(東北大學(xué) 材料與冶金學(xué)院 材料各向異性與織構(gòu)教育部重點(diǎn)實(shí)驗(yàn)室，沈陽 110004)
摘 要: 建立一個(gè)相場(chǎng)模型，并對(duì)AZ31鎂合金進(jìn)行再結(jié)晶晶粒長(zhǎng)大模擬，提出一系列法則以確定模型中參數(shù)的真實(shí)值，從而實(shí)現(xiàn)組織演化在工業(yè)應(yīng)用范圍內(nèi)的真實(shí)時(shí)空模擬。在300~400 ℃ 100 min內(nèi)時(shí)，模擬結(jié)果與實(shí)驗(yàn)結(jié)果吻合得很好，在250 ℃時(shí)，模擬結(jié)果與實(shí)驗(yàn)結(jié)果有較大偏離，說明該合金體系的界面遷移激活能在低溫時(shí)有所改變，定量模擬研究該合金組織的混晶程度。結(jié)果表明：合金在300~400 ℃時(shí)，隨時(shí)效時(shí)間的延長(zhǎng)，混晶特別嚴(yán)重。模型模擬相場(chǎng)法界面控制過程組織演變的真實(shí)時(shí)空，所確定的參數(shù)值也可以用于其他相似合金系統(tǒng)的模擬。
關(guān)鍵字: AZ31鎂合金；相場(chǎng)法；再結(jié)晶；晶粒長(zhǎng)大；計(jì)算機(jī)模擬
recrystallization by phase field model
（Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education,
School of Materials Science and Metallurgy, Northeastern University, Shenyang 110004, China）
Abstract:A model was established to simulate the realistic spatio-temporal microstructure evolution in recrystallization of Mg alloy using the phase field approach. The rules were proposed to decide the real physical values of all parameters in the model. The simulated results agree well with the reported experimental measurements at 300−400 ℃ in 100 min. However, there is an obvious deviation between the simulation and experimental results at 250 ℃, which indicates a variation in interface mobility activation energy of the alloy system at the temperature. The grain size fluctuation in the microstructure was studied quantitatively. The results show that the grain size becomes more severe with increasing aging time at the temperatures of 300−400 ℃. The model simulates the grain growth in real spatio-temporal scale for the first time and the parameter values can be regarded as a database for other similar alloy systems.
Key words: AZ31 Mg alloy; phase-field model; recrystallization; grain growth; computer simulation
