Interfacial microstructure and shear strength of a Cu/Al bimetal fabricated by hot press welding

doi:10.12442/j.issn.1002-185X.20200380

Home > Archive>Volume 49, Issue 12, 2020 >4121-4128. DOI:10.12442/j.issn.1002-185X.20200380

Interfacial microstructure and shear strength of a Cu/Al bimetal fabricated by hot press welding
DOI:
                        10.12442/j.issn.1002-185X.20200380
                    
Author:
                        Juntao ZouJuntao Zou
Shaanxi Province Key Laboratory for Electrical Materials and Infiltration Technology,Xi’an University of Technology,Xi’an
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Lei GaoLei Gao
Shaanxi Province Key Laboratory for Electrical Materials and Infiltration Technology,Xi’an University of Technology,Xi’an
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Tingfang XieTingfang Xie
Shaanxi Province Key Laboratory for Electrical Materials and Infiltration Technology,Xi’an University of Technology,Xi’an
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Silin LiSilin Li
Shaanxi Province Key Laboratory for Electrical Materials and Infiltration Technology,Xi’an University of Technology,Xi’an
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Lixing SunLixing Sun
Shaanxi Province Key Laboratory for Electrical Materials and Infiltration Technology,Xi’an University of Technology,Xi’an
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Shuhua LiangShuhua Liang
Shaanxi Province Key Laboratory for Electrical Materials and Infiltration Technology,Xi’an University of Technology,Xi’an
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Affiliation:Shaanxi Province Key Laboratory for Electrical Materials and Infiltration Technology,Xi’an University of Technology,Xi’an
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Abstract:

Cu/Al bimetals were fabricated by diffusion welding (DFW) at welding temperatures ranging between 683 and 803 K, welding time between 20 and 80 min, and a welding pressure of 15 MPa. The scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) results of the Cu/Al interface showed that the width of interface layer gradually increased with increasing welding temperature and prolonged welding time. Following welding at 803 K for 80 min, intermetallic compounds (IMCs) of Al4Cu9, Al3Cu4, AlCu, and Al2Cu occurred at the Cu/Al interface from the copper side to the aluminum side. The IMCs occurred in the sequence of Al2Cu, AlCu, Al3Cu4, and Al4Cu9 . Shear test of Cu/Al bimetal showed brittle facture, and the interfacial strength increased with lower amount of IMCs. A maximum shear strength of the Cu/Al bimetal of 63.8 MPa was obtained following DFW at a welding temperature of 723 K for 20 min.

Key words:Cu/Al bimetal; Interfacial microstructure; Intermetallic compounds ; Shear strength

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[Juntao Zou, Lei Gao, Tingfang Xie, Silin Li, Lixing Sun, Shuhua Liang. Interfacial microstructure and shear strength of a Cu/Al bimetal fabricated by hot press welding[J]. Rare Metal Materials and Engineering,2020,49(12):4121~4128.]
DOI：10.12442/j. issn.1002-185X.20200380

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Received:June 02,2020
Revised:November 11,2020
Adopted:July 01,2020
Online: January 13,2021
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