半固态材料微观结构统计特征的多尺度研究  

Multiscale Research on Statistical Characteristics of Semi-Solid Materials Microstructure

作　　者：余小鲁[1] 李付国[1] 李淼泉[1] 

机构地区：[1]西北工业大学,陕西西安710072

出　　处：《稀有金属材料与工程》2007年第A03期404-408,共5页Rare Metal Materials and Engineering

基　　金：航空基础科学基金(03H53048);"十五"航空预研项目资助

摘　　要：利用组织定量分析的原理,从微观机理与宏观特性相结合的角度对半固态材料2次重熔过程中微观结构特征(固相颗粒大小分布和体积百分比分布等)的统计性质进行多尺度分析与研究,得到固相颗粒大小和体积分数的统计规律。同时对结果进行了讨论,根据研究结果可知统计分布概率密度函数与加热温度有着紧密的联系。Based on combining micromechanism and macro-characteristic, statistical characteristics of semi-solid materials microstructure when partial remelting, such as size distributions and volume percent distributions of solid particles, are mainly investigated. Theoretical size distributions of solid particles are lognormal distributions, which is in agreement with experimental data. Volume percent distributions of solid particles are gauss distributions. The relation between probability density function of equivalent diameters of solid particles and heating temperature is discussed. It is shown that mean and max value of density function of size distributions increases with that of heating temperature, whereas variance decreases. Mean and max value of density function of volume percent distributions increases and variance decreases with the decrease of heating temperature decreasing when the volume of specimen is constant. However, the max value increases but variance decreases along with the increase of volume of specimen when heating temperature is constant.

关 键 词：半固态 微观结构 统计特征 微观机理 多尺度 

分 类 号：TB303[一般工业技术—材料科学与工程]