(中南大学 粉末冶金国家重点实验室，长沙 410083)
摘 要: 采用元素混合法制备粉末冶金Ti-Al-Mo-V-Ag合金，通过金相观察、扫描电镜及力学性能测试等方法研究Mo、V和Ag的添加及烧结温度对Ti-5Al合金的烧结行为、显微组织与力学性能影响，并对其作用机制进行探讨。结果表明：1 350 ℃烧结时，V与Mo的添加能改善烧结合金的压缩强度，单独添加Ag时，则降低基体合金的综合性能，但当Ag与Mo、V同时添加到基体合金中时，改变合金的显微组织，提高烧结合金的致密度与抗压缩强度，致密度能达到96%，抗压缩强度达到1 782 MPa。同时，烧结温度不同时，相同成分的粉末冶金Ti-5Al合金的显微组织与性能也表现出不同的特征。
关键字: 钛合金；微合金化；烧结温度；显微组织；力学性能
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
