Stobrawa J P, Rdzawski Z M, Głuchowski W J
Non-Ferrous Metals Institute, ul. Sowińskiego 5, 44-100 Gliwice, Poland.
J Nanosci Nanotechnol. 2012 Dec;12(12):9102-11. doi: 10.1166/jnn.2012.6762.
Dispersion and precipitation strengthened copper alloys is a group of functional and structural materials used where combination of high electrical conductivity with high strength is required. A growing trend to use new copper-based functional materials is observed recently world-wide. Within this group of materials particular attention is drawn to those with ultra fine grain size of a copper matrix. This study was aimed to investigate mechanical properties, electrical conductivity and microstructure in Cu-yttria microcomposite produced by powder metallurgy methods and in CuCr0.6 alloy strips processed by continuous repetitive corrugation and straightening (CRCS). The changes of mechanical properties (HV, ultimate tensile strength, 0.2 yield strength) electrical conductivity as well as microstructure evolution versus true strain were investigated. The microstructure was investigated using optical and electron microscopy (HRTEM and SEM). Possibility of quenching elimination during processing has been also analysed. The Cu-yttria microcomposite produced by powder metallurgy methods and CRCS process of a CuCr0.6 alloys strips effectively reduced the grain size, demonstrating the powder metallurgy and CRCS as a promising new methods for producing nano and ultra fine grained copper matrix.
弥散和沉淀强化铜合金是一类功能和结构材料，用于需要高电导率与高强度相结合的场合。最近在全球范围内观察到使用新型铜基功能材料的趋势日益增长。在这类材料中，特别关注那些具有超细铜基体晶粒尺寸的材料。本研究旨在研究通过粉末冶金方法制备的Cu-氧化钇微复合材料以及通过连续重复波纹化和矫直（CRCS）加工的CuCr0.6合金带材的力学性能、电导率和微观结构。研究了力学性能（HV、极限抗拉强度、0.2屈服强度）、电导率以及微观结构演变与真实应变的关系。使用光学和电子显微镜（HRTEM和SEM）研究微观结构。还分析了加工过程中消除淬火的可能性。通过粉末冶金方法制备的Cu-氧化钇微复合材料以及CuCr0.6合金带材的CRCS工艺有效地减小了晶粒尺寸，证明了粉末冶金和CRCS是生产纳米和超细晶粒铜基体的有前景的新方法。
