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Study on Interfacial Phenomena in Aluminum–Aluminum Bimetal Fabricated by Extrusion at Different Temperatures

  • Junfeng Zhao
  • Qiulin Li
Article

Abstract

Aluminum–aluminum bimetal was prepared by spray-formed Al22Si alloy and ZL102 through extrusion process under solid–solid state, semisolid state and solid–liquid state. The microstructures and bonding strength of the bimetallic interface were studied, and the fracture behaviors of different bimetallic states were compared. The results showed that perfect metallic bond is produced through the semisolid extrusion process. The bimetal through solid–solid extrusion process is a large number of particles extruding through gaps among the cracked oxide layers, thus realized the metallurgical combination with the virgin metal. The process of semisolid extrusion is to break the oxide film under the temperature and pressure to achieve the bimetallic bonding. Besides, the hard particles wrapped by liquid metal can also enhance bonding strength. The tensile strength of bimetal fabricated by semisolid extrusion shows more promising results than that made by solid–solid combination and solid–liquid combination; the tensile strength improved from 83.3 to 120.5 MPa, an increase of about 45%. The process presented in this study provides a promising and effective approach for achieving Al22Si/Zl102 bimetal with high-quality metallurgical bonded interface.

Keywords

bimetal bonding strength interface microstructure oxide film 

Notes

Acknowledgments

This study was supported by the Joint Funds of National Natural Science Foundation of China under Grant No. U1530108. The authors sincerely acknowledge the anonymous reviewers for their insights and comments to further improve the quality of the manuscript.

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Copyright information

© ASM International 2019

Authors and Affiliations

  1. 1.Advanced Materials Institute, Graduate School at ShenzhenTsinghua UniversityShenzhenPeople’s Republic of China
  2. 2.Shenzhen Engineering Laboratory of Nuclear Materials and Service SafetyShenzhenPeople’s Republic of China

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