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用热磁分析方法较仔细地观测了Fe-Ni-Al三元系合金沿β+β′两相区内某一结线上的几个不同成分的合金样品。淬火所得的成分接近Fe_2NiAl的过饱和固溶体在较高温度(～850℃)分解甚快,在一分钟内脱溶基本上完成。在850℃分出的β′相还含铁约35at.％,其居里点在400℃附近。在850℃经短时间回火继以水淬的合金,在600—700℃再经适当的回火,则首次回火所生成的β′相继续迅速分解,在不超过十分钟内损失大量的铁而变成非铁磁性的;其在室温的H_c可增到500奥斯特。这和Б.Г.Лившнц“所提出的继续脱溶”的假设相符。磁性观测的结果证明:β′相的继续脱溶是“可逆的”,就是说,把曾在600—700℃回火的合金重热至850℃时β′相能在几分钟内恢复850℃的平衡成分。Fe_2NiAl过饱和固溶体在较低温度(70O℃以下)分解极慢,并且其过程是明显地“不均匀”的。因此,这种合金不能通过高温淬火继以较低温度(600—700℃)回火的处理来获得高H_c的事实可以用单畴粒子的理论加以解释。
Thermogravimetric analysis was used to examine the alloy samples of Fe-Ni-Al ternary alloys along several different phases in a β + β ’two-phase region. The supersaturated solid solution of the quenched composition close to that of Fe 2 NiAl decomposes rapidly at higher temperatures (~ 850 ° C) and is virtually complete within one minute. The β ’phase separated at 850 ° C also contains about 35 at.% Iron, with a Curie point around 400 ° C. After quenching at 850 ℃ for a short time followed by water quenching the alloy at 600-700 ℃ and then by the appropriate tempering, the first tempering generated β ’continue to rapidly decompose in less than ten minutes loss of large Iron becomes non-ferromagnetic; its Hc at room temperature increases to 500 Oe. This is in line with the assumption made by Б.Г.Лившнц “to continue to dissolve.” The result of the magnetic observation proves that the continued desolvation of the β ’phase is “reversible”, that is, the β’ phase can be restored to 850 ° C in a few minutes by reheating the alloy tempered at 600-700 ° C to 850 ° C The balance of ingredients. The supersaturated Fe 2 NiAl solid solution decomposes very slowly at lower temperatures (below 70 ° C) and its process is clearly “non-uniform”. Therefore, the fact that this alloy can not get high Hc by high temperature quenching followed by tempering at a lower temperature (600-700 ° C) can be explained by the theory of monodomain particles.