(北京工業(yè)大學(xué) 固體微結(jié)構(gòu)與性能研究所，北京 100124)
摘 要: 采用顯微硬度測試、X射線衍射分析和透射電子顯微鏡觀察等方法，研究不同熱處理后生物醫(yī)用Ti-35Nb-5Ta-7Zr合金和Ti-35Nb-7Zr合金的顯微硬度變化及微觀組織特征，揭示Ta元素的添加對合金微觀結(jié)構(gòu)、時效析出序列及性能的影響。結(jié)果表明：Ti-35Nb-5Ta-7Zr合金比Ti-35Nb-7Zr合金具有更明顯的時效強(qiáng)化效果；固溶處理(ST)后經(jīng)300和600 ℃時效處理，Ti-35Nb-5Ta-7Zr合金的時效析出順序可以描述為β+α″(ST) β+α β+α+等溫ω，而Ti-35Nb-7Zr合金的時效析出順序為β+α″+淬火ω(ST) β+α+等溫ω β+α；Ta元素的添加抑制固溶處理過程中淬火ω相的析出，提高時效過程中等溫ω相的析出溫度。
附件:25-p1195-14681
關(guān)鍵字: 生物醫(yī)用材料；醫(yī)用鈦合金；Ti-35Nb-5Ta-7Zr合金；Ti-35Nb-7Zr合金；時效；微觀結(jié)構(gòu)；顯微硬度
中圖法分類號：TG 146
（Institute of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing 100124, China）
Abstract:The variations of microhardness and microstructures for the biomedical Ti-35Nb-5Ta-7Zr and Ti-35Nb-7Zr alloys subjected to different heat treatments were studied by microhardness test, X-ray diffractometry and transmission electron microscopy. The effects of alloying element Ta on these variations and aging precipitation sequences were revealed. The results show that the aging strengthening effect in the Ti-35Nb-5Ta-7Zr alloy is more prominent than that in the Ti-35Nb-7Zr alloy. For the solution-treated Ti-35Nb-5Ta-7Zr and Ti-35Nb-7Zr alloys (in ST state), the precipitation sequences during subsequent aging treatments at 300 and 600 ℃ can be described as β+α″(ST) β+α β+α+isothermal ω for the former, and β+α″+quenched ω(ST) β+α+isothermal ω β+α for the latter. The addition of Ta to the Ti-Nb-Zr alloy system can suppress the formation of quenched ω phase during the solution treatment and increase the precipitation temperature of the isothermal ω phase during subsequent aging treatments.
Key words: biomedical materials; biomedical titanium alloys; Ti-35N6-5Ta-7Zr alloy; Ti-35Nb-7Zr alloy; aging; microstructure; microhardness
