柱状晶组织铜铬锆合金的变形行为及形变-时效强化机制

项目名称： 柱状晶组织铜铬锆合金的变形行为及形变-时效强化机制

项目编号： No.51504023

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 矿业工程

项目作者： 付华栋

作者单位： 北京科技大学

项目金额： 20万元

中文摘要： 高强高导Cu-Cr-Zr合金接触线是高速铁路列车速度和安全性能提升的关键材料，市场需求巨大。目前我国高性能Cu-Cr-Zr合金接触线制备技术落后、主要依赖进口，严重制约了高铁产业的快速发展。本项目将二段式热冷组合铸型水平连铸技术应用于Cu-Cr-Zr合金凝固组织的精确控制，提出采用“二段式热冷组合铸型水平连铸+冷轧变形+形变-时效处理”的工艺方案制备高性能Cu-Cr-Zr合金接触线的新思路。通过重点研究和阐明“柱状晶组织合金的变形特征与机制”、“合金形变-时效交互作用规律与累积强化机制”两个科学问题，开发一种高性能Cu-Cr-Zr合金短流程高效制备加工工艺，解决现有Cu-Cr-Zr合金制备工艺需热加工开坯和表面清洗、工艺流程长、生产成本高等问题。

中文关键词： 组织性能控制；塑性变形；组织演变；变形机制；金属流动规律

英文摘要： High-strength and high-conductivity Cu-Cr-Zr alloy contact wire is the key material for improving speed and safety property of high speed railways, which is in great market demand. At present, high-property Cu-Cr-Zr alloy contact wires is in a state of backward technology and basically dependent on import, which restrain the quick development of high railway severely. This project applies Two-Stage Heating-Cooling Combined Mold casting technology (HCCM casting for short) on the accurate control of Cu-Cr-Zr alloy solidification microstructure and puts forward “HCCM casting + cold rolling + deformation-aging treatment” process to prepare Cu-Cr-Zr alloy contact wires. By means of confirming “deformation feature and mechanism of columnar-grained alloys”, “deformation-aging interacting effect and accumulation strengthening mechanism” these two scientific problems, the aim of this project is to develop a kind of compact-process high-efficiency preparation technology of high-property Cu-Cr-Zr alloys to solve the hot working cogging and surface cleaning requirements, long process and high cost problems of the existing preparation technology.

英文关键词： Microstructure and mechanical properties control;Plastic deformation;Microstructure evolution;Deformation mechanism;Metal flowing law