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Microstructure Evolution and Properties Improvement of Semi - solid Squeezed A356 Alloy during Heat Treatment
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Affiliation:

1.Key Laboratory of Lightweight Structural Materials Liaoning Province,School of Materials Science and Engineering,Northeastern University;2.The CITIC Dicastal Institute

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Fund Project:

National Key Research and Development Program of China (2018YFB2001800); National Natural Science Foundation of China (U1764254)

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    Abstract:

    A356 alloy was processed by semi - solid squeeze casting followed by solution treatment at 540℃. With increasing solution time, Mg and Si elements dissolved into the matrix and led to solid solution strengthening. Tensile strength, elongation and hardness peaked at 6 h and then decreased during solution treatment. Aging treatment at 180℃ for different time was carried out after solution treatment. With increasing aging time, the fine spherical Mg2Si phases precipitated in the A356 alloy matrix, which were ca. 2 μm in size. The optimum heat treatment process was solid solution at 540℃ for 6 h followed by aging at 180℃ for 4 h. After solution and aging treatment, tensile strength and elongation reached 336 MPa and 6.9%, respectively. Hardness value reached 124 HV after heat treatment, which was 106.7% higher than the cast alloy.

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[Di Tie, Lufei Yan, Renguo Guan, Zhaoshan Ji, Hongchao Li, Xiang Wang, Haifeng Liu, Debao Liu, Minfang Chen. Microstructure Evolution and Properties Improvement of Semi - solid Squeezed A356 Alloy during Heat Treatment[J]. Rare Metal Materials and Engineering,2021,50(3):746~752.]
DOI:10.12442/j. issn.1002-185X.20200026

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History
  • Received:January 12,2020
  • Revised:February 17,2020
  • Adopted:February 21,2020
  • Online: April 02,2021
  • Published: