材料科学
微观结构
极限抗拉强度
复合材料
接头(建筑物)
抗剪强度(土壤)
合金
箔法
焊接
图层(电子)
断裂(地质)
剪切(地质)
结构工程
工程类
环境科学
土壤科学
土壤水分
作者
Yuqing Mao,Jinkai Wang,Shaopeng Liu,Qing Peng,Jingxuan Li,Liming Ke
标识
DOI:10.1016/j.jma.2024.07.007
摘要
Friction stir lap welding (FSLW) was adopted to join successfully dissimilar AZ31B Mg alloy and TC4 Ti alloy with Sn foil addition of 30 µm thickness. Interfacial microstructure, tensile shear performances and bonding mechanism of the joints obtained using three different rotation speeds were studied. High-performance FSLW Mg/Ti dissimilar joints with maximum tensile shear strength of 593.3 N/mm were produced at 1180 r/min, and which was mainly attributed to ultrastrong reaction interlayer consisting of 125.9 nm thick (Mg2Sn+Mg) transition layer and discontinuous (Ti6Sn5+Ti3Al) IMCs layer with 6.58 nm thickness at the interface. The formation of the reaction interlayer was beneficial for high interfacial strength, resulting in significantly improving the joint strength. The fracture of all FSLW joints located on AZ31B Mg stirred zone adjacent to (Mg2Sn+Mg) transition layer or along the crack propagation direction of the AZ31B/TC4 interface with different fracture mechanisms, and which could be consistent with interfacial microstructure.
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