Bi、Mn变质对过共晶铝硅合金组织的影响.pdfVIP

第 37 卷第2 期 辽宁工业大学学报 (自然科学版) Vol.37, No.2 2 0 1 7 年 4 月 Journal of Liaoning University of Technology(Natural Science Edition) Apr. 2017 DOI: 10.15916/j.issn1674-3261.2017.02.009 Bi 、Mn 变质对过共晶铝硅合金 组织的影响 李明峰，刘 学，薛力强，高 敏，王国卫，岳旭东 （辽宁工业大学材料科学与工程学院，辽宁 锦州 121001） 摘 要：研究了 Bi 、Mn 变质对过共晶铝硅合金组织的影响。结果表明：经 3.4%Bi 元素变质后，过共晶铝硅 合金中的初生硅尺寸明显变大，经 3%Mn 元素变质后，组织中初晶硅形貌并没有改变，棱角仍很尖锐，而共晶硅 则都由长针状变成短棒状或颗粒状。加入合金元素后都形成了复合相，消耗了 P 的变质作用，减少了初晶硅的异 质核心，使初晶硅尺寸变大，同时减少了共晶硅所占比例。 关键词：变质; 初晶硅; 共晶硅 中图分类号：TG131 文献标识码：A 文章编号：1674-3261(20 17)02-0107-04 Effect of Bi and Mn Metamorphism on Hypereutectic Al-Si Alloy Organization LI Ming-feng, LIU Xue, XUE Li-qiang, GAO Min, WANG Guo-wei, YUE Xue-dong （Material Science and Engineering College, Liaoning University of Technology, Jinzhou 121001, China ） Abstract: The Effect of Bi and Mn Metamorphism on Hypereutectic Al-Si Alloy Organization is studied. The results show that the size of the primary Si in hypereutectic Al-Si alloy becomes significantly larger after adding 3.4% Bi element. The morphology of the primary Si in the microstructure whose edges are sharp doesn’t change and the shape of eutectic Si is short rod or graininess. Compound phase is formed after adding alloy elements to consume the effect of P metamorphism and decrease heterogeneous nuclei of the primary Si. So the size of the primary Si becomes larger and the proportion of eutectic Si is reduced. Key words: metamorphism; primary silicon; eutectic silicon 过共晶铝硅合金具有密度小、热