[1]孙瑜,廖恒成,孙国雄.Zr对Sr变质近共晶Al-Si铸造合金组织的影响[J].东南大学学报(自然科学版),2000,30(6):47-51.[doi:10.3969/j.issn.1001-0505.2000.06.011]
　Sun Yu,Liao Hengcheng,Sun Guoxiong.Influence of Zr on the Microstructure of Near-Eutectic Al-Si Casting Alloys Modified with Sr[J].Journal of Southeast University (Natural Science Edition),2000,30(6):47-51.[doi:10.3969/j.issn.1001-0505.2000.06.011]
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Zr对Sr变质近共晶Al-Si铸造合金组织的影响()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
30
期数:
2000年第6期
页码:
47-51
栏目:
材料科学与工程
出版日期:
2000-11-20

文章信息/Info

Title:
Influence of Zr on the Microstructure of Near-Eutectic Al-Si Casting Alloys Modified with Sr
作者:
孙瑜1;  廖恒成2;  孙国雄2
1 盐城工学院,盐城 224002; 2 东南大学机械工程系, 南京 210096
Author(s):
Sun Yu1;  Liao Hengcheng2;  Sun Guoxiong2
1 Yancheng Institute of Technology, Yancheng 224002
2 Department of Mechanical Engineering, Southeast University, Nanjing 210096
关键词:
Al-Si合金;  锆(Zr);  异质生核
Keywords:
Al-Si alloys;  Zr;  hetergeneous nucleation
分类号:
TG146
DOI:
10.3969/j.issn.1001-0505.2000.06.011
摘要:
Sr作为变质剂加入到Al-Si合金中能导致共晶硅的形态从粗大的片状(或针状)转变为细小的纤维状,但同时也促进长柱状枝晶的形成.为了抑制长柱状枝晶的形成,本研究采用金相显微镜和扫描电镜分析Zr对Sr变质近共晶Al-Si铸造合金组织的影响.结果表明,随着Zr加入量的增加,枝晶α(Al)有等轴化趋势,长柱状枝晶的主干长度缩短,且对共晶硅的形态、尺寸没有明显影响,当Zr加入量为0.5%～0.6%时,枝晶α完全等轴化.这是由于熔体中形成了ZrAl3颗粒,在合金凝固过程中,起到了异质生核作用.
Abstract:
The addition of Sr in Al-Si alloys as a modifier can result in transition of eutectic silicon from coarse plate-like or acicular to fine fibrous. However,it may also lead to the formation of long columnar dendrite α phase. The influence of Zr on microstructure of near-eutectic Al-Si alloys was studied using optical microscopy and SEM. The result indicated that increasing of Zr addition, α dendrite tends to change from long columnar to equiaxed, and there were no noticeable changes of the eutectic silicon. When adding 0.5%-0.6%Zr, the dendrite α phase was equiaxed fairly.This is because, during solidification,ZrAl3 particles were formed in the melt playing a role of hetergeneous nucleation.

参考文献/References:

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备注/Memo

备注/Memo:
第一作者:男, 1962年生, 硕士研究生, 讲师.
更新日期/Last Update: 2000-11-20