不同等温热处理条件下半固态挤压Mg2Si/Al复合材料的组织和性能

doi:10.13229/j.cnki.jdxbgxb201605028

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

不同等温热处理条件下半固态挤压Mg₂Si/Al复合材料的组织和性能

刘晓波^1,2, 周德坤¹, 赵宇光²

1.北华大学机械工程学院, 吉林省吉林市 132021;
2.吉林大学材料科学与工程学院, 长春 130022

收稿日期:2015-06-07 出版日期:2016-09-20 发布日期:2016-09-20
通讯作者: 赵宇光(1955-),男,教授,博士生导师.研究方向:金属基复合材料的设计、制备与性能.E-mail:zhaoyg@jlu.edu.cn
作者简介:刘晓波(1979-),女,副教授,博士.研究方向:新金属材料的设计与制备.E-mail:stone-666@126.com
基金资助:
国家自然科学基金项目(50671044,51564005); 吉林省科技发展计划项目(20070506).

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

LIU Xiao-bo^1,2, ZHOU De-kun¹, ZHAO Yu-guang²

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

摘要/Abstract

摘要： 采用重力铸造和等温热处理半固态挤压的方法制备了Mg₂Si/Al复合材料,并研究了复合材料的组织及性能。结果表明:经过等温热处理后得到了基体α-Al和增强相Mg₂Si双球化的半固态组织,其中,Mg₂Si颗粒呈现球化,α-Al呈现规则球形或椭球形。与普通重力铸造Mg₂Si/Al复合材料相比,等温热处理温度为555 ℃、565 ℃和570 ℃的半固态挤压Mg₂Si/Al复合材料的布氏硬度分别提高了26.09%、39.13%和31.30%。拉伸测试试验结果表明:等温热处理565 ℃时,半固态挤压Mg₂Si/Al复合材料的抗拉强度达到了274 MPa,延伸率达到了8.75%。

关键词: 金属材料, 原位Mg2Si/Al复合材料, 等温热处理, 半固态挤压, 力学性能

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

中图分类号:

TB331

刘晓波, 周德坤, 赵宇光. 不同等温热处理条件下半固态挤压Mg₂Si/Al复合材料的组织和性能[J]. 吉林大学学报(工学版), 2016, 46(5): 1577-1582.

LIU Xiao-bo, ZHOU De-kun, ZHAO Yu-guang. Microstructure and mechanical property of Mg₂Si/Al composites fabricated by semi-solid extrusion under different isothermal heat treatments[J]. 吉林大学学报(工学版), 2016, 46(5): 1577-1582.

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不同等温热处理条件下半固态挤压Mg₂Si/Al复合材料的组织和性能

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

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