Design of near-Beta Ti-Zr-Mo-Cu multi-principal element alloys with low elastic modulus and enhanced corrosion resistance

Yusha Luo, Speaker at Materials and Nanotechnology Congress
PhD Student

Yusha Luo

Southeast University, China

Abstract:

Simultaneously achieving ultra-low elastic modulus, high corrosion resistance, and large plasticity of multi-principal element alloys has been a tremendous challenge for load-bearing metallic implant materials. Here, novel near-β alloys are developed via alloying xMo (x=6, 7, 8, 9, 13, 17 wt.%) into Ti-18Zr-10Cu prototype. The β-stabilizing 8Mo alloy, characterized by a low-modulus β-phase matrix and finely dispersed α’’-phase precipitates, achieves an elastic modulus of 60 GPa, compressive strength of ~1400 MPa, and plastic strain of 35%. This dual-phase microstructure synergistically balances strength and plasticity through β-phase strain accommodation and α’’-phase dislocation pinning, thereby circumventing the strength-ductility trade-off endemic to conventional β-Ti alloys. In addition, the 8Mo alloy displays good corrosion resistance, as revealed by low corrosion passive current density of 10-3 A/cm2 and high corrosion potential of ~ 0 V, which are attributed to the formation of passive film consisting of MoO4. This study provides an encouraging candidate for load-bearing implant materials due to their high corrosion resistance, large plasticity, and low elastic modulus which can help inhibit stress shielding.

Biography:

Yusha Luo is a Ph.D. candidate at Southeast University. Her research focuses on the microstructural design and processing of eutectic high-entropy alloys and biomedical titanium alloys, the control of metastable microstructures via additive manufacturing and the mechanical and corrosion properties of alloys and advances characterization techniques for local structures. She has contributed to over 5 research projects, including national key initiatives, NSFC general and key programs, key R&D plan projects. She has authored several publications in SCI-indexed journals.

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