用于α-Al_2O_3分子动力学模拟的长程Finnis-Sinclair势函数  

Long-range Finnis-Sinclair potential for molecular dynamics simulation of α-Al_2O_3

作　　者：胡志刚[1] 刘益虎[1] 吴永全[1] 沈通[1] 王召柯[1] 

机构地区：[1]上海大学上海市现代冶金及材料制备重点实验室,上海200072

出　　处：《物理学报》2009年第11期7838-7844,共7页Acta Physica Sinica

基　　金：国家自然科学基金重点项目(批准号:50334050);国家自然科学基金(批准号:50504010);国家自然科学基金委员会和上海宝钢集团公司联合基金(批准号:50774112);上海市青年科技启明星计划(批准号:07QA14021);长江学者和创新团队发展计划(批准号:IRT0739)资助的课题~~

摘　　要：用金属势函数描述氧化物是实现金属-氧化物界面分子动力学模拟的关键.基于此,通过拟合α-Al2O3的晶格能、晶格常数、弹性常数,获得了一套用于描述α-Al2O3的长程Finnis-Sinclair(F-S)势.通过与已报道的描述α-Al2O3的EAM势、Glue势和modifiedMatsui(m-Matsui)势的比较,结果达到或优于前人的结果.进而,在300K的温度下对α-Al2O3体系进行了MD模拟,模拟结果与实验值也符合较好,证明了本套势参数对α-Al2O3及Fe-Al2O3界面描述的适用.The molecular dynamics （MD） simulation of metal-metal oxide interface requires a uniform potential to simultaneously describe metal and metal oxide. Accordingly, we obtained a set of long-range Finnis-Sinclair （F-S） potential parameters of α-Al_2O_3. All of the parameters were fitted to the targets, i.e. the experimental lattice energy, lattice constants, and elastic constants of α-Al_2O_3. Meanwhile, we compared our results with those reported by EAM, Glue and modified Matsui （m-Matsui） potentials and found that our rcsults are equivalent or better. After that, MD simulation of α-Al_2O_3 at 300 K with our long-range F-S potential was performed and the pair correlation functions, coordination numbers were calculated. The good agreement between calculation results and experiments validated the feasibility of this set of F-S potential parameters to the description of α-Al2O3 system.

关 键 词：长程F-S势 Α-AL2O3 Fe-Al2O3界面 Al-Al2O3界面 

分 类 号：TG111[金属学及工艺—物理冶金]