( 1. 西安交通大学 材料科学与工程学院， 西安 710049；
2. 河南科技大学 材料科学与工程学院，洛阳 471039；
3. 洛阳铜加工厂， 洛阳 471039)
摘 要: Cu-Ag-Cr合金是一种高强度高电导新型材料。采用真空熔炼的方法制备了Cu-Ag-Cr合金，经合适的工艺处理后， 在电导率基本上不降低的前提下， 能显著提高合金的强度和硬度， 抗拉强度达到529MPa， 电导率为92.11%（IACS）， 基本满足对铜合金高强高导的性能要求。 在同样条件下， 与Cu-Ag合金相比， 其强度和硬度的提高主要是由共格析出强化造成，由于析出相尺寸较大， 以Orowan机制强化，强化效应与采用Orowan强化机制计算的结果非常接近。
关键字: Cu-Ag-Cr合金；强化机制； 高强度； 高电导
high-conductivity Cu-0.1Ag-0.11Cr alloy
（ 1. School of Materials Science and Engineering,
Xi′an Jiaotong University, Xi′an 710049, China;
2. School of Materials Science and Engineering,
Henan University of Science and Technology,
Luoyang 471039, China;
3. Luoyang Copper (Group) Co Ltd,
Luoyang 471039, China）
Abstract: Cu-Ag-Cr alloy with high-strength and high conductivity is a new wire material. By means of a vacuum induction melting, Cu-Ag-Cr alloy was produced. After proper heat-treatment processes, the strength and hardness of the alloy were remarkably improved while the conductivity only had a little decrease. Tensile strength is enhanced to about 529MPa and the conductivity remains 92.11%(IACS) which shows that the alloy can meet the demand of high-strength and high conductivity. Compared with Cu-Ag alloy under the same test conditions, the coherent precipitation hardening is proved to be the major factors that improve the strength and hardness of the alloy. Because of the larger sizes of the precipitated phase, an Orowan strengthening mechanism is operated. The degree of coherent strengthening is almost identical with the calculated one by Orowan strengthening theory.
Key words: Cu-Ag-Cr alloy; strengthening mechanism; high-strength; high conductivity
