多级雾化Cu-Cr-Zr-Mg合金的时效硬化行为  

AGING HARDENING OF MULTISTAGE ATOMIZED Cu-Cr-Zr-Mg ALLOY

作　　者：刘平[1,2] 刘平[1,2] 康布熙[2] 曹兴国[2] 黄金亮[2] 顾海澄 

机构地区：[1]西安交通大学材料学院,西安710049 [2]洛阳工学院材料系,洛阳471039

出　　处：《有色金属》1999年第4期71-75,共5页Nonferrous Metals

基　　金：国家自然科学基金

摘　　要：本文对多级雾化－快速凝固Ｃｕ－Ｃｒ－Ｚｒ－Ｍｇ合金粉末，采用热挤压成形方式使其固结成形。研究了热挤压和时效处理对组织和性能的影响规律．结果表明：多级雾化法可以获得球状的微晶粉末，其晶粒尺寸为１－２μｍ．在４５０℃，按１０：１的挤压比成形后．合金的显微硬度可达１６０Ｈｖ，导电率为７８％ＩＡＣＳ．在其挤压后的组织中存在着与母相保持共格关系的铬相和ＣｕＺｒ．经５５０℃时效２ｈ后．显微硬度为１５０Ｈｖ，导电率为８５％ＩＡＣＳ．对在５５０℃时效１０ｍｉｎ的试样进行８０％的形变，可使其显微硬度达Ｈｖ　１９０，导电率为８０％ＩＡＣＳ．Cu-Cr-Zr-Mg alloy powders were produced by multistage atomization RS and wereconsolidated by warm extrusion. The microstructure and properties of the extruded bar before and afteraging treatment were investigated. The results show that the density of the extruded bars can reach toabove 98% of the throretical one under the conditions of vacuum seal and preheating temperatureabout 420 ℃ and extrusion ratio 10: 1. The Cr phase and Cu5Zr precipitates coherent with the matrixwere found in the aged microstructure. Upon aging at 550 ℃ for 2h, the microhardness and electricalconductivity reach about Hv 150 and 85%IACS, respectively. While the microhardness and electricalconductivity reach Hv 190 and 80%IACS, respectively, for the specimens Under 80% deformation afteraping at 550 ℃ for 10min.KEY WORDS extrusion moulding; multistage atondzation; Cu-Cr-Zr-Mg alloys, age hardening

关 键 词：挤压成型 多级雾化 时效硬化 铜合金 

分 类 号：TG146.11[一般工业技术—材料科学与工程]