Study on Interfacial Phenomena in Aluminum–Aluminum Bimetal Fabricated by Extrusion at Different Temperatures
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.
Keywordsbimetal bonding strength interface microstructure oxide film
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.
- 11.S. Meenia, F. Khan, S. Babu, R.J. Immanuel, S.K. Panigrahi, and G.D. Janakiram, Particle Refinement and Fine-Grain Formation Leading to Enhanced Mechanical Behaviour in a Hypo-Eutectic Al-Si Alloy Subjected to Multi-pass Friction Stir Processing, Mater Charact, 2016, 113, p 134–143CrossRefGoogle Scholar
- 23.H. Ammar, Quality of Aluminum-Silicon Casting Alloys, LAP LAMBERT Academic Publishing, Saarbrücken, 2012Google Scholar
- 28.B.M. Afshari, S.S. Mirjavadi, Y.A. Dolatabad, M. Aghajani, M.K.B. Givi, M. Alipour et al., Effects of Pre-deformation on Microstructure and Tensile Properties of Al-Zn-Mg-Cu Alloy Produced by Modified Strain Induced Melt Activation, Trans Nonferr Metals Soc of China, 2016, 26, p 2283–2295CrossRefGoogle Scholar
- 33.S. Jiao, J. Dong, M. Zhang, and L. Zheng, Influencing Factors and Bonding Mechanism of Hot Rolling Bonded Bimetals, Mater Rev, 2009, 23, p 59–62Google Scholar