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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 microscopic phase field method was used to calculate the regularity of the aging temperature and time of Al Li (Li) and Li (Al) in the Al-9.0 at% Li alloy precipitation phase. The results show that Al_ (Li) and Li_ (Al) in the Al_3Li phase of L12 structure decrease gradually with the aging time at the same aging temperature, and Al_ (Li) Is higher than that of Li_ (Al). Al_ (Li) is the main phase in Al_3Li phase, and a small amount of Li_ (Al) exists at the same time. When the aging temperature changes, the higher the aging temperature, the higher the concentration of LiAl and Al Li anti-phase defects after the Al 3 Li phase is stabilized and nucleated. This characteristic is also reached before the equilibrium concentration is reached, but the regularity is not significant.