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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 15    No. 1    February 2005

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Effect of Mg on microstructures and properties of Al-Mg-Si-Cu aluminium alloys for automotive body sheets
LIU Hong(刘 宏)1, 2, SONG Wen-ju(宋文举)1, ZHAO Gang(赵 刚)1,
LIU Chun-ming(刘春明)1, ZUO Liang(左 良)1

1. School of Materials and Metallurgy, Northeastern University, 
Shenyang 110004, China;
2. School of Mechanical and Electrical Engineering, 
Shangdong Insitute of Light Industry,Ji′nan 250100, China

Abstract:The effects of variation of Mg content on microstructures, the tensile properties and the formability of Al-Mg-Si-Cu alloys for automotive body sheets were investigated by means of scan electron microscopy, optical metallographic analysis, tensile and Ericsson tests. The results show that for Al-Mg-Si-Cu aluminium alloys with excessive Si, with an increment of Mg content, the strength enhances, the specific elongation and Erisson values of alloys decrease, and the number of Mg2Si constituent increases and that of Al(MnFe)Si type constituents reduces. Al-Mg-Si-Cu aluminium alloys with excessive Si for automotive body sheets can present obviously the paint bake hardenability during the paint bake cycle (i.e. artificial aging at 170℃ for 30min immediately after the solution treatment and quenching). Suitable Mg content should be controlled in the range of 0.8% and 1.2%(mass fraction).

 

Key words: Al-Mg-Si-Cu alloys; automotive body sheets; Al(MnFe)Si; Mg2Si; stamping formability

ISSN 1672-7029
CN 43-1423/U

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