(1. 南昌航空大學(xué) 航空制造工程學(xué)院，南昌 330063；
2. 北京航空材料研究院 先進(jìn)鈦合金航空科技重點(diǎn)研究院，北京 100095)
摘 要: 針對(duì)TB17鈦合金，研究不同工藝參數(shù)下的室溫變形及變形后的時(shí)效析出行為。通過組織觀察及XRD分析，在應(yīng)變量為0.22以下的室溫變形狀態(tài)以及經(jīng)室溫變形后在(350 ℃，0.5 h)的低溫時(shí)效過程中均發(fā)生馬氏體相變；變形過程中產(chǎn)生的形變誘導(dǎo)馬氏體及低溫時(shí)效過程中產(chǎn)生的等溫馬氏體都屬于板條型馬氏體，且均在晶界附近析出；不同點(diǎn)在于等溫馬氏體呈平行規(guī)則分布，而形變誘導(dǎo)馬氏體呈現(xiàn)不規(guī)則分布；在500 ℃長(zhǎng)時(shí)間時(shí)效的條件下馬氏體相全部分解，細(xì)小的α相沿著變形帶結(jié)構(gòu)析出，形成大量交錯(cuò)分布的條狀α相。在分步變形實(shí)驗(yàn)中，等溫馬氏體在二次變形中起到了降低變形抗力與減小彈性模量的作用。
關(guān)鍵字: 形變誘導(dǎo)馬氏體；等溫馬氏體；低溫時(shí)效；彈性模量
（1. School of Aeronautical Manufacturing Engineering, Nanchang Hangkong University, Nanchang 330063, China;
2. Aviation Key Laboratory of Science and Technology on Advanced Titanium Alloys, Beijing Institute of Aeronautical Materials, Beijing 100095, China）
Abstract:The room temperature deformation behavior of TB17 titanium alloy and the subsequent aging precipitation behavior were studied in this work. After structure observation and XRD analysis, martensite phase was detected both in room temperature deformation with a strain less than 0.22 and a low temperature aging process at 350 ℃ warmed for 0.5 h. Deformations induced martensite and isothermal martensite which are formed in room temperature deformation and low temperature aging process, respectively, both belong to lath martensite and precipitated near grain boundaries, the different is the latter one exhibits a parallel regular distribution, but the former one shows a little mess. As aging temperature raises to 500 ℃, martensite decomposes, fine α phase precipitates along the deformation band, a mass of needle-like α phase staggers distribution in microstructure. During the step deformation test, isothermal martensite makes an effect on resistance force reduction and a decrease in elasticity modulusin second-step deformation.
Key words: deformation induced martensite; isothermal martensite; low temperature aging; elasticity modulus
