Effects of Al-10Sr master alloys on grain refinement of AZ31 magnesium alloy |
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| Authors: | YANG Ming-bo PAN Fu-sheng CHENG Ren-ju TANG Ai-tao |
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| Affiliation: | [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 |
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| 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. |
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| Keywords: | Al-10Sr master alloy AZ31 magnesium alloy grain refinement Al4Sr phase |
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