(北京航空材料研究院 航空材料检测与评价北京市重点实验室，北京 100095)
摘 要: 在Gleeble-3800热模拟机上对电渣熔铸态镍铜合金NCu30-4-2-1进行高温热压缩实验，研究该合金在900~1 100 ℃和应变速率为0.01~10 s-1条件下的流变应力行为。结果表明：在变形初期，随着应变的增加，流变应力增大，出现峰值后逐渐趋于平稳；随着温度的升高，峰值应力减小，而随着应变速率的增大，峰值应力增大，求得镍铜合金NCu30-4-2-1的热变形激活能Q为416.5 kJ/mol，Zener-Hollomon参数的对数和峰值应力的对数较好地满足线性关系，建立了镍铜合金NCu30-4-2-1的流变应力方程；合金的显微组织受变形温度和显微组织的影响，变形温度越高，应变速率越低，越有利于动态再结晶的发生。
关键字: 镍铜合金NCu30-4-2-1；热压缩变形；流变应力；变形激活能；动态再结晶
（Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation,
Beijing Institute of Aeronautical Materials, Beijing 100095, China）
Abstract:The flow stress behavior of nickel-copper alloy NCu30-4-2-1 electroslag castings during hot compression was studied by thermal simulation test at the deformation condition of 900-1 100 ℃ and 0.01-10 s-1 on the Gleeble-3800 thermal-mechanical simulator. The results show that the flow stress increases with increasing strain and tends to be constant after a peak value. The peak stress increases with increasing strain rate, and decreases with increasing deformation temperature. The calculated hot deformation activation energy is 416.5 kJ/mol. The logarithm of Zener-Hollomon parameter has a good linear relationship with the logarithm of peak stress, and the flow stress equation of nickel-copper alloy NCu30-4-2-1 was established. The microstructure strongly depends on the deformation temperature and strain rate, and lower strain rate promotes the dynamic recrystallization.
Key words: nickel-copper alloy NCu30-4-2-1; hot compression deformation; flow stress; hot deformation activation energy; dynamic recrystallization
