Ag/Ti 3AlC 2 Composites Prepared by Equal Channel Angular Pressing Followed by Heat Treatment

【Author】

WANG Dan-Dan;TIAN Wu-Bian;DING Jian-Xiang;MA Ai-Bin;ZHANG Pei-Gen;HE Wei;SUN Zheng-Ming

【Institution】

School of Materials Science and Engineering, Southeast University;School of Materials Science and Engineering, Southeast University;School of Materials Science and Engineering, Anhui University of Technology;College of Mechanics and Materials, Hohai University;School of Materials Science and Engineering, Southeast University;School of Materials Science and Engineering, Southeast University;School of Materials Science and Engineering, Southeast University

【Abstract】

Equal channel angular pressing (ECAP) followed by heat treatment was carried out to prepare Ag/Ti 3AlC 2 composites. The effects of heat treatment on the resistivities and mechanical properties of the Ag/Ti 3AlC 2 composites were investigated. Results show that ECAP effectively densifies the Ag/Ti 3AlC 2 compacts, and the layered Ti 3AlC 2 particles are delaminated and aligned due to the shearing effect during ECAP. Alignment of Ti 3AlC 2 particles resulted in the anisotropy of electrical and mechanical properties of the composites. Perpendicular to the alignment of Ti 3AlC 2 particles displayed high resistivity and compressive strength. Moreover, the resistivity and compressive strength increased with following heat treatment, yielding the maximum at 800 ℃. These increments were attributed to the enhanced interfacial reactions between Ag and Ti 3AlC 2 at high temperatures. The findings in this study indicate that densification and microstructural control of Ag/MAX composites can be achieved simultaneously by ECAP, while the following heat treatment can tailor their properties.

【Keywords】

equal channel angular pressing (ECAP);Ag/Ti 3AlC 2;alignment;heat treatment