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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 18    No. 1    January 2008

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Effects of Al-10Sr master alloys on grain refinement of AZ31 magnesium alloy
YANG Ming-bo(杨明波)1, 2, PAN Fu-sheng(潘复生)2, CHENG Ren-ju(程仁菊)2, TANG Ai-tao(汤爱涛)2

1. College of Materials Science and Engineering, Chongqing Institute of Technology, Chongqing 400050, China;2. College of Materials Science and Engineering, Chongqing University, Chongqing 400030, China

Abstract:The effects of Al-10Sr master alloys on grain refinement of AZ31 magnesium alloy were investigated, and the refinement efficiency of different Al-10Sr master alloys (commercial, solubilized, rolled and remelted+rapidly cooled) was compared and analyzed. The results indicate that the morphology and size of Al4Sr phases in the microstructures of different Al-10Sr master alloys, are of great difference. For the commercial Al-10Sr master alloy, the Al4Sr phases evolve from coarse block shape to relatively fine block shape after being dissolved at 500 ℃ for 4 h and followed by water quenching; but after being rolled at 300 ℃ for 50% reduction or remelted and followed by rapid cooling, the Al4Sr phases mainly exhibit fine granule and fibre shapes. In addition, the different Al-10Sr master alloys can effectively reduce the grain size of AZ31 magnesium alloy, but their refinement efficiency is different. The refinement efficiency of the Al-10Sr master alloy obtained by remelting and rapid cooling is the best, then the rolled, solubilized and commercial Al-10Sr master alloys are in turn. The difference of refinement efficiency for different Al-10Sr master alloys may be related to the dissolution rates of Al4Sr phases with different morphologies and sizes in the melt of AZ31 magnesium alloy.

 

Key words: Al-10Sr master alloy; AZ31 magnesium alloy; grain refinement; Al4Sr phase

ISSN 1672-7029
CN 43-1423/U

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