(西北工业大学 材料学院 凝固技术国家重点实验室，西安 710072)
摘 要: 采用光学显微镜和透射电子显微镜研究Ti60高温钛合金在不同热处理制度后内部组织的变化，以及不同时效时间对合金力学性能的影响。结果表明：Ti60合金经(1 015 ℃, 2 h)固溶处理后，大量的位错塞积在晶界附近，组织内部没有析出相存在；而经过2 h时效以后，在晶界和相界上有硅化物析出；时效24 h后，硅化物的析出不再局限在α/β界面析出，在初生α相内和α板条内均有析出，析出数量增加，尺寸增大，且呈“线型”分布；延长时效时间至24 h，板条组织内部均匀析出细小的有序α2相；随着时效时间的延长，合金强度变化不大，但塑性明显降低。
关键字: 高温钛合金；热稳定性能；断口形貌；富氧层
（State Key Laboratory of Solidification Processing, School of Materials, Northwestern Polytechnical University, Xi’an 710072）
Abstract:The effects of heat treatment on microstructure and tensile properties of Ti60 alloy were investigated by optical microscope and transmission electron microscopy (TEM) as well as tensile testing. The results show that a large amount of dislocations are piled up at the grain boundaries, and no precipitations are observed after the alloy is treated at 1015 °C for 2 h. Aging of the specimens at 700°C for 2 h results in the precipitation of silicides at grain and α/β phase boundaries. Extending the aging time to 24 h, excepting the silicides in the primary α and lamellar α phase, the α2 phase presents in the alloy. Extend the aging, the strength of the Ti60 alloy increases but the ductility of the alloy decreases strongly.
Key words: Ti60 alloy; heat treatment; microstructure; tensile properties
