Ag微合金化形变Cu-Cr原位复合材料的界面特性及韧化机理

项目名称： Ag微合金化形变Cu-Cr原位复合材料的界面特性及韧化机理

项目编号： No.51461018

项目类型： 地区科学基金项目

立项/批准年度： 2015

项目学科： 一般工业技术

项目作者： 刘克明

作者单位： 南昌工程学院

项目金额： 48万元

中文摘要： 形变Cu-Cr系原位复合材料的塑韧性是其在航空航天、军事及现代通讯等许多高科技领域应用的重要基础。申请人前期研究发现，微量Ag元素加入可显著改善其塑性变形能力，与已有研究报道的较高含量Ag元素甚至少量其它第三组元的加入均将使形变Cu基原位复合材料塑韧性下降的结果截然不同。因此，本项目拟采用TEM菊池花样衍射技术辅以EBSD取向差应变分析技术研究不同应变条件下Ag微合金化对形变Cu-Cr原位复合材料界面微观应变场分布规律的影响，分析材料在塑性变形条件下的变形机制，结合纳米压痕技术建立Ag微合金化所引起的界面微观应变场与材料塑韧性变化之间的关系模型，探索Ag微合金化的韧化机理；综合运用Ag微合金化、形变及各种热处理调控材料的塑韧性、强度和电导率，建立高塑性、高强度和高导电形变Cu-Cr系原位复合材料的制备技术原型，从而丰富多元合金化的韧化机理和形变Cu基原位复合材料性能调控的科学内涵。

中文关键词： 大塑性变形；Cu-Cr-Ag；原位复合材料；界面特性；韧化机理

英文摘要： The plasticity of deformation-processed Cu-Cr in situ composite is the important basis for the application in such fields as aerospace, military, modern communications and other high-tech. Our previous research found that Ag micro-alloying improved the plasticity, while some studies reported that relatively high content of Ag even small amounts of other third component decreased the plasticity of deformation-processed Cu-based in situ composites, which are two opposite conclusions. Therefore, we are going to investigate the influence of Ag micro-alloying on the distribution of interfacial micro-strain field in deformation-processed Cu-Cr in situ composites under different strain conditions by using the techniques of Kikuchi pattern analysis in TEM (Transmission Electron Microscope) and EBSD (Electron Back-Scatter Diffraction) crystal orientation difference analysis, analyse the deformation mechanism of Cu-Cr-(Ag) in plastic deformation, establish the relation model between the interfacial micro-strain field and the plasticity of Cu-Cr-(Ag) caused by the changes of Ag content by combining nanoindenter, study the toughening mechanism of Ag micro-alloying; coordinate the plasticity, strength and conductivity by making use of Ag micro-alloying, deformation and various heat treatment, develop a prototype for the preparation of a high-plasticity and high-strength and high-conductivity deformation-processed Cu-Cr-Ag in situ composite. The project will widen the toughening mechanism of complex alloying and the scientific connotation of properties coordination of deformation-processed Cu-based in situ composites.

英文关键词： severe plastic deformation;Cu-Cr-Ag;in situ composite;interface characteristics;toughening mechanism