Effects of Y and Sc on Microstructures and Properties of A356Alloy

Zhang Aisheng; Gong Yuanxing

doi:10.15980/j.tzzz.2014.10.006

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Effects of Y and Sc on Microstructures and Properties of A356Alloy
Vol. 34, Issue 10, Pages: 1032-1034(2014)
Published： 2014 ，
DOI： 10.15980/j.tzzz.2014.10.006

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[1]章爱生,龚远兴.Y和Sc对A356合金组织与性能的影响[J].特种铸造及有色合金,2014,34(10):1032-1034.

Zhang Aisheng, Gong Yuanxing. Effects of Y and Sc on Microstructures and Properties of A356Alloy. [J]. Special Casting & Nonferrous Alloys 34(10):1032-1034(2014)
[1]章爱生,龚远兴.Y和Sc对A356合金组织与性能的影响[J].特种铸造及有色合金,2014,34(10):1032-1034. DOI： 10.15980/j.tzzz.2014.10.006.

Zhang Aisheng, Gong Yuanxing. Effects of Y and Sc on Microstructures and Properties of A356Alloy. [J]. Special Casting & Nonferrous Alloys 34(10):1032-1034(2014) DOI： 10.15980/j.tzzz.2014.10.006.

摘要

对比研究了微量稀土元素Y、Sc对A356合金铸态显微组织和力学性能的影响。结果表明

0.3%的Y、0.3%的Sc均能明显减小合金中α-Al枝晶间距

细化α-Al晶粒

使片状共晶Si部分纤维化

但对Si变质效果均不如Sr。等量Y和Sc细化变质效果相比

Y的细化效果不如Sc

但Sc对共晶Si的变质效果不如Y;与之相对应

Y提高A356合金铸态力学性能的幅度优于等量Sc。

Abstract

Effects of minor Y and Sc on microstructures and mechanical properties of A356 alloy were investigated by OM（optical microscopy）

SEM（scanning electron microscopy）

XRD（X-ray diffraction）and tensile testing.The results show that both Y and Sc with 0.3%addition not only obviously reduce secondary dendrite arm spacing and refine primaryα-Al phase

but also transform the morphology of eutectic silicon partly from lamellar to fibre structure.However

modification effects on eutectic silicon are weaken to strontium.With equal addition amount of Y and Sc in A356 alloy

the modification effect of Y is superior Sc

however

refining effects of Y is lower than Sc.Effects of Y on improving the as-cast mechanical properties of A356 alloy is accordingly greater than Sc.