The influence of chromium on the changes in phase constitution and electrical properties of amorphous Co73-xFe4CrxSi12B11 microwires during crystallization

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics Pub Date : 2025-05-21 DOI:10.1016/j.intermet.2025.108848

Gennady N. Elmanov , Ilya V. Kozlov , Aida E. Sarakueva , Vladimir I. Odintsov , Margarita N. Churyukanova , Sergey A. Gudoshnikov

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Abstract

The influence of chromium on the crystallization processes (temperature and thermal effect of two crystallization stages, as well as the nature of phase composition change during crystallization) of amorphous Co_73-xFe₄Cr_xSi₁₂B₁₁ (x = 0, 2, 4) alloys obtained in the form of microwires in a glass shell was studied. It was shown that if at the 1st crystallization stage of alloys with chromium there is a simultaneous precipitation of two crystalline phases (HCP phase of a solid solution based on cobalt and BCC-phase of Co₂Si) leading to the formation of a lamellar structure, then in the absence of chromium, only the BCC-phase is initially released. The influence of chromium on the increase in the activation energy of the 1st crystallization stage was determined. It was shown that at the 2nd crystallization stage the presence of chromium stabilizes the HCP-Co and Co₂₃B₆ phases. It is also shown that an increase in the Cr concentration from 0 to 4 at.% increases the specific electrical resistance ρ_25 °C of the alloys in the crystalline state from 0.68 ∙ 10⁻⁶ to 1.18 ∙ 10⁻⁶ Ohm ∙ m and simultaneously reduces the thermal coefficient of electrical resistance by 4 times. Based on the resistive measurement data, the Curie temperatures of the magnetic phases formed during crystallization were estimated. Comparison of the data obtained using the DSC and XRPD methods with the results of changes in electrical resistance during crystallization made it possible to interpret the results of resistive measurements and to demonstrate the efficiency of this simple method for studying the crystallization process of amorphous alloys.

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研究了铬对Co73-xFe4CrxSi12B11非晶微线结晶过程中相组成和电学性能变化的影响

研究了铬对Co73-xFe4CrxSi12B11 （x = 0,2,4）非晶态微丝玻璃壳微丝合金结晶过程的影响（两个结晶阶段的温度和热效应以及结晶过程中相组成变化的性质）。结果表明，如果在含铬合金的第一个结晶阶段同时析出两种晶相（基于钴的固溶体的HCP相和Co2Si的bcc相），导致层状结构的形成，那么在不含铬的情况下，最初只释放bcc相。测定了铬对第一结晶阶段活化能提高的影响。结果表明，在第二结晶阶段，铬的存在使HCP-Co和Co23B6相稳定。结果表明，Cr浓度从0增加到4。%使合金在结晶状态下的比电阻ρ25°C从0.68∙10−6提高到1.18∙10−6 Ohm∙m，同时使电阻热系数降低4倍。根据电阻测量数据，估计了结晶过程中形成的磁相的居里温度。用DSC和XRPD方法获得的数据与结晶过程中电阻变化的结果进行比较，可以解释电阻测量的结果，并证明了这种简单方法研究非晶合金结晶过程的效率。

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来源期刊

Intermetallics 工程技术-材料科学：综合

CiteScore

7.80

自引率

9.10%

发文量

291

审稿时长

37 days

期刊介绍： This journal is a platform for publishing innovative research and overviews for advancing our understanding of the structure, property, and functionality of complex metallic alloys, including intermetallics, metallic glasses, and high entropy alloys. The journal reports the science and engineering of metallic materials in the following aspects: Theories and experiments which address the relationship between property and structure in all length scales. Physical modeling and numerical simulations which provide a comprehensive understanding of experimental observations. Stimulated methodologies to characterize the structure and chemistry of materials that correlate the properties. Technological applications resulting from the understanding of property-structure relationship in materials. Novel and cutting-edge results warranting rapid communication. The journal also publishes special issues on selected topics and overviews by invitation only.