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Acta Metall Sin  2017, Vol. 53 Issue (2): 220-226    DOI: 10.11900/0412.1961.2016.00168
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Interface Characterization of the Mg/Al Laiminated Composite Fabricated by Accumulative Roll Bonding at Ambient Temperature
Hai CHANG1(),Mingyi ZHENG2,Guenter Brokmeier Heinz3,Weimin GAN4
1 National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083, China
2 School of Materials, Harbin Institute of Technology, Harbin 150001, China
3 Institute of Materials Science and Engineering, Clausthal Unviersity of Technology, Clausthal-Zellerfeld D38678, Germany
4 Helmholtz-Zentrum Geesthacht, Out Station at FRM2, Garching 85747, Germany
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Abstract  

Mg and its alloy have large potential in weight reduction usages because of their low density. However, the relatively low strength and modulus hinder their widely applications. Accumulative roll bonding (ARB) is one kind of severe plastic deformation (SPD) process which can produce bulk ultra-fine-grained (UFG) metallic materials. In order to improve the strength, elastic modulus and corrosion resistance of Mg sheet, accumulative roll bonding was utilized to fabricate UFG Mg/Al laminated composites at ambient temperature in this work. Synchrotron radiation-based computer tomography, SEM and TEM were employed to characterize the global bonding condition and the interface structure of Mg/Al lam inated sheet ARBed after 3 cycles. No obvious cracks could be observed along the bonding interfaces during ARB, although small amount of tiny pores existed in some area. Mg17Al12 phase with thickness of 150 nm formed at Mg/Al interface after 3 cycles. There existed a definite orientation relationship between Mg17Al12 and Mg which is [11?1?]Mg17Al12//[12?10]Mg, (110)Mg17Al12//(1?011?)Mg. Nevertheless, the orientation relationship between Mg17Al12 and Al is not very obvious.

Key words:  accumulative roll bonding      Mg/Al laminated composite      global bonding condition      interface structure      orientation relationship     
Received:  03 May 2016     
Fund: Supported by National Natural Science Foundation of China (Nos.51201006 and 51071057) and Programme of Introducing Talents of Discipline to Universities (No.B12012)

Cite this article: 

Hai CHANG,Mingyi ZHENG,Guenter Brokmeier Heinz,Weimin GAN. Interface Characterization of the Mg/Al Laiminated Composite Fabricated by Accumulative Roll Bonding at Ambient Temperature. Acta Metall Sin, 2017, 53(2): 220-226.

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https://www.ams.org.cn/EN/10.11900/0412.1961.2016.00168     OR     https://www.ams.org.cn/EN/Y2017/V53/I2/220

Fig.1  Schematic of the accumulative roll bonding (ARB) processing for Mg/Al composite
Fig.2  SEM images of longitudinal cross-section of ARBed Mg/Al composite(a) sandwich (b) 1 cycle (c) 2 cycle (d) 3 cycle
Fig.3  SEM images and EDS line scan analyses across the Mg/Al interface(a) sandwich (b) 1 cycle (c) 2 cycle (d) 3 cycle
Fig.4  Synchrotron computer tomography slices along the transverse direction of the sheet ARBed for 3 cycles (Arrows indicate small pores and local cracks along the bonding interfaces)
Fig.5  Low (a) and high (rectangular in Fig.5a) (b) magnified TEM images of the Mg/Al interface ARBed for 3 cycles at room temperature, and EDS analyses of the points A (c), B (d) and C (e) in Fig.5b
Fig.6  HRTEM image and SAED pattern (inset) of the area 1 in Fig.5b
Fig.7  HRTEM image of the Mg17Al12/Mg interface (area 2 in Fig.5b) (a), and corresponding FFT patterns of the upper (b) and lower (c) square regions in Fig.7a (Arrows in Fig.7a indicate the atomic plane misfits, arrows in Fig.7b indicate the (110) diffraction patterns of Mg17Al12)
Fig.8  HRTEM image of the Mg17Al12/Al interface (area 3 in Fig.5b) (a), and corresponding FFT patterns of the upper (b) and lower (c) square regions in Fig.8a (d0~d3—planar distances of possible lattice planes)
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