(合肥工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院，合肥 230009)
摘 要: 采用電子背散射衍射(EBSD)技術(shù)對新型亞穩(wěn)態(tài)β型TB8鈦合金的熱壓縮變形組織和織構(gòu)進(jìn)行研究。結(jié)果表明：TB8合金熱壓縮變形組織呈明顯的形變不均勻特征；動態(tài)再結(jié)晶的形核及長大與亞結(jié)構(gòu)的演變關(guān)系極為密切；變形過程中無論動態(tài)再結(jié)晶是否發(fā)生或進(jìn)行完全，形變組織都存在較強(qiáng)織構(gòu)，造成TB8鈦合金力學(xué)性能及成形性的各向異性。
關(guān)鍵字: TB8鈦合金；熱變形；顯微組織；織構(gòu)；動態(tài)再結(jié)晶；亞結(jié)構(gòu)
（School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China）
Abstract:The microstructures and textures of a new metstable β-TB8 titanium alloy after hot deformation were investigated by electron backscattered electron diffracometry (EBSD). The results show that the microstructures of the TB8 titanium alloy after hot compression are obviously characterized as inhomogenity. The nucleation and growth of the dynamic recrystallization grains are in close relations with the evolution of substructure during the deformation process. No matter whether the dynamic recrystallization happens or the recrystallization is completely finished strong textures are achieved, which will result in the anisotropy of mechanical properties and formability for the TB8 titanium alloy.
Key words: TB8 titanium alloy; hot deformation; microstructure; texture; dynamic recrystallization; submicrostructure
