吉林大学学报(工学版) ›› 2016, Vol. 46 ›› Issue (5): 1577-1582.doi: 10.13229/j.cnki.jdxbgxb201605028

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Microstructure and mechanical property of Mg2Si/Al composites fabricated by semi-solid extrusion under different isothermal heat treatments

LIU Xiao-bo1,2, ZHOU De-kun1, ZHAO Yu-guang2   

  1. 1.College of Mechanical Engineering, Beihua University, Jilin 132021,China;
    2.College of Materials Science and Engineering, Jilin University, Changchun 130022,China
  • Received:2015-06-07 Online:2016-09-20 Published:2016-09-20

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Abstract: Mg2Si/Al composites were fabricated by gravity casting and semi-solid extrusion. The microstructure and mechanical property of the composites were investigated. The results show that after isothermal heat treatment the semisolid Mg2Si/Al composites form spherical reinforced phase and matrix structure. The effect of the isothermal heat treatment temperature on the microstructure and mechanical was studied. In addition, the hardness of the semi-solid extrusion composites with isothermal heat treatment temperatures of 555 ℃, 565 ℃ and 570 ℃ under specific pressure of 255 MPa are enhanced by 26.09%, 39.13% and 31.30% respectively in comparison with the casting composite. The tensile test results show that the ultimate tensile strength and elongation of the Mg2Si/Al composites fabricated by semi-solid extrusion reach 274 MPa and 8.75% respectively.

Key words: metallic materials, in-situ Mg2Si/Al composite, isothermal heat treatment, semi-solid extrusion, mechanical property

CLC Number: 

  • TB331
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