Thermal dependence of structural and magnetic properties in an amorphous Fe-Si-B-Cu alloy

Dai, Jinyue; Wang, Y.G.; Yang, Liang; Xia, G.T.; Zeng, Qiaoshi; Lou, Hongbo

doi:10.1016/j.jallcom.2016.10.255

Cited by 18 publications

(1 citation statement)

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“…In Figure 29 the influence of Cu as a nucleating element can readily be recognized. The role of Cu addition is not solely to ensure the formation of homogeneous nuclei for the evolution of the nanograin structure, but it also plays an active role in enhancing the peak separation arising from the α-Fe and Fe 3 B formation [111]. The suppression of Fe 3 B crystalline phase formation is highly desirable to avoid magnetic hardening.…”

Section: Cluster-phenomena In the Mechanism Of The Amorphous-nanocrys...mentioning

confidence: 99%

Cluster-Related Phenomena in the Properties and Transformations of Transition Metal-Based Glassy Alloys

Lovas

Ramasamy

Szabó

et al. 2020

Metals

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A survey of the cluster formation tendency and mechanism in transition metal-based glassy alloys is made with an emphasis on their manifestation in various physical properties. The cluster formation is partially inherited from the supercooling of the melt. However, it also develops due to the interaction between dissolved hydrogen and the frozen glassy structure. The glassy state as “cluster assembly” is regarded as a structural background for the interpretation of several anomalous concentration dependences of thermal and magnetic properties in these glasses. We will focus on the manifestation of alloying effects, the relation between irreversible and reversible structural relaxations both in the high, and low temperature range (observed near to the glass transition or after low temperature storage). The development of the cluster assembly is the consequence of the co-existence of various bonding types between the alloy components. These are brought together in the melt, ensuring sufficient glass-forming ability. The nucleation mechanism of the amorphous-nanocrystalline transformation is also explained as a cluster phenomenon, which significantly contributes to the evolution of magnetic ultra-softness in FINEMET-type alloys. Finally, the role of the quenched-in cluster structure in the mechanism of reversible and irreversible H-absorption is discussed. Irreversible H-induced structural rearrangements can appear as microphase separation in multicomponent systems, governed by the affinity difference between the metallic components and the absorbed hydrogen. This kind of H-induced reordering is responsible for the “volume activation” of amorphous H-storage alloys and it also causes the gradual breakdown of storage capacity during cyclic absorption–desorption steps. This article mainly focuses on the cluster phenomena in Fe-based glasses because of its unique combination of high mechanical strength, strong corrosion resistance, good thermal stability and excellent magnetic properties.

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Section: Cluster-phenomena In the Mechanism Of The Amorphous-nanocrys...mentioning

confidence: 99%