Effects of Antimony on Microstructure and Mechanical Properties of A356 Alloy

Shen Yubin; Wang Mingxing; Liu Zhiyong; Liu Zhongxia; Song Tianfu

doi:10.15980/j.tzzz.2012.12.018

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Effects of Antimony on Microstructure and Mechanical Properties of A356 Alloy
Vol. 32, Issue 12, Pages: 1098-1102(2012)
Published： 2012 ，
DOI： 10.15980/j.tzzz.2012.12.018

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[1]申玉彬,王明星,刘志勇,刘忠侠,宋天福.Sb变质A356合金的组织与力学性能[J].特种铸造及有色合金,2012,32(12):1098-1102.

Shen Yubin, Wang Mingxing, Liu Zhiyong, et al. Effects of Antimony on Microstructure and Mechanical Properties of A356 Alloy. [J]. Special Casting & Nonferrous Alloys 32(12):1098-1102(2012)
[1]申玉彬,王明星,刘志勇,刘忠侠,宋天福.Sb变质A356合金的组织与力学性能[J].特种铸造及有色合金,2012,32(12):1098-1102. DOI： 10.15980/j.tzzz.2012.12.018.

Shen Yubin, Wang Mingxing, Liu Zhiyong, et al. Effects of Antimony on Microstructure and Mechanical Properties of A356 Alloy. [J]. Special Casting & Nonferrous Alloys 32(12):1098-1102(2012) DOI： 10.15980/j.tzzz.2012.12.018.

摘要

研究了Sb对A356合金中共晶Si相的变质作用及RE对Sb变质作用的影响

并且与Sr变质合金进行了比较

对Sb、Sb+RE以及Sr变质A356合金的拉伸及疲劳性能进行了对比。结果表明

Sb的A356合金变质使共晶Si相由粗大的板片状转化为细小的纤维状

但变质效果不如Sr;用Sb变质处理时

加入少量的RE

可明显改善Sb的变质效果

降低获得最佳变质效果的Sb含量;合金变质的力学性能不如Sr变质合金

但疲劳性能明显优于Sr变质合金。其原因可能与Sb或Sb+RE变质合金的致密性较Sr变质合金高、铸造缺陷较Sr变质合金少有关。

Abstract

The modification of antimony（Sb）on eutectic Si phase in A356aluminum-silicon alloy and the effects of rare earth（RE）on the modification efficiency of antimony were investigated

and effects of the strontium（Sr）on A356 alloy were analyzed comparatively.The tensile and fatigue properties of the Sb

Sb+RE or Sr modified A356 alloys were also analyzed comparatively.The results show that Sb can refine the eutectic silicon phases in A356 alloy significantly from plate-like into fine fibrous structure.However

the modification efficiency of Sb is lower than Sr.The modification effects can be improved obviously in Sb modified A356 aluminum-silicon alloy with the addition of a little RE

decreasing of Sb content for achieving the desirable modification efficiency.The tensile properties of the Sb or Sb+RE modified A356 alloys are lower than those of the Sr modified alloy

however

the fatigue properties are superior to that of the Sr modified alloy

which may be attributed to the higher compactness and less casting defects in Sb or Sb+RE modified alloys compared with the Sr modified alloy.