Superelastic properties of biomedical Ti–Zr–Nb–Sn highly porous shape memory alloys prepared by fiber metallurgy

Abstract

Artificial bone substitutes to satisfy the specific properties of cancellous bone for the repair of bone defects are highly desirable. In this study, combining the unique superelasticity and high porosity, biomedical Ti–Zr–Nb–Sn highly porous shape memory alloys (HPSMAs) were prepared by fiber metallurgy for the potential repair of damaged cancellous bone. Three-dimensional and open porous networks constructed by fiber-fiber bonds were obtained in the HPSMAs with a porosity of 79.5%. The recovery strain at room temperature was improved from 2.3% in the as-sintered specimen to 3.8% in the 700 °C solution-treated one by adjusting the transformation temperature. The mechanical performances in the Ti–Zr–Nb–Sn HPSMAs were similar to those of cancellous bone. Stable superelastic behaviors with a recovery strain of 4% were achieved at room temperature after cycle training. The Ti–Zr–Nb–Sn HPSMAs satisfy those specific properties of cancellous bone and show great potential in the repair of cancellous bone defects.