(1. 沈陽(yáng)理工大學(xué) 裝備工程學(xué)院，沈陽(yáng) 110168；
2. 沈陽(yáng)師范大學(xué) 物理科學(xué)與技術(shù)學(xué)院，沈陽(yáng) 110034)
摘 要: 研究AZ31鎂合金擠出板坯在降溫?zé)彳堖^(guò)程中的組織和織構(gòu)的演變規(guī)律。結(jié)果表明：退火前滑移和孿生是主要的變形機(jī)制和取向硬化機(jī)制；退火后長(zhǎng)條晶的滑移和細(xì)小等軸晶晶界擴(kuò)散遷移的共同作用成為主要的變形機(jī)制；隨著壓下量的增大，析出物開(kāi)始破碎和分散，壓下量在70%~80%之間時(shí)，基面織構(gòu)組分的取向密度存在突變最大值，形成硬取向較強(qiáng)的{0001}基面織構(gòu)，軟化退火能大幅減弱硬取向；通過(guò)一道67%大壓下量和一次軟化退火可順利地將AZ31鎂合金軋制成厚0.5 mm的薄板。
關(guān)鍵字: 鎂合金；軋制；退火；組織；織構(gòu)
（1. School of Equipment Engineering, Shenyang Ligong University, Shenyang 110168, China;
2. College of Physical Science and Technology, Shenyang Normal University, Shenyang 110034, China）
Abstract:The evolution law of microstructure and texture in extruded sheets of magnesium alloy AZ31 during the hot rolling falling temperature process was studied. The results show that slipping and twinning are the major deforming and orientational hardening mechanism before annealing while the sliding of long grain in combination with the diffusing transfer of fine equiaxed grain boundary becomes a major deforming one after annealing. With increasing the reduction, the precipitation falls to pieces and spreads around. And the basal plane texture component has a maximum mutation value of orientation density with reductions of 70%−80%. So a basal plane texture component {0001} is formed, which has stronger orientation density that can be greatly reduced by softening annealing. A sheet of 0.5 mm in thickness can be made from magnesium alloy AZ31 by one 67% reduction pass and one softening annealing pass.
Key words: magnesium alloy; hot-rolling; annealing; microstructure; texture
