Cu-Cr-Ti原位复合材料定向凝固制备及组织稳定性的研究

项目名称： Cu-Cr-Ti原位复合材料定向凝固制备及组织稳定性的研究

项目编号： No.51261007

项目类型： 地区科学基金项目

立项/批准年度： 2013

项目学科： 一般工业技术

项目作者： 李勇

作者单位： 江西理工大学

项目金额： 50万元

中文摘要： 形变Cu-Cr原位复合材料由于具有低成本、高强度和高导电率结合的优良性能，在高速电气化铁路和城市轨道交通等领域具有很好的应用前景。目前，采用传统方法制备的原位复合材料，其纤维组织不连续、定向性及纤维强化效果不好，导电性较差；而采用粉末冶金法则生产成本较高，铸锭较小，严重限制了其工业化应用。同时，国内外的研究中，大变形铜基原位复合材料的纤维组织形成的规律、纤维热稳定性及其与铜基体的位向关系，强化机理、导电机理等方面尚不明晰，目前还存在较大的争议。本项目采用定向凝固技术制备Cu-Cr-Ti原位复合材料铸锭，研究定向凝固过程中的微观组织形貌，建立稳定液固界面位置的控制模型；研究铜基体及增强纤维在变形及热处理过程中的断裂机制，建立纤维稳定模型；研究Cu/Cr界面微观结构，确定界面的结合情况及基体与纤维的位向关系，建立界面结合因子与原位复合材料异相界面性能的关系。

中文关键词： Cu-Cr-Ti；定向凝固；组织稳定性；界面强化；

英文摘要： Deformation processed Cu-Cr in-situ composites have very good application prospects at high speed electrified railway and urban rail transit for low cost, high strength and high conductivity of the combination of the excellent properties. At present, the copper-base in-situ composites prepared by the traditional methods have disadvantage of continuous fiber, direction and fiber reinforced, conductivity. And the higher cost and smaller ingots of the powder metallurgy method severely restrict its industrial application. At the same time, the formation principle, thermal stability, relationship, strengthen mechanism, conductive mechanism of the fibers are not clear in the domestic and foreign research. The Cu-Cr-Ti in-situ composite ingots are prepared by the directional solidification technology in the study. The microstructure morphology are investigated in the directional solidification process; The models of controlling a stable liquid-solid interface position are established; The fracture mechanism of the copper matrix and fibers in the deformation and heat treatment process are studied to establish a fiber stable model; The interface microstructure, the combination of interface and relationship of Cu/Cr interface are investigated to establish the relationship between interface bonding factor and the interface

英文关键词： Cu-Cr-Ti；directional solidification；microstructure stability；Interface strengthen；