Improved mechanical proprieties of "magnesium based composites" with titanium-aluminum hybrids

In this study, the effect of micron-sized titanium and aluminum addition on the microstructural, mechanical and work-hardening behavior of pure Mg is investigated. Pure Mg reinforced with 10% Ti and 10% Ti-1% Al particulates were synthesized through semi-powder metallurgy route followed by hot extrusion. Semi-powder metallurgy appears to be promising approach for the synthesis of Mg based composite, as it is free of ball milling. Tensile results indicate that the direct addition of micron-sized 10wt.% titanium particulates to pure Mg, caused an improvement in elastic modulus, 0.2% yield strength, ultimate tensile strength, and failure strain (vertical bar 72%; vertical bar 41%; vertical bar 29%; and vertical bar 79% respectively). The addition of micron-sized 10wt.% titanium particles along with 1.0wt.% Al particles to pure Mg, resulted in an enhancement in elastic modulus, 0.2% yield strength, ultimate tensile strength, and failure strain (+74%; +56%; +45%; and +241% respectively). Besides tensile test, Vickers hardness and work-hardening behavior of prepared composites were also examined. Impressive failure strain of Mg-10Ti-1Al composite can be attributed to the better compatibility of Ti particulates with Mg due to presence of alloying element Al. Copyright 2015, National Engineering Research Center for Magnesium Alloys of China, Chongqing University. Production and hosting by Elsevier B.V. All rights reserved.