Preparation and Properties of Porous Ti-Al Alloy

The porous Ti-Al alloys were prepared by powder metallurgy technique with elemental powder mixing,partial diffusion and reaction sintering.The effects of Al powder addition on phase structure,pore morphology,porosity,compressive properties and corrosion resistance of the alloy were investigated.The results show that the main equilibrium phase of the porous Ti-Al alloy is α-Ti and a small amount of Ti₃Al at the Al content of 5%～15%,and it has a closed pore structure with different sizes.The main equilibrium phase of the porous Ti-Al alloy is Ti₃Al and a small amount of TiAl at the Al content of 20%～30%,and it has an interpenetrating open-pore structure.As the Al content increases,the porosity of the alloy increases gradually,and the compressive strength decreases gradually,with the corrosion resistance increasing first and then decreasing.At the Al content of 20%,the porosity of the porous Ti-Al alloy is 26.7%,and the compressive strength is 63.9 MPa with the strongest corrosion resistance.