温度和弹性应变能对Ni75Al21.5Nb3.5合金原子有序行为的影响
Impact of Temperature and Elastic Energy on Atom Ordering Behavior of Ni75Al21.5Nb3.5 Alloy
程立维，王永欣，陈铮, 孙朝远
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作者单位：西北工业大学 凝固技术重点实验室，陕西 西安 710072
中文关键字：关键词: 微观相场方法；Ni75Al21.5Nb3.5合金；原子有序行为；弹性应变能
英文关键字：Key words: microscopic phase-field model; Ni75Al21.5Nb3.5 alloy; atom ordering behavior; elastic energy
中文摘要：摘 要: 微观相场法研究了应力和温度共同耦合作用下Ni75Al21.5Nb3.5合金的原子有序行为。结果表明：弹性应变能参数ξ越大L10相的孕育期越短，所析出的L10相的最大体积分数更大、存在时间也更长、单一取向性也更明显。在同一温度下，Ni原子在αⅡ位的最小占位几率随ξ的增加而降低，而Al、Nb原子则呈相反的变化趋势；L10最大体积分数随ξ的增大先增加而后趋于稳定。在同一畸变能下，Ni原子在αⅡ位的最小占位几率随温度的升高而增加，而Al、Nb原子则恰好相反；L10最大体积分数随温度的升高先增大后减小。
英文摘要：Abstract: The transient ordering behavior of Ni75Al21.5Nb3.5 alloy on the coupling effect of temperature and elastic energy is studied by microscopic phase-field model. The results show that as ξ increases the incubation period of L10 gets shorter, the maximum volume fraction of L10 phase becomes larger with longer existence time and more obvious single orientation. At the same temperature, the minimum occupation probability of Ni atom at αII declines with the increase of ξ, while with the opposite tendency with Al and Nb. The maximum volume fraction of L10 increases as ξ increases initially and is tending towards stability afterwards; At the same value of ξ, the minimum occupation probability of Ni atom at αII declines with the increase of temperature, while as the opposite tendency with Al and Nb. The maximum volume fraction of L10 increases as temperature increase initially and decreases afterwards.