New atom movement mechanism for tracking path on disordering AuCuI(A_8^(Au)A_4^(Cu)) compound  

AuCuI(A_8^(Au)A_4^(Cu))化合物无序化路径跟踪的原子移动新机制(英文)

作　　者：谢佑卿[1,2,3] 彭红建[4] 刘心笔[1,2,3] 李小波[5] 聂耀庄[6] 

机构地区：[1]中南大学 材料科学与工程学院,长沙410083 [2]中南大学 粉末冶金研究院,长沙410083 [3]中南大学 粉末冶金国家重点实验室,长沙410083 [4]中南大学 化学化工学院,长沙410083 [5]湘潭大学 材料科学与工程学院,湘潭411105 [6]中南大学 物理与电子学院,长沙410083

出　　处：《Transactions of Nonferrous Metals Society of China》2014年第10期3221-3256,共36页中国有色金属学报（英文版）

基　　金：Project(51071181)supported by the National Natural Science Foundation of China;Project(2013FJ4043)supported by the Natural Science Foundation of Hunan Province,China

摘　　要：Taking experimental path on disordering AuCuI（AAuCu8A4）composed of A Au8 and ACu4 stem alloy genes as an example, three discoveries and a method were presented. The ability of Au Cu I（AAu Cu8 A4）to keep structure stabilization against changing temperature is attributed to the fact that the AAu8 and ACu4 potential well depths greatly surpass their vibration energies, which leads to the subequilibrium of experimental path. A new atom movement mechanism of AuCuI（AAuACu84）to change structure for suiting variation in temperature is the resonance activating-synchro alternating of alloy genes, which leads to heterogeneous and successive subequilibrium transitions. There exists jumping order degree, which leads to the existence of jumping Tj-temperature and an unexpected so-called ＂retro-effect＂ about jumping temperature retrograde shift to lower temperatures upon the increasing heating rate. A set of subequilibrium holographic network path charts were obtained by the experimental mixed enthalpy path method.以由AAu8和ACu4干基因组成的AuCuI(AAu Cu8 A4)化合物的无序化实验路径为例,介绍了3个发现和1个方法。发现AuCuI(AAuCu8A4)化合物抗拒温度变化保持结构稳定性的能力归因于AAu8和ACu4基因的势阱深度远超过其振动能,这导致其无序化实验路径是亚平衡的;发现AuCuI(AAu Cu8 A4)适应温度变化改变结构的原子移动新机制是合金基因的"共振激活-同步交换"机制,这导致无序化是非均匀性和递次性的亚平衡转变;发现无序化过程中存在跳变有序度,导致存在跳变温度和升温速度增加跳变温度降低的"逆反效应",即所谓的"Retro效应"。采用实验混合焓路径法,建立了一整套亚平衡全息网络路径图。

关 键 词：INTERMETALLICS alloy gene order/disorder transformation resonance activating-synchro alternating mechanism thermodynamic properties equilibrium and subequilibrium holographic network path charts 

分 类 号：O641[理学—物理化学]