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

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