(1. 昆明理工大學 材料科學與工程學院，昆明 650093；
2. 云南省鈦材應用產品工程技術研究中心，楚雄 651209)
摘 要: 利用放電等離子燒結技術制備生物醫(yī)用Ti-24Nb-4Zr-8Sn合金，研究固溶時效處理對合金顯微組織和力學性能(強度、塑韌性及彈性模量)的影響。結果表明：合金經850 ℃固溶處理后主要由β相、少量初生α相及淬火馬氏體α″相組成；在450 ℃時效處理后，合金基體β相內析出大量細小無規(guī)則的針狀次生α相，隨著時效時間從4 h延長到48 h，次生α相趨于定向析出，含量和尺寸逐漸增大；與燒結態(tài)相比，固溶時效處理后合金抗壓強度和彈性模量增大，而塑韌性呈先提高后降低趨勢；經優(yōu)化后固溶時效處理制度為(850 ℃，1.5 h，WQ)+(450 ℃，4 h，F(xiàn)C)，此時合金抗壓強度、屈強比和彈性模量分別為1701 MPa、0.69 GPa和42.8 GPa。
關鍵字: Ti-24Nb-4Zr-8Sn合金；放電等離子燒結；熱處理；顯微組織；力學性能
（1. School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China;
2. Engineering Technology Research Center of Titanium Products and Application of Yunnan Province, Chuxiong 651209, China）
Abstract:Biomedical Ti-24Nb-4Zr-8Sn alloys were prepared by spark plasma sintering. The effects of solution-aging heat treatments on the microstructure and mechanical properties (strength, ductility and elastic modulus) of the alloys were investigated. The results show that the alloys are composed of metastable β phase, little primary α phase and α″ martensite after solution treatment at 850 ℃. After aging at 450 ℃，much short , fine and disordered needle α phases precipitated within primary β grains. With the aging time increases from 4 h to 48 h, the content and grain size of secondary α phase grows up which precipitates directionally from β matrix. Compared with the as-sintered, the compressive strength and elasticity modulus of the alloys increase after solution and aging heat treatment, while the ductility of the alloys increases at first and then decreases. After the suitable heat treatment of (850 ℃, 1.5 h, WQ)+(450 ℃, 4 h, FC), the compressive strength, yield ratio, elasticity modulus are 1701 MPa, 0.69 GPa and 42.8 GPa, respectively.
Key words: Ti-24Nb-4Zr-8Sn alloy; spark plasma sintering; heat treatment; microstructure; mechanical property
