Effect of Sr Modification on Eutectic Silicon Morphology in Al-6Si-3Cu-0.3Mg Alloy

Pan Yanpeng; Zhang Zhifeng; Li Bao; Gao Mingwei; Xu Jun

doi:10.15980/j.tzzz.2015.03.028

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Effect of Sr Modification on Eutectic Silicon Morphology in Al-6Si-3Cu-0.3Mg Alloy
Vol. 35, Issue 3, Pages: 321-324(2015)
Published： 2015 ，
DOI： 10.15980/j.tzzz.2015.03.028

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[1]潘彦鹏,张志峰,李豹,高明伟,徐骏.Sr变质对Al-6Si-3Cu-0.3Mg合金共晶Si形貌的影响[J].特种铸造及有色合金,2015,35(03):321-324.

Pan Yanpeng, Zhang Zhifeng, Li Bao, et al. Effect of Sr Modification on Eutectic Silicon Morphology in Al-6Si-3Cu-0.3Mg Alloy. [J]. Special Casting & Nonferrous Alloys 35(3):321-324(2015)
[1]潘彦鹏,张志峰,李豹,高明伟,徐骏.Sr变质对Al-6Si-3Cu-0.3Mg合金共晶Si形貌的影响[J].特种铸造及有色合金,2015,35(03):321-324. DOI： 10.15980/j.tzzz.2015.03.028.

Pan Yanpeng, Zhang Zhifeng, Li Bao, et al. Effect of Sr Modification on Eutectic Silicon Morphology in Al-6Si-3Cu-0.3Mg Alloy. [J]. Special Casting & Nonferrous Alloys 35(3):321-324(2015) DOI： 10.15980/j.tzzz.2015.03.028.

摘要

在660℃浇注Al-6Si-3Cu-0.3Mg合金试样

分别研究了添加0、0.005%、0.01%、0.02%、0.04%、0.06%的Sr对铸态合金中共晶Si形貌的影响

以及495℃×8h固溶+水淬+170℃×8h时效热处理对共晶Si圆整度的影响。结果表明

当Sr添加量为0.04%时可有效细化共晶Si组织

并在热处理后使得Si颗粒细小圆整

而当Sr添加量增大到0.06%时

分布在共晶组织周围的多边形含Sr化合物会明显增加

对合金性能起消极作用。

Abstract

Cast Al-6Si-3Cu-0.3Mg alloy was prepared by permanent mold at 660℃.Effects of 0

.06%Sr modification on eutectic silicon morphology in as-cast and T6 treated alloy were investigated

and T6 treatment was conducted at 495℃for 8hours solid solution and water quenching and 170℃for 8hours aging.The results show that the eutectic silicon can be refined greatly with addition of 0.04%Sr

and the morphology of eutectic silicon is converted from long strip into dot or short bar under T6 condition.With the Sr content increasing to 0.06%

the volume of polygonal Sr-compounds can be increased around eutectic silicon phase

which has a negative effect on the alloy properties.