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本文研究了1％Nb取代等量Ti的AlNiCo8合金热处理制度与组织结构的关系,用不稳态分解(Spinodal decomposition)的理论进行了讨论。样品的成份为:7％Al,14％Ni,34％Co,3.1％Cu,4.5Ti,1％Nb或5％Ti两种,热处理工艺为:1270℃,20分,风冷淬火,750,780,810,83O℃分别为10分钟磁场等温后空冷;810℃分别为10,30,60,90分钟磁场等混后空冷。取二个样品经810℃10分钟等温磁场处理后进行三级回火。用冲击法测其磁性。用J、de、Vos和岩间法进行氧化复型,在DXA 4—10电子显微镜下观察。根据电子显微镜照片测量了强磁性相的断面直径,得出不稳态分解的临界温度为:843℃(5％Ti),839℃(1％Nb,4.5％Ti),长大规律l=Kt~(1/m),其中K=385,m=256。证明Nb使不稳态分解移向低温,降低强磁性相长大速度,从而具有良好的工艺性能。
In this paper, the relationship between the heat treatment system and microstructure of AlNiCo8 alloy with 1% Nb instead of Ti is studied. The theory of unsteady decomposition (Spinodal decomposition) is discussed. The samples were composed of 7% Al, 14% Ni, 34% Co, 3.1% Cu, 4.5Ti, 1% Nb or 5% Ti. The heat treatment process was 1270 ° C for 20 minutes, air quench, 750,780,810, 83O ℃ were 10 minutes after the magnetic field isothermal air cooling; 810 ℃ respectively 10,30,60,90 minutes after the magnetic field equal air cooling. Take two samples by 810 ℃ 10 minutes isothermal magnetic field after three tempering. Measured by the impact of magnetic law. Oxidative dilatation was performed using J, de, Vos and interlaboratory methods and observed under a DXA 4-10 electron microscope. The cross-sectional diameter of the ferromagnetic phase was measured by electron micrograph. The critical temperature of the unstable decomposition was 843 ℃ (5% Ti), 839 ℃ (1% Nb, 4.5% Ti) ~ (1 / m), where K = 385 and m = 256. It is proved that Nb moves the unsteady decomposition to low temperature and lowers the growth rate of ferromagnetic phase, thereby having good process performance.