采用SEM和XRD等手段分析了Fe82Cu1B12Si4 Nb1与Fe73.5 Cu1 B7 Si15.5 Nb3纳米晶合金带材在空气中灼烧后的晶化产物和氧化产物;通过降低Nb和Si元素含量,提高Fe和B元素的含量,虽然使Fe82Cu1 B12 Si4 Nb1纳米晶合金具有高饱和磁感应强度和低的矫顽力,但却降低了它的非晶形成和抗氧化能力。根据K.Hono等采用原子探针法观察到的在晶化过程中各元素分布情况,提出了一个晶化过程模型,通过模型分析了纳米晶合金的抗氧化能力的原因;随着晶化过程推进,残余非晶相中Nb元素含量增加,使得残余非晶相区的晶化温度提高,同时发挥限制晶体长大的作用。
The crystallization and oxidation are analysed by SEM and XRD methods after Fe82Cu1B12Si4Nb1 and Fe73.5Cu1B7Si15.5Nb3 glass alloys burning in air for 3s at 600℃.Fe82Cu1B12Si4Nb1 alloy has high saturation influx density and low coercivity,but the amorphous forming ability and antioxidant ability are weakened with decreasing Nb and Si concentration and increasing Fe and B concentration.The crystallization model is put forward on the basis of elements distribution of K.Hono＇ observation.The crystallization temperature of residual amorphous phase is improved with Nb element congregation in it by analysis of crystallization model.The residual amorphous phase with high Nb content can enhance antioxidant ability and restrain the growth of grains.
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