Investigation of phase selection hierarchy in Mn–Al alloys

Date

2019-12-01

Author

Genc, Ayse Merve
Acar, Ozgun
Turan, Servet
Kalay, Ilkay
Savacı, Umut
Kalay, Yunus Eren

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

54
views

0
downloads

Primarily attributed to the formation of the ferromagnetic τ-phase, near equiatomic composition of Mn–Al have recently received much attention in permanent magnet industry. Several mechanisms have been proposed in literature for the τ-phase formation but controversy still arises regarding the dominating mode. In the current work, MnAl-based alloys having different compositions in a range between Mn50.5Al49.5 and Mn57Al43 have been studied by means of in-situ high energy X-ray diffraction, differential scanning calorimetry (DSC) and magnetic measurements. Synchrotron and DSC experiments showed the dependence of the τ-MnAl on the intermediate disordered ε0-phase. Alloys having 53.4 at% or less Mn (S1, S2) followed a transformation route of εþε’→τ→βþγ2 upon annealing. Alloys having more than 53.4 at% of Mn had only ε-phase. High energy X-ray diffraction pat-terns showed that ε-phase directly transformed into stable phases in the absence of ε0-phase. It is observed that ε0not only promoted the ferromagnetic τ-phase but also stabilized it by delaying the nucleation of stable phases

Subject Keywords

Mechanical Engineering, Materials Chemistry, Mechanics of Materials, General Chemistry, Metals and Alloys

URI

https://hdl.handle.net/11511/36880

Journal

Intermetallics

DOI

https://doi.org/10.1016/j.intermet.2019.106617

Collections

Department of Metallurgical and Materials Engineering, Article

Suggestions

OpenMETU
Core

The investigation of electronic, anisotropic elastic and lattice dynamical properties of MAB phase nanolaminated ternary borides: M 2 AlB 2 ( M = Mn , Fe and Co ) under spin effects Surucu, Gokhan; YILDIZ, BUĞRA; Erkisi, Aytac; Wang, Xiaotian; Surucu, Ozge (Elsevier BV, 2020-10-01) In the present study, the structural, electronic, magnetic, anisotropic elastic and lattice dynamic properties of the ternary metal borides (, and ) known as MAB phases have been investigated by density functional theory. The obtained results from the structural optimizations show that all these compounds have negative formation enthalpy implying the thermodynamic stability and synthesizability. The spin effects on the phases have been studied with the plotted energy-volume curves for different magnetic pha...
The structural and electronic properties of BAs and BP compounds and BPxAs1-x alloys Mohammad, Rezek; Katırcıoğlu, Şenay (Elsevier BV, 2009-10-19) The structural and electronic properties of BAs and BP compounds and BPxAs1-x alloys have been investigated by full potential linearized augmented plane wave (FP-LAPW) method based on DFT The total energies and electronic band structures of these compounds have been calculated for different approximations of exchange-correlation energy. The comparative study has showed that the PW-GGA is the best one to produce the measured structural quantities of the compounds. such as the lattice constant, bulk modulus, ...
The structural and electronic properties of BN and BP compounds and BNxP1-x alloys Mohammad, Rezek; Katırcıoğlu, Şenay (Elsevier BV, 2009-06-10) The structural and electronic properties of BN and BP compounds and BNxP1-x alloys have been investigated by full potential linearized augmented plane wave (FP-LAPW) method based on density functional theory (DFT). The total energies and electronic band structures of these compounds have been calculated for different approximations of exchange-correlation energy. The comparative study has showed that the Perdew-Wang-generalized gradient approximation (PW-GGA) is the best one to produce the measured structur...
Production of in situ aluminum-titanium diboride master alloy formed by slag-metal reaction CHANGIZI, Ahmad; Kalkanlı, Ali; SEVINC, NACİ (Elsevier BV, 2011-01-12) Al-TiB(2) master alloys have received much attention in recent years owing to their potential as efficient grain refiners for aluminum foundry alloys. In this study, the process of production of master alloys was investigated to develop a low cost method, namely, slag-metal reaction. This method can be used to fabricate Al-TiB2 master alloy in situ from the TiO(2)-H(3)BO(3)-Na(3)AlF(6) and Al system. Since the price of the raw materials is low and the technology is simple, the processing technique appears t...
Finding optimal Fe/Ba ratio to obtain single phase BaFe12O19 prepared by ammonium nitrate melt technique Topal, Ugur; Ozkan, Husnu; Dorosinskii, Lev (Elsevier BV, 2007-01-31) In the present work, the magnetic properties and the phase composition of barium ferrite BaFe12O19 powders prepared by the ammonium nitrate melt technique with Fe/Ba ratios varying from 2 to 13 was investigated. We observed that BaFe2O4 phase is formed at low values of Fe/Ba ratios (2-6) and alpha-Fe2O3 phase is formed at high values of Fe/Ba ratio as secondary phases. BaFe2O4 phase could be easily eliminated from the structure by washing the annealed powders with diluted HCI.HCI-washing is not effective fo...

Citation Formats

A. M. Genc, O. Acar, S. Turan, I. Kalay, U. Savacı, and Y. E. Kalay, “Investigation of phase selection hierarchy in Mn–Al alloys,” Intermetallics, pp. 0–0, 2019, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/36880.