Microstructure evolution and tensile behavior of balanced Al−Mg−Si alloy with various homogenization parameters  

不同均匀化参数下平衡Al-Mg-Si合金的组织演变和拉伸行为

作　　者：Dong JIN Hong-ying LI Zhi-xiang ZHU Chang-long YANG Yao-jun MIAO Chao XU Bao-an CHEN Zhen LIU 靳东;李红英;祝志祥;杨长龙;缪姚军;许超;陈保安;刘臻(中南大学材料科学与工程学院,长沙410083;国网智能电网研究院有限公司先进输电技术国家重点实验室,北京102209;国网辽宁省电力有限公司,沈阳110042;江苏中天科技股份有限公司,南通226010;中国电力科学研究院有限公司,北京100192)

机构地区：[1]School of Materials Science and Engineering,Central South University,Changsha 410083,China [2]State Key Laboratory of Advanced Power Transmission Technology,State Grid Smart Grid Research Institute Co.,Ltd.,Beijing 102209,China [3]State Grid Liaoning Electric Power Supply Co.,Ltd.,Shenyang 110042,China [4]Jiangsu Zhongtian Technology Co.,Ltd.,Nantong 226010,China [5]China Electric Power Research Institute Co.,Ltd.,Beijing 100192,China

出　　处：《Transactions of Nonferrous Metals Society of China》2024年第11期3536-3553,共18页中国有色金属学报（英文版）

基　　金：financially supported by State Grid Corporation of China (No.5500-202128250A-0-0-00)。

摘　　要：The effects of homogenization parameters on the microstructure evolution and tensile behavior of a balanced Al−Mg−Si alloy were investigated using the optical microscope,scanning electron microscope,X-ray diffraction,electron probe microanalyzer,differential scanning calorimetry,electrical conductivity test,and tensile test.The results show that Mg_(2)Si andβ-AlFeSi are the main intermetallic compounds in the as-cast structure,and Mg solute microsegregation is predominant inside the dendrite cell.The prediction of the full dissolution time of Mg_(2)Si by a kinetic model is consistent with the experiment.Theβ-AlFeSi in the alloy exhibits high thermal stability and mainly undergoes dissolution and coarsening during homogenization at 560℃,and only a small portion is converted toα-AlFeSi.The optimal homogenization parameters are determined as 560℃and 360 min,when considering the evolution of microstructure and resource savings.Both the strength and ductility of the alloy increased after homogenization.采用金相显微镜、扫描电镜、X射线衍射、电子探针、差示扫描量热仪、电导率测试和拉伸测试,研究均匀化参数对平衡Al-Mg-Si合金组织演变和拉伸行为的影响。结果表明,Mg_(2)Si和β-AlFeSi是铸态组织中的主要金属间化合物,枝晶内主要存在Mg的溶质偏析。动力学模型对Mg_(2)Si颗粒完全溶解时间的预测与实验结果一致。合金中的β-AlFeSi具有高的热稳定性,在560℃进行均匀化时主要发生溶解和粗化,仅少量转变为α-AlFeSi。综合考虑到组织演变和资源节约,确定最优均匀化制度为560℃和360 min。均匀化后合金的强度和塑性均有所提高。

关 键 词：Al−Mg−Si alloy HOMOGENIZATION kinetic model Fe-bearing phase tensile behavior 

分 类 号：TG146.21[一般工业技术—材料科学与工程]