(中南大學(xué) 材料科學(xué)與工程學(xué)院，長沙 410083)
摘 要: 對AZ31鎂合金鑄軋板進(jìn)行單道次熱軋實(shí)驗(yàn)，利用光學(xué)顯微鏡、X射線和透射電鏡對熱軋過程中微觀組織和織構(gòu)的演變規(guī)律進(jìn)行研究。結(jié)果表明：AZ31鎂合金鑄軋板具有較強(qiáng)的基面織構(gòu)，當(dāng)熱軋變形量較小時，孿生是主要的變形機(jī)制；當(dāng)熱軋變形量較大時，位錯滑移成為主要的變形機(jī)制；10%熱軋態(tài)中出現(xiàn)的透鏡狀的 寬孿晶使基面織構(gòu)明顯減弱；20%熱軋過程中則出現(xiàn) 、 兩種不同形貌的孿晶；當(dāng)變形量大于20%時，位錯滑移大量開動，基面織構(gòu)也顯著增強(qiáng)，并在隨后的退火過程形成細(xì)小均勻的再結(jié)晶組織。
關(guān)鍵字: AZ31鎂合金；熱軋；變形機(jī)制；織構(gòu)
AZ31 magnesium alloy during hot-rolling process
（School of Materials Science and Engineering, Central South University, Changsha 410084, China）
Abstract:The single-pass hot-rolling was processed on the cast-rolled sheet of AZ31 magnesium alloy. The evolution of microstructure and texture was studied with OM, TEM and XRD. The results show that the cast-rolled sheet has a strong basal texture, and the main deformation mechanism is twinning in hot-rolling with small reduction while the dislocation slip becomes the main deformation mechanism in hot-rolling with large reduction. The thick lenticular twins generated in 10% hot-rolling process seriously weakens the basal texture, while two types of twins and with different morphologies are produced in 20% rolling process. As the rolling reduction exceeds 20%, the dislocation slip is activated in a wider range, thus intensifying the basal texture. And the fragmentation morphology produced in the rolling process transforms to equal-axis recrystallization grains in following annealing.
Key words: AZ31 magnesium alloy; hot-rolling; deformation mechanism; texture
