Dynamic Young's Modulus and Mechanical Properties of Ti−Hf Alloys

Abstract

Ti−Hf alloys are expected to have lower modulus and higher strength than pure Ti since. Hf has been suggested to have the potential to enhance the strength and to reduce the Young's modulus of Ti alloys at the same time. In the present study, binary Ti−Hf alloys with Hf contents from 5 to 40 mass% were designed and fabricated. The effects of Hf content on the microstructures, dynamic Young's modulus and mechanical properties of Ti−Hf alloys were investigated with the aim of biomedical applications. The microstructures were examined using a scanning electron microscopy and an X-ray diffraction analysis. The experimental results indicate that all the studied Ti−Hf alloys exhibit lamellar HCP martensite (α′) structure under the given solution treatment, and increasing Hf content can gently reduce the Young's modulus but strongly enhance the strength of Ti−Hf alloys.