第22卷第4期 2014年8月
材料科学与工艺
MATERIALS SCIENCE & TECHNOLOGY
Vol. 22No. 4 Aug.2014
热处理对Ti35Nb3.7Zr1.3Mo合金的组织与性能影响
王煜，戴世娟，陈锋，余新泉，张友法
（东南大学材料科学与工程学院江苏省先进金属材料高技术研究重点实验室，南京211189）
摘要：依据钛合金相关设计理论设计了低弹性模量、中高强度、良好塑性的新型生物医用近β型Ti35Nb3.7Zr1.3Mo合金，研究了固溶温度和时效温度对合金组织和力学性能的影响。结果表明：随着固溶温度的升高，α相逐渐溶解，合金的强度和弹性模量尚未发生明显变化。在低温时效时析出脆性相；随着时效温度升高，逐渐析出α相，且α相逐渐粗化；合金的强度与弹性模量先升高，达到峰值后下降；延伸率先降低后升高。合金经750℃固溶和450℃时效后综合力学性能优良，可以满足生物植入材料力学性能的要求。
关键词：Ti35Nb3.7Zr1.3Mo；固溶时效；显微组织；力学性能
中图分类号：TG166.5
文献标志码：A
文章编号：1005-0299(2014)04-0108-05
Influence of heat treatment on microstructure and mechanical properties of Ti35Nb3.7Zr1.3Mo alloy
WANGYu,DAIShijuan,CHENFeng,YUXinquan,ZHANGYoufa
( School of Materials Seience and Engineering, Southeast University, Jiangsu Key Laboratory of
Advanced Metallie Materials, Nanjing 211189, China)
Abstract: A new β-type alloy Ti35Nb3.7Zrl.3Mo for biomedical implant with low Young's modulus, high tensile strength and good plasticity was designed based on related design theory of titanium alloy. The influence of solid solution and aging temperature on microstructures and mechanical properties were investigated. It was found that α phase was dissolved in β matrix gradually with the increasing of solution temperature and the strength and elastic modulus have no significant change. The phase precipitates when aged at low temperature, while α phase precipitates and becomes coarse gradually when the aging temperature increases With the increasing of aging temperature, the strength and Young's modulus of the alloy increase first to the peak and then decrease, while the elongation of the alloy decreases first and then increases. The alloy processed by 750 C ×30 min solution treatment and 450 C × 12 h aging possesses excellent integrated
mechanical properties and can meet the requirement for the mechanical properties of implant materials. Keywords: Ti35Nb3.7Zr1.3Mo; solution treatment and aging; microstructure; mechanical properties
钛及其合金具有良好的生物相容性和力学性能，广泛用作生物植人体材料.纯钛与TC4（Ti6A14V）是目前应用最广泛的生物体种植材料，但弹性模量均在110GPa左右，远高于人骨的弹性模量（3~35GPa）［,2]；而TC4中含有细胞毒性元素V和Al.生物相容性受到限制.当今，设计
收稿日期：2012-09-05.
基金项目：航空科学基金资助项目（20133069014）作者简介：王煜（1989-），男，硕士生
通信作者：陈锋，E-mail：fengchen@seu.edu.cn
和开发具有低弹性模量和良好生物相容性的β 钛合金已成为医用钛合金材料开发的重点.大量的实验表明，Nb、Sn、Zr、Ta和Mo等元素具有较好的生物相容性，对身体具有较小的毒性[3]，因而由这些元素构成的低弹性模量β钛合金具有较大的应用潜力，
作为植人体的医用钛合金应满足以下原则4：(1)不含对人体有害的合金元素，具有良好的生物相容性；（2)与人体皮质骨更为匹配的许可应变和弹性模量，具有良好的生物力学相容性，具有の