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Effects of Al-10Sr master alloys on grain refinement of AZ31 magnesium alloy

ISSN号：1003-6326
期刊名称：《中国有色金属学报：英文版》
时间：0
分类：TG13[金属学及工艺—合金;一般工业技术—材料科学与工程;金属学及工艺—金属学]
作者机构：[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
相关基金：Project（50725413） supported by the National Natural Science Foundation for Distinguished Young Scholar in China; Project （2007CB613704） supported by the National Basic Research Program of China

关键词： Al-10Sr合金, AZ31镁合金, 精练技术, 金属学, Al-10Sr master alloy, AZ31 magnesium alloy, grain refinement, Al4Sr phase

中文摘要：

AZ31 镁合金的谷物精炼上的 Al-10Sr 主人合金的效果被调查，并且不同 Al-10Sr 主人合金的精炼效率(商业， solubilized，滚动并且 remelted+rapidly 冷却了) 被比较并且分析。结果显示在不同 Al-10Sr 的微观结构的 Al4Sr 阶段的形态学和尺寸掌握合金，差别大。为商业 Al-10Sr 主人合金， Al4Sr 阶段在为 4 h 在 500 ° C 被溶解并且走水路列在后面以后从粗糙的块形状演变到相对好的块形状熄灭；但是在为 50% 减小或 remelted 在 300 ° C 被卷并且由快速的冷却列在后面以后， Al4Sr 阶段主要展出好小粒和纤维形状。另外，不同 Al-10Sr 主人合金能有效地减少 AZ31 镁合金的谷物尺寸，但是他们的精炼效率是不同的。remelting 并且快速的冷却获得的 Al-10Sr 主人合金的精炼效率是最好，然后滚动， solubilized 和商业 Al-10Sr 主人合金接着是。为不同 Al-10Sr 主人合金的精炼效率的差别可能在 AZ31 镁合金的 melt 与有不同形态学和尺寸的 Al4Sr 阶段的溶解率有关。

英文摘要：

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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