Abstract
The aim of this study is to enhance the interfacial bonding strength of carbon nanotubes (CNTs)/AZ91 composites by heat treatment (HT). Ternary carbides (Al2MgC2) were in situ formed and uniformly dispersed between CNTs and AZ91 matrix by 823K heat treatment of CNTs/AZ91 composites for 12 h. In situ synthesized Al2MgC2 can strengthen the interfacial bonding of CNTs/AZ91 composites, and guarantee an effective load transfer between matrix and CNTs. The HT-CNTs/AZ91 composites showed outstanding mechanical properties due to the excellent interface enhancing effect of Al2MgC2. Compared with pure AZ91 alloy, HT-CNTs/AZ91 composites exhibit improved ultimate tensile strength and 0.2% yield strength by 7% and 22% respectively.
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