Theoretical justification of the magnetic phase diagram of CuMn alloys

Chowdhury, Debashish; Harders, T.M.; Mookerjee, Abhijit; Gibbs, P.

doi:10.1016/0038-1098(86)90331-5

Solid State Communications

1986

DOI: 10.1016/0038-1098(86)90331-5

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Theoretical justification of the magnetic phase diagram of CuMn alloys

Debashish Chowdhury

T.M. Harders

Abhijit Mookerjee

et al.

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1993

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Cited by 4 publications

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“…These mixed or randomly canted structures with averaged canting angle of 51 were proposed by Tsunoda and Nakai [31]. Using a parameter fitted random Heisenberg model Chowdhury et al [32] showed that a mean-field description of the phase diagram reproduced most aspects of the experimental data of the work of Gibbs et al [13]. The unsatisfactory part of that work was the fitting of the values for the pair energies and the assumption that these were independent of the alloy composition.…”

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confidence: 94%

Magnetic phase diagram for CuMn

Chouhan

Mookerjee

2011

Journal of Magnetism and Magnetic Materials

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mentioning

confidence: 94%

Magnetic phase diagram for CuMn

Chouhan

Mookerjee

2011

Journal of Magnetism and Magnetic Materials

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“…Alloys of (Cu, γMn)-phase demonstrate magnetic properties that essentially depend on concentration, temperature, and heat treatment regime [4,[26][27][28]. In [14] a magnetic phase diagram of (Cu, γMn) is presented.…”

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confidence: 99%

Phase equilibria and thermodynamics of binary copper systems with 3d-metals. IV. Copper-manganese system

Турчанин

Agraval

Abdulov

2006

Powder Metall Met Ceram

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669.35:536.717 Thermodynamic properties of alloys and phase diagram of Cu − Mn system have been assessed in the spirit of the CALPHAD-approach using simultaneously data about thermodynamic properties of phases and their equilibria. Thermodynamic data are known only for liquid and (Cu, γMn)-phase, model parameters for (δMn)-and (βMn)-phases were therefore estimated using phase equilibria data. The excess Gibbs free energy of phases is described by models with Redlich-Kister polynomials. The models of Gibbs free energy of liquid and (Cu, γMn)-phase take into account excess heat capacity of these phases. Thermodynamic model of the system provides a self-consistent description of all thermodynamic values and phase equilibria, including metastable immiscibility of (Cu, γMn)-phase in close agreement with experimental data. Low-temperature part of the diagram is added in accordance with published data on ordering reactions in (Cu, γMn)-phase.Interaction of copper and manganese remains an object of intent attention of researchers for more than one hundred years. Initially the interest was caused by the favorable combination of mechanical and technological properties of binary alloys of the system and multicomponent compositions based on them. In addition to a good workability, manganese bronzes exhibit high-temperature strength and corrosion resistance [1]. Manganese is an effective modifying addition to cast brass, favorably affecting their technological properties [2] at the same time. To particular physical properties of the copper − manganese system it is possible to refer their high electrical resistivity [3], which not really depends on temperature, and a wide spectrum of magnetic transformations including paramagnetism, antiferromagnetism, and transition into the state of spin glasses [3,4]. Subsequently it was established [5, 6] that alloys rich in manganese have typical combination of high strength and plasticity with very high damping capacity. These alloys effectively absorb the energy of mechanical vibration and thus may be used as construction materials in order to prevent noise and vibration [7]. The alloys rich in manganese demonstrate a reversible shape memory effect [8] that makes them promising for use as an activator material in micromachines [9].The copper − manganese system is one of the few systems in which two transition metals differing markedly in properties demonstrate total mutual solubility. Resulting solid solution shows a tendency towards ordering in the range of copper rich alloys, and a tendency towards metastable immiscibility in the range of manganese rich alloys. All of it makes copper − manganese system an notheworthy object for study by both modern material science and fundamental investigations. PHASE EQUILIBRIAStable transformations. A review of work devoted to studying the phase equilibria in the system carried out before 1939 is given in [10][11][12]. By the opinion of authors [10] most part of obtained results contain errors connected with the fact that manganese used in expe...

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The cu-mn (copper-manganese) system

Gokcen¹

1993

JPE

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Theoretical justification of the magnetic phase diagram of CuMn alloys

Cited by 4 publications

References 13 publications

Magnetic phase diagram for CuMn

Magnetic phase diagram for CuMn

Phase equilibria and thermodynamics of binary copper systems with 3d-metals. IV. Copper-manganese system

The cu-mn (copper-manganese) system

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