Interfacial microstructures and properties of aluminum alloys/galvanized low-carbon steel under high-pressure torsion |
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| Affiliation: | 1. Key Laboratory for Liquid-solid Structural Evolution and Processing of Materials, Ministry of Education, Shandong University, Jinan 250061, PR China;2. Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang 790-784, South Korea;3. College of Mechanical and Electronic Engineering, Shandong Agricultural University, Taian 271018, PR China;1. Center for Laser-Aided Manufacturing, Lyle School of Engineering, Southern Methodist University, 3101 Dyer Street, Dallas, TX 75205, United States;2. General Motors R&D Center, Warren, MI 48090-9055, United States;1. School of Materials Science and Engineering, Harbin Institute of Technology, Weihai 264209, China;2. Shandong Special Industry Group Co., LTD, Zibo 255201, China;3. Southwest Technology and Engineering Research Institute, Chongqing 400039, China;1. School of Material Science and Engineering, University of Science and Technology Beijing, Beijing 100083, PR China;2. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, PR China |
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| Abstract: | A new composite processing technology characterized by hot-dip Zn–Al alloy process was developed to achieve a sound metallurgical bonding between Al–7 wt% Si alloy (or pure Al) castings and low-carbon steel inserts, and the variations of microstructure and property of the bonding zone were investigated under high-pressure torsion (HPT). During hot-dipping in a Zn–2.2 wt% Al alloy bath, a thick Al5Fe2Znx phase layer was formed on the steel surface and retarded the formation of Fe–Zn compound layers, resulting in the formation of a dispersed Al3FeZnx phase in zinc coating. During the composite casting process, complex interface reactions were observed for the Al–Fe–Si–Zn (or Al–Fe–Zn) phases formation in the interfacial bonding zone of Al–Si alloy (or Al)/galvanized steel reaction couple. In addition, the results show that the HPT process generates a number of cracks in the Al–Fe phase layers (consisting of Al5Fe2 and Al3Fe phases) of the Al/aluminized steel interface. Unexpectedly, the Al/galvanized steel interface zone shows a good plastic property. Beside the Al/galvanized steel interface zone, the microhardnesses of both the interface zone and substrates increased after the HPT process. |
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| Keywords: | Aluminum alloys Low-carbon steel Hot-dipping Interface High pressure torsion |
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