纳米钛合金成分聚集的改进Miedema模型  

Modified Miedema Model for Component Segregation of Nano Ti Binary Alloys

作　　者：谢斌[1] 廖树帜[1] 陈佳[1] 吕云宾[1] 彭好军[1] 王小丽[1] 张淳[1] 谢浩文[1] 欧阳义芳[2] 张邦维[3,4] 

机构地区：[1]湖南师范大学,湖南长沙410081 [2]广西大学,广西南宁530004 [3]湖南大学,湖南长沙410082 [4]中国科学院国际材料物理中心,辽宁沈阳110015

出　　处：《稀有金属材料与工程》2010年第7期1175-1179,共5页Rare Metal Materials and Engineering

基　　金：湖南省教育厅资助科研项目(06C508);湖南省科技计划(2009FJ3153);国家教育部大学生创新计划;湖南省研究生科研创新计划(CX2009B102)

摘　　要：考虑表面效应,利用改进Miedema模型推导得到纳米二元合金形成焓的计算公式,并将它用于二元Ti-M(M=Si,Fe,Zn,Tc,Cd,Re,Os,Pb,Bi)纳米合金形成焓的研究。结果表明,对于同一成分的纳米合金来说,随着晶粒粒径的减小,形成焓增加,合金稳定性降低。晶粒尺寸在10nm以下时,成分聚集现象十分明显,合金的聚集方向和聚集程度由聚集驱动能控制。Taking account of the surface effect,the formula for the calculation of the formation enthalpy of nano Ti binary alloys was deduced by modified Miedema model. And the formula was used to study the formation enthalpy of Ti-M （M=Si,Fe,Zn,Tc,Cd,Re,Os,Pb,Bi） nano binary alloys. The results show that the formation enthalpy and structure stability are affected by the grain size for Ti binary alloys with the same composition. That is to say,the smaller the particle size,the greater the formation enthalpy and the worse the structure stability. Also,the component segregation for the nano Ti binary alloys is very clear when the grain size is less than 10 nm. The direction and the degree of aggregation are controlled by the aggregation driving energy.

关 键 词：纳米二元钛合金 改进Miedema模型 形成焓 成分聚集 

分 类 号：TG146.23[一般工业技术—材料科学与工程] TG111.3[金属学及工艺—金属材料]