Microstructure,properties and fracture analysis of FSW joints for Cu/Al dissimilar materials

WU Keyan; LIU Peng; SUN Siyu; HONG Chang; WANG Keqin

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Microstructure,properties and fracture analysis of FSW joints for Cu/Al dissimilar materials
Vol. 48, Issue 6, Pages: 68-72(2018)
Published：2018
DOI：
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DOI：

WU Keyan, LIU Peng, SUN Siyu, et al. Microstructure,properties and fracture analysis of FSW joints for Cu/Al dissimilar materials[J]. Eletric Welding Machine2018, 48(6): 68-72. DOI：

摘要

利用搅拌摩擦焊(FSW)实现紫铜(T2)与铝合金(5A06)的焊接。采用金相、拉伸试验机和扫描电镜研究Cu/Al接头的显微组织、力学性能和断裂特征。结果表明

当搅拌头转速950r/min、行走速度150mm/min时

可获得高质量的焊接接头

拉伸强度最大值约为296 MPa。金属铜和铝在焊核近铜侧呈层状交替结构特征

但在焊核区的铝侧为Cu和Al的混合结构特征。焊缝截面的宏观断裂表现出明显的层状特征

断裂中间层为具有韧性断裂特征的韧窝结构

韧窝中主要存在脆性Mg-Al系金属间化合物。

Abstract

Copper（T2） and aluminium alloy（5 A06） were welded by friction stir welding（FSW）.The microstructure

mechanical properties and fracture characterization of FSW joints were studied by metallography

tensile testing machine and scanning electron microscope（SEM）.The results indicated that the high quality weld joint could be obtained when tool rotational speed was 950 r/min

and travel speed was 150 mm/min.The maximum value of tensile strength was about 296 MPa.The metal Cu and Al close to copper side in the weld nugget（WN） zone showed a lamellar alternating structure characteristic.However

a mixed structure characteristic of Cu and Al existed in the aluminium side of weld nugget（WN） zone.Macroscopic fracture surfaces of the weld section showed obvious layered characteristic

and there were a lot of dimple structures of ductile fracture character in the middle layer of the fracture.The brittle Al-Cu-Mg intermetallic compounds of brittleness were found in the dimple.