添加Sn元素对Zr-16Nb-xTi (x=4 wt%，16 wt%)合金弹性模量及磁化率的影响

1 Introduction

Due to their superior mechanical properties, biomedical alloys, such as Ti-based alloys, are widely used in clinical medicine [1-6]. Biomaterials have been subjected to increasing performance demands in recent years, due to the constant improvement of medical standards and the rapid development of medical equipment. The most important requirements for innovative biomaterials are low elastic modulus and magnetic susceptibility, as well as biocompatibility [7]. Although several Ti-based alloys meet mechanical requirements, their high magnetic susceptibility and poor biocompatibility limit their application areas in clinical medicine [8-9]. As a result, in recent years, greater attention has been paid to Zr alloys, which have lower magnetic susceptibility and elastic modulus, as well as good biocompatibility, compared to Ti alloys [10-14]. However, there are only a few reports of Zr-based alloys that meet all of the above requirements. A major problem is that α″ martensite phase, which can significantly improve alloy performance, is rarely formed in Zr-Nb and Zr-Nb-Ti systems. OKABE et al [15] first reported α″ martensite phase in the Zr-Nb system with appropriate Sn addition. Furthermore, the addition of Sn has been reported to reduce the magnetic susceptibility of Zr-Nb alloy [13]. Recently, XUE et al [16] presented Zr-16Nb-xTi alloys with outstanding mechanical and magnetic properties, particularly in Zr-16Nb-4Ti and Zr-16Nb-16Ti, and the β+α′ phase constitution is well aligned with the key requirements. Inspired by their research, we explored the possibility of obtaining lower elastic modulus and magnetism by adding appropriate Sn, created Zr-16Nb-xTi-ySn (x=4 wt%, 16 wt%,  y=4 wt%, 6 wt%) alloys, measured their mechanical and magnetic properties, observed their microstructures, and established a correlation between Sn addition and elastic modulus, mechanical strength, as well as magnetic susceptibility of these alloys.