原位Al_(2)O_(3)变质与热处理对铸造过共晶铝硅合金组织和性能的影响  

Effect of In-situ Al_(2)O_(3) Modification and Heat Treatment on Microstructure and Properties of Cast Hypereutectic Al-Si Alloy

作　　者：何卫 王利民 李辛庚 宗立君 林玉辉 李成栋[4] HE Wei;WANG Limin;LI Xingeng;ZONG Lijun;LIN Yuhui;LI Chengdong(Nanrui Group Co.,Ltd.(State Grid Electric Power Research Institute Co.,Ltd.),Nanjing 211106,China;Wuhan Nari Power Engineering Technology Equipment Co.,Ltd.,Wuhan 430415,China;Electric Power Research Institute,State Grid Shandong Electric Power Company,Jinan 250002,China;College of Materials Science and Engineering,Qingdao University of Science and Technology,Qingdao 266042,China)

机构地区：[1]南瑞集团有限公司(国网电力科学研究院有限公司),江苏南京211106 [2]武汉南瑞电力工程技术装备有限公司,湖北武汉430415 [3]国网山东省电力公司电力科学研究院,山东济南250002 [4]青岛科技大学材料科学与工程学院,山东青岛266042

出　　处：《青岛科技大学学报（自然科学版）》2022年第5期64-69,共6页Journal of Qingdao University of Science and Technology:Natural Science Edition

基　　金：国家自然科学基金项目(51672145)。

摘　　要：利用金相显微镜(OM)、扫描电子显微镜(SEM)、X-射线能谱仪(EDS)、硬度计等测试手段,研究了在过共晶铝硅合金中加入CuO原位生成Al_(2)O_(3)对初晶硅的变质作用以及热处理对变质后的过共晶铝硅合金组织和性能的影响。结果表明:原位生成的Al_(2)O_(3)对过共晶铝硅合金的初晶硅的变质细化作用显著,同时生成的Al_(2)Cu型化合物作为增强相提高了过共晶铝硅合金的硬度。变质后的铝硅合金经过热处理后,针状的共晶硅球化,趋近于短棒状和球状,固溶8 h、时效8 h后合金硬度最大,可达维氏硬度HV 77.1,与热处理前相比,硬度增幅为1.3%。In this paper, the modification of primary silicon by adding CuO into hypereutectic Al-Si alloy and the effect of heat treatment on the microstructure and properties of hypereutectic Al-Si alloy were studied by means of OM、SEM、EDS and hardness tester. The results show that the primary silicon of hypereutectic Al-Si alloy can be modified and refined by in-situ formed Al_(2)O_(3), and the hardness of hypereutectic Al-Si alloy is improved by the formation of Al_(2)Cu type compound as reinforcing phase. After heat treatment, the acicular eutectic silicon spheroidizes and tends to be short rod and spherical. The hardness of the modified Al-Si alloy reaches HV 77.1 after 8 h solution and 8 h aging. Compared with that before heat treatment, the hardness increases by 1.3%.

关 键 词：过共晶铝硅合金 细化 原位Al_(2)O_(3) 热处理 

分 类 号：TG13[一般工业技术—材料科学与工程]