(中南大學(xué) 粉末冶金國家重點實驗室，長沙 410083)
摘 要: 采用元素混合法制備粉末冶金Ti-Al-Mo-V-Ag合金，通過金相觀察、掃描電鏡及力學(xué)性能測試等方法研究Mo、V和Ag的添加及燒結(jié)溫度對Ti-5Al合金的燒結(jié)行為、顯微組織與力學(xué)性能影響，并對其作用機制進行探討。結(jié)果表明：1 350 ℃燒結(jié)時，V與Mo的添加能改善燒結(jié)合金的壓縮強度，單獨添加Ag時，則降低基體合金的綜合性能，但當Ag與Mo、V同時添加到基體合金中時，改變合金的顯微組織，提高燒結(jié)合金的致密度與抗壓縮強度，致密度能達到96%，抗壓縮強度達到1 782 MPa。同時，燒結(jié)溫度不同時，相同成分的粉末冶金Ti-5Al合金的顯微組織與性能也表現(xiàn)出不同的特征。
關(guān)鍵字: 鈦合金；微合金化；燒結(jié)溫度；顯微組織；力學(xué)性能
mechanical properties of powder metallurgy Ti-5Al alloy
（State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract:The powder metallurgy (P/M) Ti-Al-Mo-V-Ag alloys were processed by powder metallurgy using the blended elemental (BE) technique. The effects of Mo, V and Ag additions and sintering temperature on the microstructures and mechanical properties of the Ti-5Al alloys were investigated using optical microscope, scanning electron microscope and mechanical properties tests. The results show that adding Mo or V elements improves the compression strength of the based alloys after sintering at 1 350 ℃, and Ag element addition decreases the properties of Ti-5Al alloy. However, adding Ag element with Mo and V elements increases the density and compressive strength of P/M Ti-5Al alloy. The relative density and compressive strength of the Ti-5Al-4Mo-4V-5Ag alloy are 96% and 1 782 MPa, respectively. Moreover, the sintering temperature also affects the microstructures and properties of the PM Ti-5Al based alloys.
Key words: titanium alloys; microalloying; sintering temperature; microstructure; mechanical properties
