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金属学报  2007, Vol. 43 Issue (11): 1171-1175     
  论文 本期目录 | 过刊浏览 |
Sr对AZ91D镁合金枝晶生长和相析出的影响
周吉学 汪 彬 童文辉 杨院生
中国科学院金属研究所
Effect of Strontium Addition on Dendrite Growth and Phase Precipitation in AZ91D Magnesium Alloy
ZHOU Jixue; WANG Bin; TONG Wenhui; YANG Yuansheng
Institute of Metal Research; Chinese Academy of Sciences
引用本文:

周吉学; 汪彬; 童文辉; 杨院生 . Sr对AZ91D镁合金枝晶生长和相析出的影响[J]. 金属学报, 2007, 43(11): 1171-1175 .
, , , . Effect of Strontium Addition on Dendrite Growth and Phase Precipitation in AZ91D Magnesium Alloy[J]. Acta Metall Sin, 2007, 43(11): 1171-1175 .

全文: PDF(1235 KB)  
摘要: 研究了微量Sr(0.01-0.1%,质量分数)对AZ91D镁合金枝晶生长和相析出的影响. 结果表明,加入微量Sr可明显细化AZ91D合金晶粒;随着添加量增加,初生相α-Mg枝晶逐渐球化,非平衡析出相β-Mg17A112增多;加入0.1% Sr后,在枝晶间β-Mg17A112相上依附析出针状或杆状Al4Sr新相. AZ91D合金凝固过程中Sr在固液界面前沿富集,并且优先在曲率较大的枝晶端面富集,抑止晶粒长大,从而增加允许形核时间,提高了形核数量,同时Sr的尖端富集降低了初生相α-Mg的尖端生长优势,球化了枝晶组织.
关键词 AZ91D镁合金组织细化Al4Sr析出相    
Abstract:Effects of Sr addition on dendrite growth and phase precipitation of AZ91D alloy was studied. The experimental results showed that addition of 0.01-0.1wt%Sr to AZ91D alloy decreased the grain size obviously and promoted formation of globular grains. With the increase of Sr content the morphology of β-Mg17A112 phase in the alloy was changed and the amount of the phase increased. Meanwhile, the needle-like or pole-like Al4Sr phase adhering to the β-Mg17A112 phase at grain boundaries was observed. The enrichment of Sr element at solidification interface front, especially at the tip of α-Mg dendrite, restricts the growth of α-Mg dendrite and changes the preferential growth of α-Mg, which results in the grain refinement and modification of α-Mg dendrite.
Key wordsmagnesium alloy AZ91D    Sr    grain refinement    Al4Sr precipitation
收稿日期: 2007-02-12     
ZTFLH:  TG146  
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