{"title":"时效与超声冲击复合处理7A52铝合金焊接接头表面纳米化","authors":"Chen Chao, Chen Furong, Zhang Huijing","doi":"10.1016/S1875-5372(18)30201-7","DOIUrl":null,"url":null,"abstract":"<div><p>Welding joint of 7A52 aluminum was treated by ultrasonic impact technology (UIT) and a combined treatment of aging and ultrasonic impact (A-UIT). The effects of different treatments on the microstructure and properties of the welded joint were compared and analyzed, especially the effects of A-UIT on microstructure and the mechanism of surface hardening of welded joint. The results show that the nanometer grain layer can be successfully prepared by UIT and A-UIT on the surface of aluminum alloy welded joint. From the comparison, it can be found that the surface grain size, surface microhardness and matrix microhardness of the welded joint after A-UIT are significantly higher than those of the welded joint after UIT, which exhibits a better reinforcement. The surface hardening mechanism of welded joints after UIT is fine-grained strengthening, while that of welded joints after A-UIT is fine-grained and precipitated strengthening, which is different from that of UIT.</p></div>","PeriodicalId":21056,"journal":{"name":"稀有金属材料与工程","volume":"47 9","pages":"Pages 2637-2641"},"PeriodicalIF":0.6000,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1875-5372(18)30201-7","citationCount":"11","resultStr":"{\"title\":\"Surface Nanocrystallization of 7A52 Aluminum Alloy Welded Joint by Aging and Ultrasonic Impact Compound Treatment\",\"authors\":\"Chen Chao, Chen Furong, Zhang Huijing\",\"doi\":\"10.1016/S1875-5372(18)30201-7\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Welding joint of 7A52 aluminum was treated by ultrasonic impact technology (UIT) and a combined treatment of aging and ultrasonic impact (A-UIT). The effects of different treatments on the microstructure and properties of the welded joint were compared and analyzed, especially the effects of A-UIT on microstructure and the mechanism of surface hardening of welded joint. The results show that the nanometer grain layer can be successfully prepared by UIT and A-UIT on the surface of aluminum alloy welded joint. From the comparison, it can be found that the surface grain size, surface microhardness and matrix microhardness of the welded joint after A-UIT are significantly higher than those of the welded joint after UIT, which exhibits a better reinforcement. The surface hardening mechanism of welded joints after UIT is fine-grained strengthening, while that of welded joints after A-UIT is fine-grained and precipitated strengthening, which is different from that of UIT.</p></div>\",\"PeriodicalId\":21056,\"journal\":{\"name\":\"稀有金属材料与工程\",\"volume\":\"47 9\",\"pages\":\"Pages 2637-2641\"},\"PeriodicalIF\":0.6000,\"publicationDate\":\"2018-09-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://sci-hub-pdf.com/10.1016/S1875-5372(18)30201-7\",\"citationCount\":\"11\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"稀有金属材料与工程\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S1875537218302017\",\"RegionNum\":4,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q4\",\"JCRName\":\"MATERIALS SCIENCE, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"稀有金属材料与工程","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1875537218302017","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
Surface Nanocrystallization of 7A52 Aluminum Alloy Welded Joint by Aging and Ultrasonic Impact Compound Treatment
Welding joint of 7A52 aluminum was treated by ultrasonic impact technology (UIT) and a combined treatment of aging and ultrasonic impact (A-UIT). The effects of different treatments on the microstructure and properties of the welded joint were compared and analyzed, especially the effects of A-UIT on microstructure and the mechanism of surface hardening of welded joint. The results show that the nanometer grain layer can be successfully prepared by UIT and A-UIT on the surface of aluminum alloy welded joint. From the comparison, it can be found that the surface grain size, surface microhardness and matrix microhardness of the welded joint after A-UIT are significantly higher than those of the welded joint after UIT, which exhibits a better reinforcement. The surface hardening mechanism of welded joints after UIT is fine-grained strengthening, while that of welded joints after A-UIT is fine-grained and precipitated strengthening, which is different from that of UIT.
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号
