Investigation of phase selection hierarchy in Mn–Al alloys

2019-12-01
Genc, Ayse Merve
Acar, Ozgun
Turan, Servet
Kalay, Ilkay
Savacı, Umut
Kalay, Yunus Eren
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

Suggestions

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, ...
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...
A STUDY OF IMPURITY EFFECT ON ORDERING CHARACTERISTICS OF FE3AL INTERMETALLICS
Mehrabov, Amdulla; Ozturk, T (Elsevier BV, 1994-03-01)
A study is carried out into energetical and structural characteristics of atomic ordering processes in Fe3Al. The statistico-thermodynamical theory of ordering by a quasichemical method is combined with the electronic theory of alloys in pseudopotential approximation in order to predict impurity effects on DO3 double-line arrow pointing left and right B2 phase transition temperature and the characteristics of atomic short-range order in Fe3Al-type intermetallics. Impurity elements in Fe3(Al, Me) Me-Cr, Si, ...
Effect of vanadium on atomic ordering characteristics and anti-phase boundary energies of B2-FeCo alloys
AYKOL, Muratahan; Mehrabov, Amdulla; Akdeniz, Mahmut Vedat (Elsevier BV, 2010-05-01)
Effect of V on the energetical and structural characteristics of atomic ordering processes of B2-FeCo intermetallics have been investigated via electronic theory of multi-component alloys combined with Monte Carlo (MC) simulations. Emphasis has been placed on the variation of anti-phase boundary (APB) energies with V content and temperature to establish a relationship between ductility and atomic ordering characteristics of (FeCo)(100-x)V(x) (x = 0-5 at%) alloys. It was shown that APB energies are highly af...
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.