Effects of Porosity and Re-HIP on Properties of Ti-6Al-4V Alloy from Atomized Powder

Ti-6Al-4V alloys of various densities were prepared by powder metallurgy (PM) using hot isostatic pressing (HIPing). The effects of porosity on mechanical properties of PM compacts have been investigated. It indicated that PM Ti-6Al-4V alloy exhibited a better performance by increase of relative density, especially for the tensile strength at 400 oC. Re-HIPing was used to assess the possibility for increasing the relative density of PM compacts with porosity defects in the first HIPing cycles. The results show that re-HIPing is an effective technique to heal porosity defects. The relative density of PM compacts with porosity can be significantly improved by re-HIPing.