(合肥工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院，合肥 230009)
摘 要: 采用X 線衍射儀和EBSD分析研究近α型TA15鈦合金在不同工藝參數(shù)下的熱壓縮變形組織和織構(gòu)演變規(guī)律。結(jié)果表明：TA15合金熱變形后淬火組織中存在針狀馬氏體α′相；晶粒在(101)和(002)滑移面上的滑移率先達(dá)到臨界分切應(yīng)力，發(fā)生塑性變形，使組織細(xì)化，并最終導(dǎo)致變形組織的擇優(yōu)取向；在小應(yīng)變速率(0.01 s-1)和低變形溫度(950 ℃)條件下，動(dòng)態(tài)再結(jié)晶分?jǐn)?shù)較高，產(chǎn)生較強(qiáng)的再結(jié)晶織構(gòu)；隨著變形溫度和應(yīng)變速率的升高，材料晶粒取向性減弱。
關(guān)鍵字: TA15鈦合金；熱變形；微觀組織；織構(gòu)
（School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China）
Abstract:The microstructures and textures of TA15 titanium alloy after hot deformation under different process parameters were investigated by X-ray diffractometry (XRD) and electron back scattering diffractometry (EBSD). The results indicate that microstructures of TA15 alloy appear obvious acicular martensite α′ phase after hot deformation and quenching. The plastic deformation is going to occur in the slip systems of (101) and (002) slip planes by first reaching the critical resolved shear stress. The strong recrystallization textures are achieved at low deformation temperature and low strain rate, which will be weakened with increasing the strain rate and temperature.
Key words: TA15 titanium alloy; hot deformation; microstructure; texture
