(1. 上海交通大學(xué) 輕合金精密成型國(guó)家工程研究中心，上海 200030；2. 長(zhǎng)岡技術(shù)科學(xué)大學(xué) 機(jī)械系，新潟 940-2188，日本)
摘 要: 采用基于動(dòng)態(tài)再結(jié)晶的元胞自動(dòng)機(jī)模型模擬分析AZ91鎂合金熱壓縮過程中的流變行為及組織演變。模型中，通過參數(shù)的引入間接地考察第二相粒子對(duì)增加位錯(cuò)增長(zhǎng)速率及降低晶界移動(dòng)速率的影響。對(duì)比分析應(yīng)力—應(yīng)變曲線、組織演變、穩(wěn)態(tài)組織中的平均晶粒尺寸及晶粒邊數(shù)分布，模擬結(jié)果與實(shí)驗(yàn)結(jié)果的良好一致性表明本文作者提出的元胞自動(dòng)機(jī)模型可以用于AZ91合金動(dòng)態(tài)再結(jié)晶過程的模擬研究。
關(guān)鍵字: AZ91合金；熱壓縮；動(dòng)態(tài)再結(jié)晶；析出相；元胞自動(dòng)機(jī)
（1. National Engineering Research Center of Light Alloy Net Forming,Shanghai Jiao Tong University, Shanghai 200030, China;2. Department of Mechanical Engineering, Nagaoka University of Technology, Niigata 940-2188, Japan）
Abstract:The cellular automata (CA) model with dynamic recrystallization (DRX) is proposed and used to investigate the flow behavior and microstructure evolution during hot compression of AZ91 alloy. In the simulation, the effects of the second phase particles on the accumulation of dislocation density and resistance of the migration of grain boundaries have been taken into account by the introduction of the physical parameters. Comparisons of flow curves, microstructure evolution, distribution of average grain size and number of grain side in final microstructure show that the simulated results agree very well with the experimental ones, suggesting that the present CA model is feasible to study the DRX process of AZ91 alloy.
Key words: AZ91 alloy; hot compression; dynamic recrystallizaiton; precipitates; cellular automata
