摘要
应用微观相场法,计算Al-9.0at%Li合金沉淀相中的反位缺陷Al_(Li)和Li_(Al)随时效温度及时间变化的规律。结果表明,在相同的时效温度下,L12结构的Al_3Li相中反位缺陷Al_(Li)和Li_(Al)随时效时间的增加逐渐减小,且在富Al环境下Al_(Li)反位缺陷的浓度高于Li_(Al),在Al_3Li相中以Al_(Li)为主,同时存在少量的Li_(Al)。当时效温度发生变化时,时效温度越高,在Al_3Li相稳定形核后Li_(Al)、Al_(Li)反位缺陷的浓度越高。在达到平衡浓度前也具有这个特点,但是规律性并不显著。
The antisite defects Al（Li） and Li（Al） in Al-9.0at%Li alloys with change of aging time and temperature were investigated by a microscopic phase-field method. Results show that at the same aging temperature, the antisite defects Al（Li） and Li（Al） in Al3Li phase, which are L12 structure, reduce gradually with longer aging time. Under the Al-rich condition, the concentration of Al（Li） antisite defect is higher than that of Li（Al） antisite defect. In Al3Li phase, the antisite defect is mainly Al（Li） with a few Li（Al）. When the aging temperature is changed, the higher the temperature is, the higher the concentration of Al（Li） and Li（Al） antisite defects after stable nucleation of Al3Li phase. Though there are the characteristics before the stable nucleation, the regularity is not remarkable.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2016年第5期1220-1224,共5页
Rare Metal Materials and Engineering
基金
国家自然科学基金(51301067)
中央高校基本科研业务费专项资金(2015MS46)
