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Effect of Particle Size on the Mechanical Properties of Semi-Solid, Powder-Rolled AA7050 Strips

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Abstract

The AA7050 alloy strips can be successfully prepared by semi-solid powder rolling. The effect and factors of particle size on the microstructure, relative density, and mechanical properties were discussed. The results show that coarse starting powders require less liquid to achieve high relative density, and the formed strips have lower elongation compared with that prepared with the fine starting powders. The strength is more related to defects, whereas elongation partially depends on the grain size. Additionally, the fracture mechanism of strips prepared with fine powders is the ductile fracture because many dimples are observed. For relative density, when the initial liquid fraction is lower than 10%, the difference of deformation degree is the main factor. When the liquid fraction is higher than 10–20%, premature solidification and more particle interfaces are the two main factors.

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Acknowledgements

The authors thank the financial supports from Fundamental Research Funds for the Central Universities (Grant No. 2011ZZ0010) and Science and Technology Innovation Project of Guangdong Provincial Department of Education (2013KJCX0014).

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Authors and Affiliations

  1. National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials, South China University of Technology, Guangzhou, 510640, People’s Republic of China

    Xia Luo & Yunzhong Liu

  2. School of Materials Science and Engineering, Southwest Petroleum University, Chengdu, 610500, People’s Republic of China

    Xia Luo

Authors
  1. Xia Luo
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  2. Yunzhong Liu
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Correspondence to Xia Luo.

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Luo, X., Liu, Y. Effect of Particle Size on the Mechanical Properties of Semi-Solid, Powder-Rolled AA7050 Strips. JOM 68, 3078–3087 (2016). https://doi.org/10.1007/s11837-016-2030-y

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  • DOI: https://doi.org/10.1007/s11837-016-2030-y

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