Cold bonding of Al/Mg disks through high pressure torsion

Qiao, X.G., Zhang, X.Y., Li, X, Chen, Y, Zheng, M.Y., Wu, K, Gao, N and Starink, M.J. (2015) Cold bonding of Al/Mg disks through high pressure torsion. 10th International Conference on Magnesium Alloys and Their Applications (Mg 2015), Jeju, Korea, Republic of. 10 - 15 Oct 2015.

Abstract

High performance multi-layered composites require selecting proper materials and processing techniques to achieve high quality in each layer of materials and forming reliable bonds at the atomic scale. In this paper, commercially pure Al and Mg are employed to fabricate ultrafine grained Al/Mg multilayered composites by HPT at room temperature. The bonding quality was examined by OM, SEM+EDS and FIB+TEM. Hardness distribution in the cross section of the interface was characterized by micro-Vickers hardness and Nano-indentation. Microstructure observation shows that tomography of the Al/Mg multilayered sheet is influenced by the accumulative strain and microstructure and texture of the materials in as-received condition. Nanoindentation test shows that hardness of interface of the Al/Mg multilayered sheet is higher than the Al and the Mg sheets. Examination by FIB and TEM reveals that a straight continuous layer of Mg17Al12 in thickness 200-300 nm formed on the interface of the Al and the Mg sheets during high pressure torsion.

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Contributors

Author: N Gao

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