Enhanced Soft Magnetic Properties of CoNi-Based High Entropy Alloys
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ORIGINAL PAPER
Enhanced Soft Magnetic Properties of CoNi-Based High Entropy Alloys A. Ghasemi 1 & Kh. Zamani 1 & M. Tavoosi 1 & Gh.R. Gordani 1 Received: 12 April 2020 / Accepted: 16 June 2020 # Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract High entropy alloys (HEA) based on CoNi systems contain of Mn, Cr, and Al elements were prepared through mechanical alloying and subsequent annealing method. The structural and magnetic properties of CoNi alloy system were discussed based on the results of X-ray diffraction (XRD), scanning electron microscopy (SEM), differential scanning calorimetry (DSC), and vibrating sample magnetometer (VSM) analysis methods. There were different chemical compounds formed in CoNi-Mn-Cr samples, while a simple solid solution phase with FCC or BCC structural evolved in CoNiMnCrAl high entropy alloy after mechanical milling and subsequent annealing process at 750 and 900 °C. This sample exhibited excellent soft magnetic properties with the saturation magnetization and coercivity of about 31 emu/g and 39 Oe, respectively, after annealing at 750 °C. Annealing at 900 °C could improve soft magnetic properties of CoNiMnCrAl high entropy alloy in the range of 58 emu/g for saturation of magnetization and 18 Oe for coercivity due to the formation of a single solid solution phase with BCC structure. Keywords High entropy alloy . Soft magnet . Annealing . Magnetic properties
1 Introduction Development of advanced materials with improved mechanical and physical properties has been the main motivation for researchers in recent years. In this regard, Yeh et al. [1], at 2004, succeeded to produce an alloy with several principal elements with equal or about equal atomic ratio; named high entropy alloys. High entropy alloys are the solid solutions with at least 5 principle elements with almost equal atomic ratio which varies from 5 to 35. The high statistical entropy in these alloys causes to the formation of simple solid solution phases of FCC, BCC, or a combination of both, or even an amorphous structure. These alloys exhibit excellent properties such as high strength, high hardness, good wear resistance, and high thermal stability, which show great potential for practical applications [2–7]. The microstructures as well as physical and mechanical properties of high entropy alloys greatly depend on elements * M. Tavoosi [email protected] 1
Department of Material Engineering, Malek Ashtar University of Technology, Shahr, Iran
involved in the alloys and the chemical composition. For instance, the effects of Zn and Cu on structural properties of CuNiCoZnAlTi system were reported by Valarkashmi et al. [8]. Zhang et al. [9] have been studied the effect of Ti on structural properties of the CoCrFeNiTiAl alloy, and the effects of Co on structural properties of FeNiCrCo0.3Al0.7 alloy system were reported by Chen et al. [10]. However, considerable research efforts on high entropy alloys focus on their microstructures and mechanical properties while there is raising interest in dev
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