【摘要】 采用压力辅助的燃烧合成与快速凝固复合技术成功地制备了Cu₉₀Cr₁₀合金。采用X射线衍射仪（XRD）、扫描电子显微镜（SEM）分析铜铬合金的显微组织,同时测定了样品的室温压缩屈服强度和显微硬度。结果表明:β-Cr枝晶均匀地分布在铜基体上,二次枝晶臂间距在3～10μm之间,未发现宏观偏析。快速冷却导致小的二次枝晶臂间距的形成。Cu₉₀Cr₁₀合金具有较高的屈服强度（368MPa）和显微硬度（1.306±0.114GPa）。高的强度和硬度主要归因于晶粒细化、固溶强化和析出强化。枝晶增韧是铜铬合金具有较高塑性和加工硬化能力的主要原因。更多还原

【Abstract】 Cu90Cr10alloy has been fabricated by a combination of pressure-assisted combustion synthesis and rapid solidification technique. Phase identification was carried out by X-ray diffraction( XRD),and the microstructural features of the as-fabricated Cu-Cr samples were examined by scanning electron microscopy( SEM). The compressive yield strength and micro hardness were also measured. The results show that β-Cr dendrites are uniformly distributed on α-Cu matrix,and the secondary dendrite arm spacing( SDAS) ranges from 3 to 10 micron,and segregation is not found. Rapid cooling rate results in the formation of the ultrafine-grained and smaller SDAS. The Cu-Cr samples have higher compressive yield strength( 368MPa) and micro hardness( 1. 306 ±0. 114GPa). The higher yield strength and hardness are attributed to grain refinement,solid solution strengthening and precipitation strength. Higher work hardening capacity and excellent ductility are key to dendrite toughening.更多还原