时效温度对Al-9.0at%Li合金反位原子缺陷的影响
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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 Al_3Li 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 Al_3Li 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 Al_3Li phase. Though there are the characteristics before the stable nucleation, the regularity is not remarkable.
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 Al_3Li 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 Al_3Li 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 Al_3Li phase. Though there are the characteristics before the stable nucleation, the regularity is not remarkable.
引文
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