(北京科技大學(xué) 材料科學(xué)與工程學(xué)院，北京 100083)
摘 要: 選取TA2合金進(jìn)行壓縮來(lái)研究純鈦在熱壓縮過(guò)程中形變、再結(jié)晶與相變的交互作用規(guī)律，在不同的變形參數(shù)下進(jìn)行熱模擬壓縮實(shí)驗(yàn)。實(shí)驗(yàn)發(fā)現(xiàn)，在熱壓縮之后的冷卻過(guò)程中有明顯的變體選擇現(xiàn)象發(fā)生，在壓應(yīng)力作用下[0001]垂直于壓縮方向的柱面織構(gòu)組分會(huì)優(yōu)先形成，因此會(huì)造成通過(guò)相變而產(chǎn)生的強(qiáng)柱面織構(gòu)與變形α相所產(chǎn)生的強(qiáng)基面織構(gòu)有明顯的不同。研究表明，形成最小的彈性應(yīng)變能是促使變體選擇產(chǎn)生的主要原因。同時(shí)，對(duì)TA2純鈦在熱變形過(guò)程中的再結(jié)晶規(guī)律和組織轉(zhuǎn)變特征進(jìn)行了研究。
關(guān)鍵字: 純鈦；熱壓縮；相變；織構(gòu)；變體選擇
（School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China）
Abstract:TA2 pure titanium was chosen to research the interaction among deformation, recrystallization and phase transformation during hot compression. The samples were hot compressed by thermal simulation method with different processing parameters. Variant selection induced by stress during cooling after compression was found. The prismatical texture component which featured that the [0001] direction perpendicular to the compressing direction produced preferentially under the compressing stress. As a result, the transformed α phase possesses strong prismatical texture which is different with the basal texture of compressed α phase. The minimum elastic strain energy is demonstrated to be the main reason that causes the variant selection. Dynamic recrystallization behavior and microstructure evolution during hot compression were also studied.
Key words: pure titanium; hot compression; phase transformation; texture; variant selection
