Characteristic atom occupation patterns of Au_3Cu,AuCu_3,AuCuI and AuCuII based on experimental data of disordered alloys  

以无序合金的实验数据为基础的Au_3Cu,AuCu_3,AuCuI和AuCuII的特征原子占据图(英文)

作　　者：谢佑卿[1,2,3] 李艳芬[1,2,3] 刘心笔[1,2,3] 李晓波[4] 彭红建[1,2,3] 聂耀庄[1,2,3] 

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]湘潭大学机械工程学院,湘潭411105

出　　处：《Transactions of Nonferrous Metals Society of China》2011年第5期1092-1104,共13页中国有色金属学报（英文版）

基　　金：Project (50711181) supported by the National Natural Science Foundation of China; Project (2009FJ4016) supported by Natural Science Foundation of Hunan Province,China

摘　　要：The potential energies, volumes and electronic structures of characteristic atoms coordinated by neighboring configurations were obtained from the experimental heats of formation and lattice parameters of disordered Au1-xCux alloys. From characteristic atom occupation （CAO） patterns of L12-Au3Cu, L12-AuCu3 and Llo-AuCu compounds, their electronic structures, volumetric and energetic properties were calculated. The CAO pattern of Johasson-Linde（J-L） model shows that the transition AuCuI→AuCulI is an exothermic and volume contraction reaction, which is opposite from experimental phenomena. According to CAO pattern of Guymont-Feutelais-Legendre（G-F-L） model, the AuCulI cell consists of two periodic antidirection （PAD） AuCuI regions and two PAD boundary regions. The equations derived from CAO pattern of G-F-L model can be used to calculate energetic properties, volumetric properties and ordering degrees of the PAD AuCuI region and PAD boundary region, as well as corresponding average properties of the AuCulI phase. The results are consistent with experimental phenomena.根据无序Au1_xCux合金的实验生成热和晶格常数得到只考虑近邻原子组态的特征原子的势能、体积和电子结构,计算L12-Au3Cu,L12-AuCu3和L10-AuCu化合物的特征原子占据(CAO)图、电子结构、能量和体积性质。Johasson-Linde(J-L)模型的CAO图表明,AuCuI→AuCuII转变是一个放热且体积缩小的反应,但正好与实验现象相反。根据Guymont-Feutelais-Legendre(G-F-L)模型的CAO图,AuCuII晶胞由两个周期反相(PAD)的AuCuI区域和两个PAD边界区域组成;从G-F-L模型的CAO图得出的公式可用来计算PAD AuCuI区域和PAD边界区域的能量性质、体积性质和有序度及AuCuII相的平均性质,计算结果与实验现象相吻合。

关 键 词：Au-Cu system INTERMETALLICS electronic structure crystalline structure characteristic atom occupation pattern 

分 类 号：TG111.1[金属学及工艺—物理冶金]