, Volume 71, Issue 12, pp 4737–4745 | Cite as

Evolution of the Initial Precipitation and Strengthening Mechanism of Al-Mg-Si alloys

  • Yaya Zheng
  • Binghui LuoEmail author
  • Zhenhai Bai
  • Chuan He
Microstructure Evolution During Deformation Processing


The evolution of the initial precipitation and strengthening mechanism of Al-Mg-Si alloys during non-isothermal aging were investigated. The results indicated that, during heating, two corresponding strength peaks appear, which were attributed to the precipitation of clusters and β″ precipitates. The strong coherency strain field attributed to β″ conferred maximum strengthening effects on Al-Mg-Si alloys. Three variants of clusters were identified, and the sequence of evolution was as follows: the spherical morphology of cluster 1 evolved into an elongated morphology, first located on the tight surface {111}Al plane and growing along the \( \left\langle {111} \right\rangle \)Al direction (cluster 2). When cluster 2 exceeded a certain size, it oriented itself on the {100}Al plane and along the \( \left\langle {100} \right\rangle \)Al direction as cluster 3, which was then transformed into the β″ phase. The strengthening contributions of the various initial precipitates of the alloy were ultimately evaluated.



This study is supported by the National Defense Foundation of China (Grant No. 2011-006).

Supplementary material

11837_2019_3856_MOESM1_ESM.pdf (333 kb)
Supplementary material 1 (PDF 333 kb)


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Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  • Yaya Zheng
    • 1
  • Binghui Luo
    • 1
    Email author
  • Zhenhai Bai
    • 1
  • Chuan He
    • 1
  1. 1.College of Materials Science and EngineeringCentral South UniversityChangshaChina

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