Low modulus Ti-rich biocompatible TiNbZrTaHf concentrated alloys with exceptional plasticity

作者：Yang, C.; Yang, S. J.; Chen, L. Q.; Dong, H. K.; Duan, X. B.^*; Yu, C. Y.; Zhang, W. W.; Liu, L. H.^*

来源：Materials Research Letters, 2023, 11(7): 604-612.

DOI：10.1080/21663831.2023.2197942

• High-entropy alloy
• titanium alloy
• mechanical property

This study investigates the evolutions of microstructure and performance of TiNbZrTaHf-based alloys from equiatomic high-entropy alloys to Ti-rich dilute alloys. A novel biocompatible alloy, Ti50Nb12.5Zr12.5Ta12.5Hf12.5, was developed with a high yield strength of 839 +/- 12 MPa, low modulus of 61.5 GPa, low magnetic susceptibility of similar to 1.99x10(-6) cm(3) g(-1), and unprecedented tensile plasticity of 28.7 +/- 2.2%. The study discusses the underlying mechanisms responsible for these superior performances, attributing the exceptional plasticity to the activation of cross-slip dislocations, enhanced dynamic recovery and high resistance to crack propagation. The findings provide new insights into the development of biomedical titanium alloys. @@@ [GRAPHICS] @@@ .

• 单位
  武汉工程大学