Effects of a stainless steel interlayer on the interfacial microstructure and bonding strength of Cu/Al clad sheets prepared via the powder-in-tube method

Haitao Gao; Lin Wang; Shilei Liu; Jing Li; Charlie Kong; Hailiang Yu

Journal of Materials Research and Technology (Nov 2021)

Effects of a stainless steel interlayer on the interfacial microstructure and bonding strength of Cu/Al clad sheets prepared via the powder-in-tube method

Haitao Gao,
Lin Wang,
Shilei Liu,
Jing Li,
Charlie Kong,
Hailiang Yu

Affiliations

Haitao Gao: State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha, 410083, China; College of Mechanical and Electrical Engineering, Central South University, Changsha, 410083, China; Light Alloy Research Institute, Central South University, Changsha, 410083, China
Lin Wang: State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha, 410083, China; College of Mechanical and Electrical Engineering, Central South University, Changsha, 410083, China; Light Alloy Research Institute, Central South University, Changsha, 410083, China
Shilei Liu: State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha, 410083, China; College of Mechanical and Electrical Engineering, Central South University, Changsha, 410083, China; Light Alloy Research Institute, Central South University, Changsha, 410083, China
Jing Li: State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha, 410083, China; College of Mechanical and Electrical Engineering, Central South University, Changsha, 410083, China; Light Alloy Research Institute, Central South University, Changsha, 410083, China
Charlie Kong: Mark Wainwright Analytical Centre, University of New South Wales, Sydney, NSW, 2052, Australia
Hailiang Yu: State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha, 410083, China; College of Mechanical and Electrical Engineering, Central South University, Changsha, 410083, China; Light Alloy Research Institute, Central South University, Changsha, 410083, China; Corresponding author.

Journal volume & issue: Vol. 15
pp. 3514 – 3524

Abstract

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Cu/Al clad sheets with a 304 stainless steel foil (SUS304) interlayer are successfully fabricated by the powder-in-tube method. The influence of SUS304 thickness on the interfacial structure, elemental diffusion, and peeling strength of the clad sheets is studied. Experimental results indicate that the initial Cu/Al interface is partially transformed into a Cu/SUS304/Al interface after introducing the SUS304 interlayer. The proportion of SUS304 fragments at the bonding interface is shown to increase with thickness of the SUS304 interlayer. Differences in deformability between SUS304 interlayer and Cu/Al matrix promote the occurrence of shear deformation at the bonding interface via the cladding process, enhancing atomic diffusion at the Cu/SUS304/Al interface. Peeling tests reveal that interfacial cracks in clad sheets with an SUS304 interlayer propagate along the Cu/SUS304 and Cu/Al interfaces. Under combined effects of interfacial transfer and large shear strain, the interfacial strength of clad sheets is apparently improved. Clad sheets with the thickest SUS304 interlayer (30 μm) exhibit highest peeling strength (30.9 N/mm), demonstrating 73.6% improvement over clad sheets without an interlayer. These findings provide novel insights into the innovative design of clad sheets possessing extraordinary interfacial strength.

Published in Journal of Materials Research and Technology

ISSN: 2238-7854 (Print); 2214-0697 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Mining engineering. Metallurgy
Website: https://www.journals.elsevier.com/journal-of-materials-research-and-technology/

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