微量钪对A357合金组织与性能的影响
Effect of Trace Sc on Microstructure and Properties of A357 Alloy
黄为民1， 章爱生1， 颜小明2
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作者单位：（1.南昌大学 材料科学与工程学院，江西 南昌 330031； 2.江西永特合金有限公司， 江西 萍乡 337100）
中文关键字：Sc; A357铸造铝硅合金; 显微组织; 力学性能
英文关键字：Sc; A357 alloy; microstructure; mechanical properties
中文摘要：采用金相观察、力学性能测试、扫描电镜及X射线衍射分析，研究了微量钪对A357合金组织与性能的影响。结果表明：0.2wt%Sc加入A357合金中，能强烈细化α-Al；也能一定程度改善共晶硅相的形态，但对共晶硅相的变质效果远小于Sr。Sc、Sr联合加入，对A357合金的铸态组织细化变质效果显著，使合金的力学性能大幅提高。
英文摘要：The effects of trace Sc on the microstructure and mechanical properties of A357 alloy were investigated by optical microscope, mechanical property testing, scanning electron microscopy and X-ray diffraction analysis. The results show that adding 0.2% Sc into A357 alloy can remarkably refine α-Al and modify eutectic Si to some extent, but the modification efficiency of using Sc is much less than that of using Sr； by combined adding Sc and Sr， a well-modified structure is obtained, as a result， there is a significant improvement in mechanical properties of the alloy.