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Structural relaxation and associated Delta E effect in the Fe-Cu-Nb-Si-B system

机译:Fe-Cu-Nb-Si-B系统中的结构弛豫和相关的Delta E效应

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The microstructural evolution from the amorphous to nanocrystalline phase in the Fe73.5Cu1Nb3Si13.5B9 alloy produced by planar flow casting was studied by performing Young's modulus, internal friction and initial susceptibility measurements against temperature on as-cast ribbons and on samples submitted to selected furnace heating treatments. Moreover, the room-temperature magnetoelastic behaviour in the as-prepared ribbons and in samples annealed in the 570-850 K range was investigated through the analysis of the Delta E effect. The results indicate that a structural relaxation process of the amorphous phase occurs starting from 450-500 K. In particular, a strong magnetoelastic response observed in samples annealed in the 710-745 K range, namely at temperatures very close to the nanocrystallization temperature (760-770 K), suggests an increase in the saturation magnetostriction with respect to the as-cast alloy, connected with atomic rearrangements causing a compositional fluctuation in the amorphous phase.
机译:通过对铸态薄带和提交给选定炉膛加热的样品进行杨氏模量,内摩擦和对温度的初始磁化率测量,研究了平面流铸生产的Fe73.5Cu1Nb3Si13.5B9合金从非晶相到纳米晶相的微观结构演变。治疗。此外,通过对ΔE效应的分析,研究了在准备好的薄带中和在570-850 K范围内退火的样品中的室温磁弹性行为。结果表明,非晶相的结构弛豫过程始于450-500K。特别是,在710-745 K范围内(即非常接近纳米晶化温度的温度(760))退火的样品中观察到了强烈的磁弹性响应。 -770K)表明相对于铸态合金的饱和磁致伸缩增加,与原子重排有关,原子重排导致非晶相中的成分波动。

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