Inhomogeneity of microstructure and mechanical properties in radial direction of aluminum/copper friction welded joints
Inhomogeneity of microstructure and mechanical properties in radial direction of aluminum/copper friction welded joints
复制标题
铝/铜摩擦焊接头径向组织和力学性能的不均匀性
DOI：
10.1016/j.jmatprotec.2017.12.027
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发表时间：
2018
影响因子：
6.3
通讯作者：
Honggang Dong
中科院分区：
文献类型：
--
作者：
Longwei Pan;Peng Li;Xiaohu Hao;Jun Zhou;Honggang Dong
铝/铜摩擦焊接头中心位置试样的抗拉强度和伸长率最高，分别为88 MPa和20%。拉伸性能随金属间化合物沿着径向厚度的增加而降低。对于1/2 R和接头边缘位置的试样，断裂位置从中心向界面转移。经100 °C和250 °C热处理2 h后，中心位置的抗拉强度和伸长率均有所下降，断口分别为穿晶和小面状断口。在400 °C下热处理2 h后，在Al 2Cu和Al 4Cu 9之间形成AlCu金属间化合物层。断口中心位置出现网状结构，抗拉强度和伸长率显著下降。通过比较不同热处理条件下的所有断口，发现中心位置的断裂模式演化要比边缘位置的断裂模式演化提前。
The sample in center position of friction welded aluminum/copper joints has the highest tensile strength and elongation, which are 88 MPa and 20%, respectively. The tensile properties decrease with the increase of thickness of intermetallic compounds along radial direction. Fracture position transfers from aluminum side for samples from the center to the interface for samples from 1/2R and edge positions of joint. After heat treatment at 100 °C and 250 °C for 2 h, the tensile strength and elongation of samples in center position decrease and the fracture is with transgranular and faceted features, respectively. After heat treatment at 400 °C for 2 h, AlCu intermetallic compound layer forms between Al2Cu and Al4Cu9. Fracture morphology with net-like structure occurs in center position and the tensile strength and elongation decrease significantly. By comparing all fracture surfaces under different heat treatment conditions, the evolution of fracture mode in center position develops ahead of that in edge position.