(中南工業(yè)大學(xué)材料科學(xué)與工程系， 長沙 410083)
摘 要: 采用硬度、 金相和透射電鏡等分析測(cè)試手段研究了一種Al-Mg-Sc合金的再結(jié)晶溫度和再結(jié)晶形核機(jī)制。 結(jié)果表明： 合金的再結(jié)晶起始溫度為375 ℃， 終了溫度為520 ℃； 合金再結(jié)晶溫度高的原因是細(xì)小彌散的Al3Sc質(zhì)點(diǎn)對(duì)位錯(cuò)和亞晶界的釘扎作用； 合金的再結(jié)晶形核機(jī)制為亞晶合并和亞晶長大的雙重作用。
關(guān)鍵字: 關(guān)鍵詞: Al-Mg-Sc合金 再結(jié)晶 鈧 形核
（Department of Materials Science and Engineering,Central South University of Technology, Changsha 410083, P. R. China）
Abstract:
The recrystallizing temperature and nucleation mechanism of an Al-Mg-Sc alloy have been studied by hardness measurement, optical microscope and transmission electron microscope. The results show that the starting temperature point is 375 ℃ while the ending temperature point is 520 ℃ in the recrystallization of the alloy. The increase in recrystalliz ing temperature is caused by the pinning effect of highly dispersed Al3Sc precipitates on dislocation and subgrain boundary. The recrystallizing process presents itself the nucleation mechanism of the alloy involving not only the subgrain coalescence but also the subgrain growth.
Key words: Al-Mg-Sc alloy recrystallization scandium nucleation
