添加稀土对Al-Mg-Si合金微观组织和性能的影响  

Effect of rare earth addition on microstructure and properties of Al-Mg-Si alloy

作　　者：陈保安 李梦琳 陈瑞 多俊龙 韩钰 祝志祥 杨长龙[3] 缪姚军[4] Chen Baoan;Li Menglin;Chen Rui;Duo Junlong;Han Yu;Zhu Zhixiang;Yang Changlong;Miao Yaojun(State Key Laboratory of Advanced Power Transmission Technology,State Grid Smart Grid Research Institute Co.,Ltd.,Beijing 102209,China;Department of Electrical Engineering New Materials,State Grid Smart Grid Research Institute Co.,Ltd.,Beijing 102209,China;Shenyang Electric Power Supply Company,State Grid Liaoning Electric Power Supply Co.,Ltd.,Shenyang Liaoning 110003,China;Jiangsu Zhongtian Technology Co.,Ltd.,Nantong Jiangsu 226463,China)

机构地区：[1]国网智能电网研究院有限公司先进输电技术全国重点实验室,北京102209 [2]国网智能电网研究院有限公司电工新材料研究所,北京102209 [3]国网辽宁省电力有限公司沈阳供电公司,辽宁沈阳110003 [4]江苏中天科技股份有限公司,江苏南通226463

出　　处：《金属热处理》2024年第7期100-105,共6页Heat Treatment of Metals

基　　金：国家电网有限公司总部科技项目(5500-202128250A-0-0-00)。

摘　　要：采用热轧和冷拔法制备了添加稀土(Ce或Sc)和未添加稀土的Al-Mg-Si合金单丝,并对其在175℃时效不同时间。采用SEM、TEM进行组织观察,通过电子万能试验机测试合金单丝的抗拉强度和伸长率,并通过微欧计对单丝电阻进行测试。结果表明,添加稀土元素能够改善微米级AlFeSi大颗粒的形貌和尺寸特征;在时效处理过程中,Ce元素对纳米级析出相特征无明显影响,而Sc元素能够抑制纳米析出相的析出和长大过程。含Sc合金中β″相的尺寸最小,分布也更加弥散。175℃时效4 h后,3种合金具有良好的综合性能,其中,添加Ce元素后合金的导电率最高(~56.2%IACS),而添加Sc元素后合金的抗拉强度最高(~350 MPa)。Single wires of Al-Mg-Si alloys with rare earth addition(Ce or Sc)and without rare earth(RE)addition were prepared by hot rolling and cold drawing,and aged at 175℃for different time.Microstructure of the alloy wires was observed by SEM and TEM,while the tensile strength and elongation were obtained by tensile test with electrical universal testing machine,and the resistance was also tested on digital micro-ohmmeter.The results show that the morphologies and size characteristics of micro-scale AlFeSi particles are improved owing to the RE addition.During the aging process,Ce has no obvious effect on the characteristics of nanoscale precipitates,while Sc can inhibit the precipitation and growth process of nanoscale precipitates.Therefore,the β″phase in Sc-containing alloys possesses minimum size and well-dispersed distribution.After aging at 175℃ for 4 h,considerably well-performed comprehensive properties are obtained for all the 3 alloys,among which the Ce-added alloy has the highest electric conductivity(about 56.2%IACS),while the Sc-added alloy exhibits the highest tensile strength(about 350 MPa).

关 键 词：AL-MG-SI合金 稀土 微观组织 抗拉强度 导电率 

分 类 号：TG244.2[金属学及工艺—铸造]