Abstract
Elemental substitution is commonly used to improve the formability of metallic glasses and the properties of amorphous alloys over a wide compositional range. Therefore, it is essential to investigate the influence of element content change on the formability as well as magnetic and other properties. The purpose is to achieve tailorable properties in these alloys with enhanced glass forming ability. In this work, the glass-forming ability (GFA) and magnetic properties of the minor Mn-substituted Fe88Zr8B4 amorphous alloy were investigated. The addition of Mn improving the amorphous forming ability of the alloy. With the addition of Mn, the magnetic transition temperature, saturation magnetization and the magnetic entropy changes (−ΔSm) peaks decreased simultaneously, which is possibly caused by the antiferromagnetic coupling between Fe and Mn atoms. The dependence of −ΔSmpeak on Tc displays a positive correlation compared to the −ΔSmpeak- Tc−2/3 relationship proposed by Belo et al.
Highlights
With the deterioration of the global energy crisis and environmental pollution, it has become more and more urgent to seek clean energy, renewable energy and energysaving technologies in recent years [1,2]
The structural characteristics of the obtained alloys were ascertained by means of X-ray diffraction (XRD) on a Rigaku diffractometer using Kα radiation of copper, and the thermodynamic parameters were tested on the differential scanning calorimetry (DSC) on a NETZSCH calorimeter with the heating curves obtained at 0.333 K/s
The reduced glass transition temperature (Trg = Tg/Tl) and the parameter γ (= Tx/(Tg + Tl)), both of which are usually applied as the major reference for the glass formability (GFA) of the alloys [27,28], can be obtained to be 0.503 and 0.353 for Fe86Zr8B4Mn2, 0.506 and 0.355 for Fe83Zr8B4Mn5, 0.517 and 0.353 for Fe80Zr8B4Mn8 and 0.512 and 0.356
Summary
With the deterioration of the global energy crisis and environmental pollution, it has become more and more urgent to seek clean energy, renewable energy and energysaving technologies in recent years [1,2]. The magnetic refrigerator using a solid refrigerant is more energy efficient (up to 30% reduction of energy loss), more environmentally friendly (free of freon) and has a larger energy density (conducive to miniaturization) when compared to the freon compression machine [2,3]. The MCE characteristics of the prepared materials so far are usually evaluated by two factors: maximum magnetic entropy change (−∆Smpeak) and refrigeration capacity (RC). Intermetallic compounds, such as Gd5(SixGe1−x), La(Fe,M) (M = Si,Co,Al), MnFe(P1−xAsx), NiMnGa and LaMnO3 [5,6,7,8,9,10], exhibit a giant −∆Smpeak but relatively low RC due to their sharp and narrow magnetic entropy change (−∆Sm) peaks. The Tc and −∆Smpeak of these amorphous alloys are tailorable by randomly selecting the composition of the alloys within a certain composition range, such as the compositional-induced structural change in the ZrNi system [26]
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