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用α粒子径迹法考察经硼微合金化后的 Fe_3(SiAl)合金在部分有序状态下的硼分布,用透射电镜观察反相畴,结果表明硼含量在 Fe(SiAl)合金中存在一临界浓度约150ppm。硼含量低于此临界浓度时,硼在晶内的大量反相畴界上呈均匀分布,降低了长程有序度和反相畴界能,从而改善了该化合物的脆性;高于此临界浓度时,硼开始在晶界上偏聚,晶内出现贫硼区,削弱了硼在晶内畴界上均匀分布带来的降低反相畴界能和改善化合物脆性的有益作用。硼与反相畴界之间可能存在化学交互作用。
The distribution of boron in the partially ordered state of Fe_3 (SiAl) alloy after boron micro-alloying was investigated by means of α-particle track method. The reversed-phase domains were observed by transmission electron microscopy. The results show that boron content exists in Fe The critical concentration is about 150ppm. When the boron content is lower than the critical concentration, the boron is uniformly distributed on a large number of antiphase boundaries in the crystal, reducing the long range order degree and the antiphase domain boundary energy, thereby improving the brittleness of the compound; when the boron content is higher than the critical concentration Boron begins to segregate at the grain boundaries, resulting in the presence of boron-poor regions in the grains, which weakens the beneficial effect of decreasing the inversion domain boundaries and improving the brittleness of the compounds due to the uniform distribution of boron in the grain boundaries. There may be a chemical interaction between boron and the opposite domain.