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Research Article

Interfacial bonding characteristics and mechanical properties of H68/AZ31B clad plate

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  • Received: 2 September 2020Revised: 16 November 2020Accepted: 11 December 2020Available online: 12 December 2020
  • Interfacial bonding, microstructures and mechanical properties of an explosively-welded H68/AZ31B clad plate were systematically studied. It was found that the bonding interface demonstrated a “like-wavy” structure containing three typical zones/layers: 1) diffusion layer adjacent to the H68 brass plate; 2) solidification layer of melted metals at the interface; and 3) a layer at the side of AZ31B alloy which experienced severe deformation. Mixed copper, CuZn2 and α-Mg phases were observed in the melted-solidification layer. Regular polygonal grains with twins were found at the H68 alloy side while fine equiaxed grains due to the recrystallization were found at the AZ31B alloy side near the interface. Nanoindentation results revealed the formation of brittle intermetallic CuZn2 phases at the bonding interface. The interface was bonded well through metallurgical reactions owing to the diffusion of Cu, Zn and Mg atoms across the interface and the metallurgic reaction of partially melted H68 and AZ31B alloys.
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Interfacial bonding characteristics and mechanical properties of H68/AZ31B clad plate

  • Corresponding author:

    Ting-ting Zhang    E-mail: zhangtingting@tyut.edu.cn

  • 1. Advanced Forming and Intelligent Equipment Research Institute, Taiyuan University of Technology, 030024 Taiyuan,China
  • 2. College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, 030024 Taiyuan, China
  • 3. College of Materials Science and Engineering, Taiyuan University of Technology, 030024 Taiyuan, China
  • 4. Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, 030024 Taiyuan, China
  • 5. Shanxi Key Laboratory of Advanced Magnesium-based Materials, Ministry of Education, 030024 Taiyuan, China

Abstract: Interfacial bonding, microstructures and mechanical properties of an explosively-welded H68/AZ31B clad plate were systematically studied. It was found that the bonding interface demonstrated a “like-wavy” structure containing three typical zones/layers: 1) diffusion layer adjacent to the H68 brass plate; 2) solidification layer of melted metals at the interface; and 3) a layer at the side of AZ31B alloy which experienced severe deformation. Mixed copper, CuZn2 and α-Mg phases were observed in the melted-solidification layer. Regular polygonal grains with twins were found at the H68 alloy side while fine equiaxed grains due to the recrystallization were found at the AZ31B alloy side near the interface. Nanoindentation results revealed the formation of brittle intermetallic CuZn2 phases at the bonding interface. The interface was bonded well through metallurgical reactions owing to the diffusion of Cu, Zn and Mg atoms across the interface and the metallurgic reaction of partially melted H68 and AZ31B alloys.

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