Microstructural evolution and mechanical properties of a novel biomedical Ti-6Zr-4Fe alloy during solution and aging treatment

Microstructural evolution and its effect on microhardness and Young's modulus of Ti-6Zr-4Fe alloy solution and aging treated at different temperatures were studied. The a phase transformed into b phase completely at 860 degrees C, meanwhile, the athermal u phase was found at 860 degrees C and it resulted in a higher Young's modulus. The u phase content increased from 250 degrees C to 400 degrees C, and the content decreased with further increase of aging temperature, there were only a phase and b phase at 600 degrees C. The phase transformation sequence was b-> u + b-> u+a+b-> a+b during aging treatment. The microhardness increased from 315 HV to 492 HV due to the element solution strengthening and phase transformation strengthening. The peak microhardness of Ti-6Zr-4Fe alloy aged at 400 degrees C reached 652 HV. The formation of u phase resulted in the increase of microhardness and Young's modulus in Ti-6Zr-4Fe alloy. (c) 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

Automated summary

The microstructural evolution of Ti-6Zr-4Fe alloy solution and aging treated at different temperatures was investigated, and its effects on microhardness and Young's modulus were studied. The formation of the θ phase resulted in an increase in microhardness and Young's modulus in the alloy.