Ti-Zr-Cu-Co-Sn-Si块体非晶合金的形成及生物腐蚀行为和力学性能

Formation,Bio-corrosion Behavior and Mechanical Properties of Ti-Zr-Cu-Co-Sn-Si Bulk Metallic Glasses

采用铜模铸造法制备了不含高生物毒性元素Ni和Be及贵金属元素的生物医用型Ti87-xZr7.5CuxCo2.5Sn2Si1（x=39,40,42,原子分数/%）块体非晶合金,并对其非晶形成能力、热稳定性、生物腐蚀行为及力学性能进行了研究。结果表明：该系非晶合金临界直径为2-3mm,并具有较高的热稳定性,其过冷液体温度区间为44-51K。Ti-Zr-Cu-Co-Sn-Si非晶合金在模拟人体体液环境中表现出高耐腐蚀性能,在37℃的磷酸盐缓冲溶液中发生自钝化,钝化电流密度低,且其开路电位和孔蚀电位随着Ti含量的增加而提高。该系非晶合金具有良好的力学性能,压缩断裂强度达2309MPa,弹性模量为92-100GPa。

Novel Ti87-xZr7.5CuxCo2.5Sn2Si1（x=39,40,42,atom fraction/%）bulk metallic glasses without highly toxic elements Ni and Be as well as noble elements were synthesized by copper mold casting,and their glass-forming ability,thermal stability,bio-corrosion behavior and mechanical properties were studied.The results show that the Ti-Zr-Cu-Co-Sn-Si metallic glasses possess high glass-forming ability and thermal stability,evidenced by the critical diameters of 2-3mm and large supercooled liquid region of 44-51K.The Ti-Zr-Cu-Co-Sn-Si metallic glasses exhibit high bio-corrosion resistance in phosphate buffered saline（PBS）at 37℃.They are spontaneously passivated with wide passive region and low passive current density of about 3×10^-2 A/m^2.The corrosion resistance is enhanced with the increase in Ti content in the metallic glass.The Ti-based bulk metallic glasses possess high compressive fracture strength up to 2309MPa and low elastic modulus of 92-100GPa.