(西北工業(yè)大學(xué) 材料學(xué)院 凝固技術(shù)國家重點實驗室，西安 710072)
摘 要: 采用光學(xué)顯微鏡和透射電子顯微鏡研究Ti60高溫鈦合金在不同熱處理制度后內(nèi)部組織的變化，以及不同時效時間對合金力學(xué)性能的影響。結(jié)果表明：Ti60合金經(jīng)(1 015 ℃, 2 h)固溶處理后，大量的位錯塞積在晶界附近，組織內(nèi)部沒有析出相存在；而經(jīng)過2 h時效以后，在晶界和相界上有硅化物析出；時效24 h后，硅化物的析出不再局限在α/β界面析出，在初生α相內(nèi)和α板條內(nèi)均有析出，析出數(shù)量增加，尺寸增大，且呈“線型”分布；延長時效時間至24 h，板條組織內(nèi)部均勻析出細小的有序α2相；隨著時效時間的延長，合金強度變化不大，但塑性明顯降低。
關(guān)鍵字: 高溫鈦合金；熱穩(wěn)定性能；斷口形貌；富氧層
（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
