(西北有色金属研究院 陕西省医用金属材料重点实验室，西安 710016)
摘 要: 采用等离子烧结(SPS)预合金粉末法制备了Ti-25Nb-3Zr-3Mo-2Sn(质量分数，%)(TLM)医用β型钛合金，研究TLM预合金粉末的特征和SPS制备的TLM合金在固溶时效后的组织形貌与力学性能。结果表明：等离子旋转电极法制备的TLM钛合金预合金粉末球形度好、内部致密度高，粉末凝固组织主要由细小枝晶和单晶构成。SPS制备的TLM合金其烧结态和固溶态组织为等轴β相及少量的球状α″马氏体。固溶态合金展示了良好的综合力学性能，其屈服强度约为500 MPa，抗拉强度为624 MPa，伸长率为40%，弹性模量为54.5 GPa。经500 ℃时效6 h后，合金在一定塑性的前提下，抗拉强度达到1015 MPa，弹性模量为84 GPa。
关键字: 医用β钛合金；预合金粉末；放电等离子烧结；组织形貌；力学性能
（Shaanxi Key Laboratory of Biomedical Metal Materials, Northwest Institute for Nonferrous Metal Research, Xi’an 710016, China）
Abstract:A biomedical β-Ti alloy Ti-25Nb-3Zr-3Mo-2Sn (mass fraction, %) was fabricated by spark plasma sintering (SPS). The characteristics, morphology and mechanical properties of TLM prealloyed powder after solid solution and aging were investigated. The results show that TLM prealloyed power prepared by plasma rotating electrode process has good spherical shape and high internal density. The solidification microstructure is consisted by small dendritic and single crystal. The sintered and as-soluted microstructures of TLM alloy propared by SPS method are equiaxed β phase and α″ martensite. The as-soluted alloy exhibits good comprehensive mechanical preperties with yield strength of 500 MPa, tensile strength of 624 MPa, elongation of 40% and elastic modulus of 54.5 GPa. Ageing at 500 ℃ for 6 h, after a superior the alloy has good plasticity, tensile strength reaches up to 1015 MPa, and the elastic modulus is 84 GPa.
Key words: medical β titanium alloy; prealloyed powder; spark plasma sintering; microstructure; mechanical property
