Investigation on magnetic properties of mechanically alloyed τ-MnAlC with Fe addition

• Published in: Journal of magnetism and magnetic materials Vol. 546; p. 168892
• Main Authors: Nguyen, Van Tang, Mazaleyrat, Frédéric, Calvayrac, Florent, Ngo, Quang Minh, Randrianantoandro, Nirina
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15.03.2022; Elsevier BV; Elsevier
• Subjects: Coercivity; Computational Physics; Crystallography; Curie temperature; High temperature; Iron; Magnetic moments; Magnetic properties; Magnetism; Manganese; Mechanical alloying; MnFeAlC alloy; Physics; Reduction; Temperature; Thermal stability; Thermal Stability, Magnetic properties; Transformation temperature; Thermal Stability, Magnetic properties; Mechanical alloying; MnFeAlC alloy; Thermal Stability; Magnetic properties
• ISSN: 0304-8853; 1873-4766
• DOI: 10.1016/j.jmmm.2021.168892

•High purity of τ-Mn51-xFexAl47C2 (x = 0, 0.5, 1, 2, and 4) up to 98% was obtained.•Thermal stability of both ε and τ phases was enhanced by the addition of Fe.•Ms and TC of Fe doped τ-MnAlC showed a reduction compared to iron free τ-MnAlC.•Calculation showed a smaller magnetic moment of Fe compared to Mn in τ-Mn(Fe)AlC. The influence of Fe addition on thermal stability, crystallography, and magnetic properties of τ-Mn51Al47C2 was investigated. Alloys with composition Mn51-xFexAl47C2 (x = 0, 0.5, 1, 2, and 4) were synthesized by mechanical alloying method. High purity of τ-Mn(Fe)AlC up to 98% could be obtained after 10 h of milling, then annealed at 1050 °C for 1 h, and followed by an aging process at appropriate temperatures from 515 to 540 °C for 50 min. It was found that the thermal stability of both ε and τ phases was enhanced by the addition of Fe up to 4 at.% into MnAlC alloy through a shifting of ε-to-τ transformation temperature to high temperature region and a reduction in c/a ratio of Fe doped τ-MnAlC compared to iron free τ-MnAlC. While the magnetization and Curie temperature of Fe doped τ-MnAlC showed a reduction compared to iron free τ-Mn51Al47C2, coercivity seems not to be significantly affected. Ab initio calculation showed a lower magnetic moment of Fe (μFe = 1.77 μB) compared to Mn (μMn_average = 2.36 μB) in τ-Mn(Fe)AlC when Fe substituted Mn position at 1a site.