液态金属结构滞后性的测定与模拟  

Experimental Measurement and Simulation for the Hysteresis of Liquid Metal Melt Structure

作　　者：吕士勇[1] 高玉社[1] 周晶[1] 郑超[1] 常芳娥[1] 坚增运[1] 

机构地区：[1]西安工业大学材料与化工学院,西安710032

出　　处：《西安工业大学学报》2009年第2期159-162,共4页Journal of Xi’an Technological University

基　　金：国家自然科学基金(50571076;50671075);国家973项目(2006CB605202)

摘　　要：采用四电极法对温度降低后液态锡的电阻率进行了测定.结果发现温度降低后液态锡的电阻率先随保温时间的延长而升高,保温时间超过10 min后趋于稳定,这预示温度变化后液态金属结构变化存在滞后性.在此基础上,运用分子动力学模拟了温度降低后液态金属结构的变化规律.发现温度变化后原子间距的变化亦存在滞后性,但这一滞后时间仅为0.0001μs,远小于液态金属电阻率随温度变化的滞后时间.这说明金属液电阻率的滞后性与原子间距的变化无关.The resistivity of the liquid tin after a rapid cooling process has been measured by using four electrodes method. It is found that the resistivity of liquid tin first increases with the holding time after changing the melt temperature and reaches a constant value when the holding time is beyond 10 minutes, which indicates that the structure variation of liquid metal lags the temperature. Besides, the structure variation behavior of liquid metal after changing the temperature researched by using molecular dynamics simulation. The result shows that the variation of the atomic spacing in liquid metal lags the temperature. But the lag time is only 0. 000 1 μs, which is much shorter than that of the resistivity. This indicates that the hysteresis of the resistivity is independent of the atomic spacing change.

关 键 词：液态金属 电阻率 分子动力学模拟 原子间距 

分 类 号：TG111[金属学及工艺—物理冶金]