Numerical simulation and experimental research of Cu/Al bimetallic composite rod fabricated by equal channel angular extrusion (ECAE)

doi:10.13251/j.issn.0254-6051.2023.10.045

Abstract

Abstract: Deformation behavior of Cu/Al bimetallic composite rod during ECAE process was simulated by DEFORM-3D finite element software. The distribution and variation laws of metal flow, extrusion load, effective strain and mean stress were investigated. Cu/Al bimetallic composite rod was successfully fabricated by 4 passes of equal channel angular extrusion (ECAE) process under B_C route at room temperature. The experimental load displacement curve was extracted and analyzed. The physical grid test and microhardness of the Cu/Al bimetallic composite rod were also tested. The comparison between flow net grid and physical grid shows that there is a severe shear deformation zone inside the Cu/Al bimetallic composite rod during ECAE process. The results show that the Cu/Al bimetallic composite billet gradually experiences from unstable deformation to uniform and coordinated deformation during ECAE process, the material is in an ideal three-dimensional compressive stress state with high hydrostatic pressure, and the metal at the interface is closely bonded. After 4 passes of ECAE, the deformation of Cu/Al bimetallic composite billet is relatively homogeneous in general, and the average accumulated effective strain is about 4.49. As the number of ECAE passes increases, the peak load continues to increase, and the microhardness of the composite billet continues to increase, but the increase in the cladding layer is greater than that of the core material.

Key words: equal channel angular extrusion (ECAE), copper aluminum bimetallic, finite element simulation, load curve, physical grid test

CLC Number:

TG376

Zhang Xiang, Wang Xiaoxi, Wang Haibo, Zhang Fei, Shi Fengjian. Numerical simulation and experimental research of Cu/Al bimetallic composite rod fabricated by equal channel angular extrusion (ECAE)[J]. Heat Treatment of Metals, 2023, 48(10): 291-296.

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