Energy absorption characteristics and preparation of porous titanium with high porosity
Jianzhong Wang, Aoyun Liu, Qingbo Ao, Chen Wu, Jun Ma, Peng Cao
Abstract
Porous titanium is a highly desirable and interesting material in combination with structural and functional characters, which makes it very attractive to industrial applications, such as chemical filter, gas diffusion layer, energy absorber, medical implant, catalyst carrier, etc. In the paper, porous titanium with the porosity higher than 58% was prepared by cold isostatic pressing (CIP) process adding space holder of NaCl. A systematic study has been conducted to understand the normalized energy absorption per unit volume and the energy absorption mechanism. Furthermore, the optimal choice of porous titanium for each relative density at the compressive strain rate of 10−3 s−1 was also identified based on the envelope of energy absorption diagram. The energy absorption property of porous titanium improves gradually as the strain increases at a constant porosity, while it drops rapidly with the porosity rising at a certain strain. Additionally, the porosity of as-prepared porous titanium should be less than 73.0% to absorb more energy. Moreover, the Young’s modulus and the plateau stress of porous titanium can be expressed in a power law of the relative density, and they are about proportional to (ρp/ρs)2.