(1. 西安交通大學 材料科學與工程學院，西安 710049；
2 . 洛陽工學院 材料工程系，洛陽 471039)
摘 要: 采用多級霧化快速凝固方法制取Cu-Cr合金粉末, 經(jīng)熱擠壓使其固結成形；對合金粉末和擠壓后的組織進行了觀察和分析，研究了時效處理對擠壓后合金組織和性能的影響。結果表明: 多級霧化法制備的Cu-Cr合金粉末顆粒呈球狀或類球狀, 顆粒平均尺寸為10～15 μm，晶粒尺寸可達1～2 μm。粉末在包套中經(jīng)真空封裝后, 在390℃溫度下, 按10∶1的擠壓比擠壓成形, 擠壓合金經(jīng)時效處理后可使其導電率達到82%(IACS)以上, 顯微硬度達HV170，抗拉強度為540 MPa。
關鍵字: 多級霧化；Cu-Cr合金；熱擠壓；時效硬化
（1. School of Materials Science and Engineering, Xi'an Jiaoton g University, Xi'an 710049, P.R.China
2. Department of Materials Engineering, Luoyang Institute of Technology, Luoyang 471039, P.R.China）
Abstract:Cu-Cr alloy powder was produced by multistage atomization RS and was consolidated by hot extrusion. The microstructures of the powder and the extruded alloy were investigated. The microstructure and properties of the extruded bars after aging treatment were studied. The results show that the powder particle of the multistage atomized Cu-Cr alloy has the granular shape with a mean size about 10～15μm and a grain size about 1～2 μm, and the density of the extruded bars can be over 98% of the theoretical one under the condition of vacuum seal and preheating temperature about 390℃ and extrusion ratio 10 :1. After aging treatment, the electrical conductivity and the microhardness can reach 82% (IACS) and HV170, tensile strength 540MPa, respectively.
Key words: multi-stage atomization; Cu-Cr alloy; hot extrusion; age hardening
