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Acta Metallurgica Sinica (English Letters)

, Volume 32, Issue 2, pp 178–186 | Cite as

Detailed Structures and Formation Mechanisms of Well-Known Al10RE2Mn7 Phase in Die-Cast Mg–4Al–4RE–0.3Mn Alloy

  • Qiang YangEmail author
  • Shu-Hui Lv
  • Fan-Zhi Meng
  • Kai Guan
  • Bai-Shun Li
  • Xu-Hu Zhang
  • Jing-Qi Zhang
  • Xiao-Juan Liu
  • Jian MengEmail author
Article
  • 28 Downloads

Abstract

The detailed structures and the corresponding formation mechanisms of the well-known Al10RE2Mn7 phase in the conventional die-cast Mg–4Al–4RE–0.3Mn alloy were thoroughly investigated using transmission electron microscopy (TEM). The results indicate that the Al10RE2Mn7 phase ordinarily contains both normal \((11\overline{2} 1)\) twins and orientation twins. Both detailed TEM observations and density functional theory calculations indicate that the Al10RE2Mn7 phase is transferred from the Al8REMn4 phase following an orientation relationship as \([010]_{{{\text{Al}}_{ 8} {\text{REMn}}_{ 4} }} / /[\overline{1} 101]_{{{\text{Al}}_{ 1 0} {\text{RE}}_{ 2} {\text{Mn}}_{ 7} }}\) and \((101)_{{{\text{Al}}_{ 8} {\text{REMn}}_{ 4} }} / /(11\overline{2} 0)_{{{\text{Al}}_{ 1 0} {\text{RE}}_{ 2} {\text{Mn}}_{ 7} }}\). Moreover, forming orientation twins in the Al10RE2Mn7 phase is attributed to the blurry regions at incoherent twin boundaries in the Al8REMn4 phase. Finally, these formed orientation twins result in the \((11\overline{2} 1)\) twins in the Al10RE2Mn7 phase.

Keywords

Transmission electron microscopy Phase transformation Intermetallic phase Twin boundary Orientation relationship 

Notes

Acknowledgements

This work was supported financially by the National Natural Science Foundation of China (Nos. 51701200, 11804030 and 21521092) and the Project for Science and Technology Development of Jilin Province (Nos. 20180520004JH, 201602011004GX, 20170414001GH and 20180520160JH).

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Copyright information

© The Chinese Society for Metals (CSM) and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Qiang Yang
    • 1
    Email author
  • Shu-Hui Lv
    • 2
  • Fan-Zhi Meng
    • 2
  • Kai Guan
    • 1
    • 4
  • Bai-Shun Li
    • 1
    • 4
  • Xu-Hu Zhang
    • 3
  • Jing-Qi Zhang
    • 3
  • Xiao-Juan Liu
    • 1
  • Jian Meng
    • 1
    Email author
  1. 1.State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchunChina
  2. 2.School of Materials Science and EngineeringChangchun University of Science and TechnologyChangchunChina
  3. 3.Aerospace Research Institute of Materials and Processing TechnologyBeijingChina
  4. 4.University of Sciences and Technology of ChinaHefeiChina

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