{"title":"Alloying addition-dependent bonding mechanisms in ultrasonic welding of pure Mg and AZ31 alloy to steel","authors":"Yun-Ta Chung , Zehao Li , Jhe-Yu Lin","doi":"10.1016/j.matchemphys.2025.130516","DOIUrl":null,"url":null,"abstract":"<div><div>This study examines how Al presence in magnesium alloys affects the bonding mechanism at the magnesium/steel interface in ultrasonic welding (USW). At the pure magnesium/steel interface, clustered oxides disrupt direct metal-to-metal contact, impairing bond integrity. In contrast, the AZ31B Mg alloy/steel interface demonstrated the continuous formation of nanoscale Fe–Al intermetallic compounds (IMCs), facilitating a cohesive and integrated bond. The difference in bonding mechanism enhanced the peak interfacial strength, which nearly doubled from 954 N to 1794 N. This finding unveiled the critical role of Al in Mg to react with Fe in promoting the formation of IMC, strengthening the interface in the USW of Mg/steel joints.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"334 ","pages":"Article 130516"},"PeriodicalIF":4.7000,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Materials Chemistry and Physics","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0254058425001622","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2025/2/7 0:00:00","PubModel":"Epub","JCR":"Q2","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
This study examines how Al presence in magnesium alloys affects the bonding mechanism at the magnesium/steel interface in ultrasonic welding (USW). At the pure magnesium/steel interface, clustered oxides disrupt direct metal-to-metal contact, impairing bond integrity. In contrast, the AZ31B Mg alloy/steel interface demonstrated the continuous formation of nanoscale Fe–Al intermetallic compounds (IMCs), facilitating a cohesive and integrated bond. The difference in bonding mechanism enhanced the peak interfacial strength, which nearly doubled from 954 N to 1794 N. This finding unveiled the critical role of Al in Mg to react with Fe in promoting the formation of IMC, strengthening the interface in the USW of Mg/steel joints.
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