Enhancing the bake-hardening responses of a pre-aged Al-Mg-Si alloy by trace Sn additions

作     者：Gang Lu Shuai Nie Jianjun Wang Ying Zhang Tianhai Wu Yujie Liu Chunming Liu Gang Lu;Shuai Nie;Jianjun Wang;Ying Zhang;Tianhai Wu;Yujie Liu;Chunming Liu

作者机构：Key Laboratory for Anisotropy and Texture of Materials(MoE)School of Materials Science and EngineeringNortheastern UniversityShenyang 110819China The State Key Laboratory of Rolling and AutomationNortheastern UniversityShenyang 110819China Research Center for Metallic WiresNortheastern UniversityShenyang 110819China Shenyang Industrial Transformation Upgrading Promotion CenterShenyang 110083China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2020年第40卷第5期

页      面：107-112页

核心收录：

学科分类：08[工学] 0817[工学-化学工程与技术] 0806[工学-冶金工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 0703[理学-化学] 080201[工学-机械制造及其自动化] 0801[工学-力学（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：financially supported by the National Key R&D Program of China(No.2018YFB2001800). 

主　　题：Al-Mg-Si alloy Pre-aging Trace Sn Bake-hardening responses Precipitation kinetics 

摘      要：Effects of additions of trace Sn on the bake-hardening responses of a pre-aged Al-0.85 Mg-0.85 Si(in wt%)alloy were investigated through mechanical tests,differential scanning calorimetry,electrical resistivity and transmission electron microscopy.Results indicate that trace Sn additions reduced the number density of pre-aging clusters by inhibiting the formation of unstable counterpart during pre-aging treatment,leading to low strength and high supersaturation of solute atoms.In a subsequent paint-bake treatment,the presence of highly supersaturated solute atoms and high concentrated free vacancies moderated the activation energy barrier ofβ’’phase and thus kinetically accelerated the formation ofβ’’.Consequently,the trace Sn additions enhanced the bake-hardening responses of the pre-aged alloys significantly.The Sn-containing pre-aged Al-Mg-Si alloys with low strength and great bake-hardening responses hold promising potential for automotive body skin applications.