Effect of the Cross Accumulative Roll Bonding on the Corrosion Behaviour of AA6082/AA7204 Composite Sheets
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Effect of the Cross Accumulative Roll Bonding on the Corrosion Behaviour of AA6082/AA7204 Composite Sheets Manfa Yuan1,2 · Yunlai Deng2,3 · Sen Lin3 · Xiaobin Guo3 · Yuankang Xie2,3 Received: 11 June 2020 / Accepted: 19 August 2020 © The Korean Institute of Metals and Materials 2020
Abstract In this work, Al–Mg–Si/Al–Zn–Mg laminated composite sheets were successfully produced first time by combining AA6082 and AA7204 sheets through the cross accumulative roll bonding process. Two different starting materials were rolling bonded as alternate layers up to 8 rolling cycles with 408 °C pre-heating for 20 min before each cycle. In-situ corrosive surface was characterized by the electron backscattered diffraction to study the relationship between the grain orientation and the corrosion behavior of Al–Mg–Si/Al–Zn–Mg composite sheets. 78.2% of the volume fraction of S-type ({123} ) texture, 46.0% of R-Cubic-type ({001} ) texture and 18.8% of Brass-type ({110} ) texture reduced during in situ corrosive tests. Corrosion results indicated that the excellent corrosion resistance mainly contributed from grains near Brass-type texture ({110} ). As the volume fraction of the Brass-type ({110} ) texture distributed in the Al–Zn–Mg alloy around the interface increased from 0.18 to 4.16% with the rolling reduction increased from 93.7 to 99.2%, the corrosion resistance of the laminated rolling material improved. Keywords Metallic composites · Corrosion · Interfaces · Texture
1 Introduction Lightweight design and application of materials reveal the great potential of carbon dioxide emissions and reducing fuel consumption. At present, one method is to promote the application of 7xxx series aluminum alloy in vehicle body. However, the poor corrosion behavior properties of this alloy becomes a limitation for application [1, 2]. Another strategy for the application of lightweight materials, such as high-strength aluminum materials, is using the accumulative roll bonding (ARB), which is a relatively simple method of generating ultra-fine grains (UFG) sheets or multi-layered composites structures by accumulating large strains. In addition, the technology of ARB can produce multicomponent * Xiaobin Guo [email protected] 1
Light Alloy Research Institute, Central South University, Changsha 410083, China
2
State Key Laboratory of High Performance and Complex Manufacturing, Central South University, Changsha 410083, China
3
School of Materials Science and Engineering, Central South University, Changsha 410083, China
materials by cladding of different aluminum alloys, these sandwich-like structures allow the desired properties of the materials involved to be combined, which opens up new possibilities for designing of lightweight materials [3–5]. ARB can successfully made sub-micron or nano scale alloy plates and metal matrix composites, so as to improve the hardness, yield strength, strain rate sensitivity and fatigue resistance [6–8]. The results of the cross accumulative roll bonding (CARB) process reported in the liter
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