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为了消除Cu-Zn-Al-Ni合金铸锭中枝晶偏析及非平衡组织所带来的不利影响,分别对该合金进行900℃保温2～8h均匀化退火研究。结果表明,随保温时间的延长,合金的枝晶偏析及非平衡组织得以明显减少和改善,其硬度则随之逐渐升高并趋于稳定。同时在此基础上,对均匀化过程中的扩散行为进行研究,建立起相应的均匀化动力学方程,并确定了Al元素在该合金中的扩散激活能。经验证,实验与理论计算结果基本吻合,得出该合金较佳的均匀化退火工艺为900℃×6h。
In order to eliminate the detrimental effect of dendritic segregation and unbalanced structure in Cu-Zn-Al-Ni alloy ingot, the alloy was annealed at 900 ℃ for 2 ~ 8h. The results show that the dendritic segregation and unbalanced microstructure of the alloy can be obviously reduced and improved with the increase of holding time, and its hardness gradually increases and tends to be stable. At the same time, on this basis, the diffusion behavior in the homogenization process was studied, and the corresponding uniform kinetic equation was established. The diffusion activation energy of Al element in the alloy was also determined. It is verified that the experimental and theoretical calculations are basically in agreement, and the better homogenization annealing process of this alloy is 900 ℃ × 6h.