(中南大学 粉末冶金国家重点实验室，长沙 410083)
摘 要: 采用冷等静压、高温烧结和直接高温旋锻的方法制备Mo-Ti-Zr合金棒材，研究不同退火温度对合金力学性能与显微组织的影响以及对断面收缩率为30%的旋锻Mo-Ti-Zr合金棒材的退火行为。结果表明：当退火温度低于1 000 ℃时，随着退火温度的升高，Mo-Ti-Zr合金硬度未急剧下降，抗拉强度和伸长率逐渐提高；经900 ℃退火后，合金抗拉强度达到669 MPa，伸长率达到3.1%，获得良好的综合力学性能；当退火温度在800~1 000 ℃范围内时，Mo-Ti-Zr合金晶粒发生再结晶细化；旋锻态Mo-Ti-Zr合金的断口主要为穿晶解理断裂，随着退火温度的提高，出现较多细晶粒的穿晶断裂和沿晶断裂。
关键字: Mo-Ti-Zr合金；冷等静压；高温烧结；旋锻；退火；再结晶
（State Key laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract:The Mo-Ti-Zr alloy bars were prepared by cold isostatic pressing, high temperature sintering and direct rotary forging. The effects of the annealing temperature on the mechanical properties and microstructure of the alloy and the annealing behavior of this rotary forging Mo-Ti-Zr alloy bars deformed by 30% were investigated. The results show that, with increasing annealing temperature before 1 000 ℃, the hardness of the Mo-Ti-Zr alloy bars decreases slowly whereas the tensile strength and elongation increase. The tensile strength and elongation reach 669 MPa and 3.1%, respectively, at 900 ℃. The recrystallization of the Mo-Ti-Zr alloy bars occurs and the grains are refined at the annealing temperature of 800−1 000 ℃. For the rotary forging Mo-Ti-Zr alloy bars, its fracture is mainly a transcrystalline fracture type. The mixed type of transcrystalline fracture and intergranular fracture in the refined grains increases with increasing annealing temperature.
Key words: Mo-Ti-Zr alloy; cold isostatic pressing; high temperature sintering; rotary forging; annealing; recrystallization
