(西北有色金屬研究院 陜西省醫(yī)用金屬材料重點(diǎn)實(shí)驗(yàn)室，西安 710016)
摘 要: 采用等離子燒結(jié)(SPS)預(yù)合金粉末法制備了Ti-25Nb-3Zr-3Mo-2Sn(質(zhì)量分?jǐn)?shù)，%)(TLM)醫(yī)用β型鈦合金，研究TLM預(yù)合金粉末的特征和SPS制備的TLM合金在固溶時效后的組織形貌與力學(xué)性能。結(jié)果表明：等離子旋轉(zhuǎn)電極法制備的TLM鈦合金預(yù)合金粉末球形度好、內(nèi)部致密度高，粉末凝固組織主要由細(xì)小枝晶和單晶構(gòu)成。SPS制備的TLM合金其燒結(jié)態(tài)和固溶態(tài)組織為等軸β相及少量的球狀α″馬氏體。固溶態(tài)合金展示了良好的綜合力學(xué)性能，其屈服強(qiáng)度約為500 MPa，抗拉強(qiáng)度為624 MPa，伸長率為40%，彈性模量為54.5 GPa。經(jīng)500 ℃時效6 h后，合金在一定塑性的前提下，抗拉強(qiáng)度達(dá)到1015 MPa，彈性模量為84 GPa。
關(guān)鍵字: 醫(yī)用β鈦合金；預(yù)合金粉末；放電等離子燒結(jié)；組織形貌；力學(xué)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
