High Strain Rate Superplasticity of TiN Particulate Reinforced Aluminum Composites

摘要

High strain rate superplasticity (HSRS) is an efficiently near-net shape forming to apply metal matrix composites (MMC) to automobile components, semi-conductor packing, structures in aerospace industry and even for housings in IT industry. The objectives of this study is to investigate the effect of matrix alloy elements on the HSRS in TiN particulate reinforced aluminum composites and to discuss the superplastic deformation mechanism of the HSRS composite. TiN/1N90 produced a m value of about 0.4 and total elongation of 200% at strain rate of about 10{sup}(-2)s{sup}(-1) and at 928K which is below liquid temperature of 1N90 pure aluminum. And TiN/2014 and TiN/2017 Al composite with Vf = 0.15 exhibited a m value of about 0.4 at strain rates higher than 10{sup}(-1)s{sup}(-1) and maximum tensile elongation of about 200～350% at a strain rate of about 3×10{sup}(-1)s{sup}(-1) at 818k which was above the solid temperature of matrix. However, the total elongation of the TiN/2014 is larger than that of the TiN/2017 and amount of Mg included to 2014Al is larger than that of 2017Al so that Mg is thought to have an effect on total elongation of TiN/Al composites. However, TiN/Al-1Mg indicates the total elongation less than 100% which means that 1wt%Mg has not positive effect on improving total elongation of TiN/Al composites.