Local melting mechanism and its effects on mechanical properties of friction spot welded joint for Al-Zn-Mg-Cu alloy

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英文篇名：Local melting mechanism and its effects on mechanical properties of friction spot welded joint for Al-Zn-Mg-Cu alloy 作者：Yunqiang ; Zhao ; Chungui ; Wang ; Jizhong ; Li ; Jinhong ; Tan ; Chunlin ; Dong 英文作者：Yunqiang Zhao;Chungui Wang;Jizhong Li;Jinhong Tan;Chunlin Dong;Guangdong Welding Institute (China-Ukraine E.O.Paton Institute of Welding); 英文关键词：Friction spot welding;;Numerical simulation;;Local melting;;Liquation crack;;Mechanical property 中文刊名：CLKJ 英文刊名：材料科学技术(英文版) 机构：Guangdong Welding Institute (China-Ukraine E.O.Paton Institute of Welding); 出版日期：2018-01-15 出版单位：Journal of Materials Science & Technology 年：2018 期：v.34 基金：supports by the Project of Guangdong Provincial Science and Technology Program(2015B090922011);; the 2017 GDAS’ Special Project of Science and Technology Development(2017GDASCX-0847);; the Project of Guangdong Provincial Key Laboratory(2012A061400011) 语种：英文; 页：CLKJ201801017 页数：7 CN：01 ISSN：21-1315/TG 分类号：189-195

摘要

Local melting and the eutectic film and liquation crack formation mechanisms during friction spot welding(FSp W) of Al-Zn-Mg-Cu alloy were studied by both experiment and finite element simulation. Their effects on mechanical properties of the joint were examined. When the welding heat input was high, the peak temperature in the stir zone was higher than the incipient melting temperature of the Al-Zn-Mg-Cu alloy. This resulted in local melting along the grain boundaries in this zone. In the retreating stage of the welding process, the formed liquid phase was driven by the flowing plastic material and redistributed as a "U-shaped" line in the stir zone. In the following cooling stage, this liquid phase transformed into eutectic films and liquation cracks. As a result, a new characteristic of "U" line that consisted of eutectic films and liquation cracks is formed in the FSp W join. This "U" line was located in the high stress region when the FSp W joint was loaded, thus it was adverse to the mechanical properties of the FSpW joint. During tensile shear tests, the "U" line became a preferred crack propagation path, resulting in the occurrence of brittle fracture.
        Local melting and the eutectic film and liquation crack formation mechanisms during friction spot welding(FSp W) of Al-Zn-Mg-Cu alloy were studied by both experiment and finite element simulation. Their effects on mechanical properties of the joint were examined. When the welding heat input was high, the peak temperature in the stir zone was higher than the incipient melting temperature of the Al-Zn-Mg-Cu alloy. This resulted in local melting along the grain boundaries in this zone. In the retreating stage of the welding process, the formed liquid phase was driven by the flowing plastic material and redistributed as a "U-shaped" line in the stir zone. In the following cooling stage, this liquid phase transformed into eutectic films and liquation cracks. As a result, a new characteristic of "U" line that consisted of eutectic films and liquation cracks is formed in the FSp W join. This "U" line was located in the high stress region when the FSp W joint was loaded, thus it was adverse to the mechanical properties of the FSpW joint. During tensile shear tests, the "U" line became a preferred crack propagation path, resulting in the occurrence of brittle fracture.

引文

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