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Home > Archive>Volume 50, Issue 9, 2021 >3125-3132. DOI:10.12442/j.issn.1002-185X.20200574
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Microstructure Evolution and Mechanical Properties of Al-Zn-Mg-Cu-Zr Alloy of Heterogeneous Lamellar Structure Processed by High Pressure Torsion
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Affiliation:

School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China

Clc Number:

TG311

Fund Project:

National Natural Science Foundation of China (51575153, 51705119)

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    Abstract:

    The microstructures and mechanical properties of the Al-Zn-Mg-Cu-Zr alloy processed by high pressure torsion (HPT) at 400 °C were analyzed by transmission electron microscopy (TEM), electron back-scattered diffraction (EBSD), and Instron testing machine. The results show that the grain boundaries and the secondary phases in the grains of deformed specimens are significantly broken and refined, and the width of precipitation-free zones at the grain boundaries narrows, which greatly improves the strength and plasticity of the deformed specimens. The grain orientation of the initial specimen is randomly distributed. When the strain is small, the grain size, grain orientation, and the local orientation difference of the specimen all present heterogeneous lamellar distribution. The deformed specimens of 0.5 turn exhibit the optimal mechanical properties due to the back stress strengthening effect caused by the heterogeneous lamellar structure during deformation.

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[Xue Kemin, Wang Boxiaotian, Wu Guangshan, Yan Siliang, Li Ping. Microstructure Evolution and Mechanical Properties of Al-Zn-Mg-Cu-Zr Alloy of Heterogeneous Lamellar Structure Processed by High Pressure Torsion[J]. Rare Metal Materials and Engineering,2021,50(9):3125~3132.]
DOI：10.12442/j. issn.1002-185X.20200574

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History
  • Received:August 05,2020
  • Revised:November 11,2020
  • Adopted:December 14,2020
  • Online: September 26,2021
  • Published: September 24,2021

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