多尺度组织控制的高强高导CuAgFe合金凝固与析出机理研究

项目名称： 多尺度组织控制的高强高导CuAgFe合金凝固与析出机理研究

项目编号： No.51474066

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 矿业工程

项目作者： 左小伟

作者单位： 东北大学

项目金额： 82万元

中文摘要： 基础学科的发展迫切需要超高强磁场的极端环境以探索基本规律，这对应用在超高强磁体绕组线圈中的高强高导材料提出更高要求。然而目前应用的CuAg合金强度和导电性已接近极限，多元合金化是提升其性能的一个重要方向。围绕细化CuAg合金中纳米Ag析出相和降低固溶Ag含量这两个影响其性能的关键科学难点，提出“细枝晶、促析出、降固溶”的技术路线，通过添加微量铁磁性Fe改变凝固和析出动力学条件，结合冷速、生长速率、形变热处理等工艺，特别是辅以国际上最强的30T高强电阻磁场，控制微观尺度枝晶和纳米尺度析出相的形核生长，研究不同工艺条件对凝固组织、溶质分布、沉淀析出和塑性应变时组织及性能的影响，获得超强的细晶强化与析出强化效果，最大限度地降低杂质散射效应；揭示高强磁场对不同尺度和不同磁性组织及性能的作用机理，为理解多元多尺度微观结构与性能和控制工艺的关系奠定理论基础，为高性能高强高导铜基合金的应用提供技术支撑。

中文关键词： 铜基合金；凝固过程；纳米析出相；强磁场；高强高导

英文摘要： The development of basic sciences requires urgently to explore basic theories under extreme condition with super-high magnetic fields. Thus, higher performance Cu-Ag based conductors with high strength high conductivity are demanded in the super high magnet winding coils. However, the strength of CuAg composite is almost close to its limitation. Multiphase alloys are an important research direction to increase their properties. Both the Ag solubility and the spacing of nano Ag precipitates for CuAg alloys are critical scientific questions influencing their properties. In this proposal, the research route of Refining dendrites, Promoting precipitation and Decreasing solubility is proposed and the dynamics conditions are changed during the solidification and precipitation behaviors by adding the minor third element of Fe and adjusting cooling rate, growth rate, thermo-mechanical process etc, especially by subjecting 30T highest DC magnetic field (HMF). The nucleation and growth of micro dendrites and nano precipitations could be controlled. The microstructure, solute distribution, precipitation, the deformed microstructural evolution and properties are systematically investigated. The ultimate objective is to strengthen the precipitation strengthening, and to decrease the impurity scattering. It will be helpful to build up the relative mechanisms of the effects of HMF on different scaled microstructure with different magnetic states, and properties. In addition, it will make us understand the basic theories among the multisized microstructure, properties and process. The results will provide technical supports on the application of high performance Copper based alloys.

英文关键词： Copper based alloy;solidification;nano precipitation;high magnetic field;high strength and high conductivity