Effect of platform temperature on microstructure and corrosion resistance of selective laser melted Al-Mg-Sc alloy plate

作     者：LI Meng-jia LIAN Juan CAO Ling-fei SHI Yun-jia ZHANG Guo-peng WANG Jie-fang ROMETSCH Paul 李梦佳;连娟;曹玲飞;史运嘉;张国鹏;王杰芳;ROMETSCH Paul

作者机构：School of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001China Key Laboratory of Material Physics of Ministry of EducationSchool of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450052China College of Materials Science and EngineeringChongqing UniversityChongqing 400044China Arvida Research and Development CenterRio Tinto AluminumQC G7S 4K8Canada Department of Materials Science and EngineeringMonash UniversityClaytonVIC 3800Australia 

出 版 物：《Journal of Central South University》 (中南大学学报（英文版）)

年 卷 期：2022年第29卷第3期

页      面：999-1014页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：Project(51901207) supported by the National Natural Science Foundation of China Project(2018M632796) supported by the China Postdoctoral Science Foundation Projects(19A430024, 21A430037) supported by the Plan of Henan Key Scientific Research Project of Universities,China 

主　　题：selective laser melting aluminum alloys microstructure corrosion resistance platform temperature 

摘      要：The Al-3.40Mg-1.08Sc alloy plates were manufactured by selective laser melting(SLM) at platform temperatures of 35 ℃ and 200 ℃, respectively, and the corrosion performance of them was studied along height direction. The results show that the corrosion resistance of the alloy plate built at platform temperature of 35 ℃ along height direction is basically the same due to a uniform microstructure;While the corrosion resistance of the alloy plate built at platform temperature of 200 ℃ along height direction is different. The evolution of microstructure and the distribution of secondary phases are investigated, and the results show that the Cu-rich phases in alloy play a key role on corrosion performance. At higher platform temperature, the cooling rate is relative slow and a certain degree of in situ ageing leads to the significantly different distribution of Cu-rich phases along grain boundary. Specimens built at the platform temperature of 200 ℃ are inclined to locate at the crossed grain boundary, rather than continuous segregation of Cu-rich phases along grain boundary that is built at platform temperature of 35 ℃. Therefore, the corrosion resistance of Al-3.40Mg-1.08Sc alloy plate manufactured at platform temperature of 200 ℃ is higher, and presents a gradually decreasing trend along height direction.