including as-rolled, solid solution (T4) and solid solution plus aging (T6) states. The results show that the impact toughness of the as-rolled alloy is slightly enhanced after solution treatment but remarkably reduced by the subsequent aging process, exhibiting a similar trend with the elongation of the alloy. Fractography analysis suggests that the impact toughness variations are closely associated with the changes in the deformation mode: the superior impact toughness of the as-rolled and T4 samples are mainly attributed to the occurrence of profuse twins during impact testing, while, in the T6 sample, the twinning activity is significantly suppressed due to the presence of β-Mg17Al12 phases. In addition, the lamellar-shaped β-Mg17Al12 phases are easy to fracture, which accelerates the crack propagation and thus degrades the impact property.

Notes

Acknowledgements

This work was supported by National Basic Research Program of China (Grant No. 2013CB632200), National Natural Science Foundation of China (Grant No. 51574291) and the Fundamental Research Funds of Central South University (Grant No. 502221707).

Supplementary material

11837_2019_3585_MOESM1_ESM.pdf (308 kb)
Supplementary material 1 (PDF 308 kb)

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Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  • Longhui Mao
    • 1
  • Chuming Liu
    • 1
  • Yingchun Wan
    • 1
    Email author
  • Jianshen Wei
    • 1
  • Yonghao Gao
    • 1
  • Shunong Jiang
    • 2
  • Zhiyong Chen
    • 1
  1. 1.School of Materials Science and EngineeringCentral South UniversityChangshaChina
  2. 2.School of Civil EngineeringCentral South UniversityChangshaChina

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