Effects of Pre-Strain on Bake Hardenability and Precipitation Behavior of Al-Mg-Si Automotive Body Sheets  

作　　者：Guanjun Gao Lizhen Yan Xiwu Li Guanjun Gao;Lizhen Yan;Xiwu Li(State Key Laboratory of Non-Ferrous Metals and Processes, China GRINM Group Co., Ltd., Beijing, China;GRIMAT Engineering Institute Co., Ltd., Beijing, China;General Research Institute for Nonferrous Metals, Beijing, China)

机构地区：[1]State Key Laboratory of Non-Ferrous Metals and Processes, China GRINM Group Co., Ltd., Beijing, China [2]GRIMAT Engineering Institute Co., Ltd., Beijing, China [3]General Research Institute for Nonferrous Metals, Beijing, China

出　　处：《Journal of Materials Science and Chemical Engineering》2024年第7期53-64,共12页材料科学与化学工程（英文）

摘　　要：The study investigates the effects of pre-strain on the bake hardenability and precipitation behavior of Al-Mg-Si automotive body sheets. The scanning electron microscopy, transmission electron microscopy, tensile test, Vickers hardness test, and differential scanning calorimetry were conducted for the purpose. It was found that the pre-strain treatment partially inhibits the natural aging hardening effect but cannot completely eliminate it. The pre-straining significantly enhances the bake hardening effect, with the 5% pre-strain sample showing the highest increase in yield strength and hardness. The formation of fine β" precipitates and dislocation structures contribute to the observed strengthening. Additionally, the study highlights the importance of optimizing pre-strain levels to achieve the best balance between strength and ductility in bake-hardened aluminum alloys.The study investigates the effects of pre-strain on the bake hardenability and precipitation behavior of Al-Mg-Si automotive body sheets. The scanning electron microscopy, transmission electron microscopy, tensile test, Vickers hardness test, and differential scanning calorimetry were conducted for the purpose. It was found that the pre-strain treatment partially inhibits the natural aging hardening effect but cannot completely eliminate it. The pre-straining significantly enhances the bake hardening effect, with the 5% pre-strain sample showing the highest increase in yield strength and hardness. The formation of fine β" precipitates and dislocation structures contribute to the observed strengthening. Additionally, the study highlights the importance of optimizing pre-strain levels to achieve the best balance between strength and ductility in bake-hardened aluminum alloys.

关 键 词：Al-Mg-Si Alloy PRE-STRAIN Bake Hardenability Precipitation Behavior CLUSTERS 

分 类 号：TG1[金属学及工艺—金属学]