温度诱导合金液态物理性质异常变化与结构转变的关系

项目名称： 温度诱导合金液态物理性质异常变化与结构转变的关系

项目编号： No.50871047

项目类型： 面上项目

立项/批准年度： 2009

项目学科： 生物科学

项目作者： 耿浩然

作者单位： 济南大学

项目金额： 34万元

中文摘要： 在物质液态研究领域，有关合金液态性质及本质的研究是一个重要而难解的课题，目前对合金液态物理性质与微观结构关系的认识尚处于起步阶段。本项目采用实验测试、计算机模拟计算和理论分析等方法，深入研究了温度诱导合金熔体的黏度、电阻率、密度等性质及其微观结构转变的规律性，重点对物理性质-温度关系中出现的非连续异常变化现象进行了深入地研究；深入探索了非连续变化与液-液结构转变之间的联系；根据合金熔体中亚稳相的性质及变化，推导了描述熔体等温均匀化过程的半经验关系式；探索了通过由液态物理性质信息表征结构变化特征的途径和方法，熔体内原子团簇在不同温度下的时空特性，InSn熔体径向分布函数的赫斯特指数特性；初步建立了实验合金电阻率-原子团簇结构的关系及物理模型，研究了熔体结构演变和热速处理对多种合金凝固组织和性能的影响，研究结果显示，通过合理地利用结构变化和采用热速处理技术，明显改善了合金固态的力学等性能，并从物理性质的角度诠释了结构变化的特征。该项目的完成扩展了对金属熔体结构性质及其变化等科学问题的认知，为深入进行合金熔体结构和熔炼技术的研究提供了有价值的理论和技术基础。

中文关键词： 合金熔体结构；密度；黏度；液-液结构转变.

英文摘要： The properties and innate characteristics of liquid alloys are an important and intractable issue in liquid research field, at present, understanding of the relationship between microstructure and physical properties of liquid alloys is still in the initial stage. Experimental testing, computer simulation and theoretical analysis methods wrer used in the project. Temperature-induced viscosity, resistivity, density and other properties and regularity of microstructure changes have been lucubrated. This project focuses on the non-continuous abnormal changes on physical properties-temperature relation and the relationship between non-continuous changes and liquid-liquid structural changes. Based on the changes of metastable microheterogeneity of melt, a semi-empirical formulation was established for the description of isothermal homogenization process of melt. New approaches due to liquid physical properties have been explored to characterize the liquid structural change. Time-spatial properties of atom clusters and hurst’ exponent of radial distribution function of InSn melt have been studied. Relationship between the experimental resistivity and cluster structure were preliminarily established. Effects of the evolution of the melt structure and thermal rate treatment for a variety of alloy’ solidification structure and properties were studied, the results show, the rational use of structural changes and thermal rate treatment technology can significantly improve the alloy’ mechanical performance. This project will help to further improve and add liquid alloy solidification theory and provide a more scientific basis for study of the development of new alloys and alloy melting process.

英文关键词： structure of alloy melt; density; viscosity;liquid-liquid structure transaction