C对Cu-Fe和Cu-Cr合金组织与性能的影响规律

申请人前期研究发现，C元素的加入将引起Cu-Fe/Cr系合金的宏观偏析，而有研究报道微量C元素加入可细化Cu-Fe合金的铸态组织，改善力学与导电性能，这说明随着合金成分及C加入量等因素的变化，C的作用是复杂的，因此，非常有必要深入研究和掌握C对Cu-Fe/Cr系合金组织与性能的影响规律和机理，以指导生产实践和新材料开发。本项目采用热力学计算与实验相结合的方法，深入分析研究C对Cu-Fe/Cr系合金凝固组织的影响和机理，解开“C在什么条件下引起Fe、Cr第二相宏观偏析，而又在什么条件下可以细化组织，改善性能”谜团；通过第一性原理计算和热力学、动力学分析与实验相结合，研究C的存在方式及对Fe、Cr元素在铜基体中的固溶度和Cu-Fe/Cr系合金力学、导电性能的影响及机理；研究利用加C引起液相分离现象制备新型Cu-Fe/Cr系双金属复合材料技术，研究分析此类复合材料的组织、性能特征和开发应用前景。

Our previous research found that the addition of C will cause the macrosegregation of Cu-Fe/Cr alloys, while some studies reported that C micro-alloying refined the microstructure and improved the strength and conductivity of Cu-Fe alloy, which are two opposite conclusions. Therefore, it is very necessary to study and know well the influence law and mechanism of C on the microstructure and properties of Cu-Fe/Cr alloys, which is beneficial to the production and development of new materials. We are going to investigate the influence law and mechanism of C on the as cast structure of Cu-Fe/Cr alloys by combining the thermodynamic caculation and experiments; study the influence law and mechanism of C on the solid solubility of Fe/Cr in Cu matrix, and the mechanical and electrical properties of Cu-Fe/Cr alloys by using first principles caculation, thermodynamic and kinetic analysis and experiments; research the preparation technique, microstructure and properties characteristics of C-alloying Cu-Fe/Cr composites, and explore and forecast the developmental ways and application prospect of these composites by using our calculated and observed liquid phase separation caused by the addition of C.