Interface of ultrafine grained Al/Mg multilayered disks prepared by high pressure torsion

Qiao, Xiaoguang, Zhang, Xingyu, Zheng, Mingyi, Xu, Chao, Chen, Ying, Gao, Nong and Starink, Marco J (2016) Interface of ultrafine grained Al/Mg multilayered disks prepared by high pressure torsion. Thermec 2016: International Conference on Processing & Manufacturing of Advanced Materials, Graz, Austria. 28 May - 02 Jun 2016.

Abstract

Al alloys and Mg alloys are the two lightest metallic structural materials. Apart from the low density and the corresponding high specific strength and specific modulus, Al alloys possess a high thermal conductivity, electrically conductivity and corrosion resistance; whilst pure Mg is one third lighter than pure Al and has good damping capacity. Al/Mg multilayered materials, when processed to obtain sound interfaces, may combine the advantages of both Al and Mg and find many applications in industry. In this paper, commercially pure Al and Mg were employed to fabricate ultrafine grained Al/Mg multilayered composites by high pressure torsion (HPT) at room temperature. The bonding quality was examined by OM, SEM+EBSD and FIB+TEM. Vacancy concentration was characterized by positron annihilation. Hardness distribution in the cross section of the interface was characterized by micro-Vickers hardness and Nano-indentation. A thin layer of Mg17Al12 was observed at the interface of Mg/Al disks in contrast to a very thick layer of Al3Mg2 and a relatively thin layer of Mg17Al12 at the interface of diffusion-bonded Mg/Al at high temperatures.

This record has no associated files available for download.

Contributors

Author: Nong Gao

Download statistics