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Thermomagnetic gravimetry study of crystallization behaviour in amorphous Fe-Si-B-Nb alloys

机译:热磁重量法研究非晶态Fe-Si-B-Nb合金的结晶行为

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The effect of the Nb content on the crystallization process of amorphous Fe_(84-x)Si_6B_(10)Nb_x alloys has been investigated using thermomagnetic gravimetry (TMG). In the TMG measurement, the sample weight was electronically zero-balanced, and then an apparent weight (AW) applied by placing a magnet beneath the sample pan. The heating treatment was carried out over temperature range between 373 and 1093 K, in order to detect the formation of a ferromagnetic crystallization-induced phase. The form of the TMG curve changed markedly in the vicinity of 2-3 at.% Nb. In the alloys containing less than 2 at.% Nb, a two-stage increase in AW was observed with increasing temperature, but only a single-stage increase occurred for the alloys containing more than 3 at.% Nb. On the basis of these results, it is inferred that the Nb content plays a key role in the structure of the amorphous phase, supporting our recent claim for a mechanism of nanocrystallization.
机译:使用热磁重量分析法(TMG)研究了Nb含量对非晶Fe_(84-x)Si_6B_(10)Nb_x合金结晶过程的影响。在TMG测量中,对样品重量进行电子零平衡,然后通过将磁体放在样品盘下方来施加表观重量(AW)。为了检测铁磁结晶诱导相的形成,在373〜1093K的温度范围内进行了加热处理。 TMG曲线的形式在2-3at。%Nb附近显着变化。在含有少于2 at。%Nb的合金中,随着温度的升高,观察到AW呈两阶段增加,但是对于含有超过3 at。%的Nb的合金,只有单阶段增加。根据这些结果,可以推断出Nb含量在非晶相的结构中起着关键作用,这支持了我们最近对纳米晶化机理的主张。

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