(1. 湖南大學(xué)汽車車身先進(jìn)設(shè)計(jì)制造國家重點(diǎn)實(shí)驗(yàn)室，長沙 410082；
2. 湖南科技大學(xué)高溫耐磨材料及制備技術(shù)湖南省國防科技重點(diǎn)實(shí)驗(yàn)室，湘潭411201)
摘 要: 采用100 kN servo-hydraulic MTS型試驗(yàn)機(jī)對(duì)擠壓態(tài)AZ31鎂合金進(jìn)行溫度為350 ℃、應(yīng)變速率為0.3 s-1和不同應(yīng)變量下的熱壓縮；利用X射線衍射(XRD)測(cè)量不同應(yīng)變量下的織構(gòu)，并利用取向分布函數(shù)計(jì)算其織構(gòu)類型，分析織構(gòu)轉(zhuǎn)變；通過電子背散射衍射技術(shù)(EBSD)分析孿生的形成情況。同時(shí)，計(jì)算不同滑移系和孿生的斯密特因子，分析不同滑移系和孿生開啟的先后次序。結(jié)果表明：變形初期，由于拉伸孿生的出現(xiàn)導(dǎo)致 (0001) 和(0001) 織構(gòu)的形成，并隨應(yīng)變量的增加，發(fā)生動(dòng)態(tài)再結(jié)晶， [0001]和 [0001]纖維織構(gòu)完全由(0001) 和(0001) 織構(gòu)代替；在變形初期，大部分晶粒先產(chǎn)生拉伸孿生，接著發(fā)生二階錐面滑移。
關(guān)鍵字: AZ31鎂合金；織構(gòu)；拉伸孿生；斯密特因子
（1. State Key Laboratory of Advance Design and Manufacturing for Vehicle body, Hunan University,
Changsha 410082, China;
2. Key Laboratory of High Temperature Wear Resistant Materials Preparation Technology of Hunan Province,
Hunan University of Science and Technology, Xiangtan 411201, China）
Abstract:The hot compression test was performed on 100 kN servo-hydraulic MTS test machine at temperature of 350 ℃ and strain rate of 0.3 s-1 under different strains. X-ray diffraction (XRD) was used to measure texture. Then, the texture type under different conditions was also calculated using orientation diffraction function under different conditions, aiming to study the texture transformation. The electron back-scattering diffraction (EBSD) was used to analyze twinning. Schmid factor for different slip systems and twinning were calculated to determine the order of initiation of deformation modes. The results indicate that the extension twinning is observed at the early deformation stage, mainly contributing to the formation of (0001) and (0001) texture. [0001] and [0001] fiber texture are finally replaced by (0001) and (0001) texture as the initiation of dynamic recrystallization. At the beginning of deformation, substantial grains firstly occur extension twinning，followed by 2nd-order pyramidal slip.
Key words: AZ31 magnesium alloy; texture; extension twinning; schmid factor
