(中南工业大学材料科学与工程系， 长沙 410083)
摘 要: 采用硬度、 金相和透射电镜等分析测试手段研究了一种Al-Mg-Sc合金的再结晶温度和再结晶形核机制。 结果表明： 合金的再结晶起始温度为375 ℃， 终了温度为520 ℃； 合金再结晶温度高的原因是细小弥散的Al3Sc质点对位错和亚晶界的钉扎作用； 合金的再结晶形核机制为亚晶合并和亚晶长大的双重作用。
关键字: 关键词: Al-Mg-Sc合金 再结晶 钪 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
