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用磁性测量、透射电镜、Kerr磁光效应观测和分析了Sm(CoCuFeZr)_(7.4)合金经固溶处理后,等级时效处理后的磁性、显微组织结构和畴结构。研究了该合金在600℃～1050℃温度范围内恒温时效过程中矫顽力和显微结构的变化,某些样品磁性能达到: Br≥11.5KGs,BHc≥5.4KQe,(B.H)_m≥30.5MGsQe 合金在高矫顽力状态下的显微组织为胞状。等级时效过程中第一级时效(830℃3分)就形成了胞状组织,在随后降低温度的时效过程中,虽然矫顽力由2.8KOe提高到5.3KOe,但显微组织结构基本保持不变,矫顽力的提高与两相成份差增加有关。在800℃长时间恒温时效,胞状组织要破坏,第二相变成片状,在650℃以下时效600分钟,bHc随时效时间线性地变化,并且矫顽力的变化很小,680℃以上恒温时效矫顽力达到峰值后的降低可能与胞状结构的破坏有关。随时效温度的升高,出现矫顽力峰值的时间缩短。时效过程的扩散激活能为34000卡/克原子度。1050℃没有时效效应。
The magnetic, microstructural and domain structures of Sm (CoCuFeZr) _ (7.4) alloy after solution treatment were observed and analyzed by magnetic measurement, transmission electron microscopy and Kerr magneto-optic effect. The changes of coercivity and microstructure during aging at 600 ℃ to 1050 ℃ were investigated. The magnetic properties of some samples were as follows: Br≥11.5KGs, BHc≥5.4KQe, (BH) _m≥30.5 The microstructure of MGsQe alloy under high coercivity state is cellular. In the aging process, the first stage aging (830 ℃ for 3 minutes) formed the cellular structure. During the subsequent aging process, although the coercivity increased from 2.8 kOe to 5.3 kOe, the microstructure remained unchanged , The improvement of coercivity is related to the poor increase of two-phase composition. At 800 ℃ for a long time constant temperature, the cellular structure to be destroyed, the second phase into a sheet, aging below 650 ℃ for 600 minutes, bHc linear with the aging time changes, and changes in coercivity is small, more than 680 ℃ constant temperature Aging after the peak coercivity reduction may be related to the destruction of cellular structure. As the aging temperature increases, the coercivity peak appears shortened. The diffusion activation energy of the aging process is 34,000 cal / g atomic degrees. 1050 ℃ no aging effect.