Spinodal decomposition, chemical and magnetic ordering in Cu–Al–Mn shape memory alloys

Single crystal alloys Cu-22.64 Al- 8.26 Mn and Cu-23.33 Al- 9.42 Mn (at. %) are studied by means of differential scanning calorimetry, electrical resistometry and thermomagnetic techniques. Order-disorder transitions were identified and the critical temperatures are compared with the values obtained...

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Bibliographic Details
Published in:Materials chemistry and physics 2020-05, Vol.246, p.122793, Article 122793
Main Authors: Velázquez, D., Chaparro, M.A.E., Böhnel, H.N., Romero, R., Lanzini, F.
Format: Article
Language:English
Subjects:
Atomic ordering
Computer simulation
Copper
Copper base alloys
Cu–Al–Mn
Magnetic transitions
Magnetism
Manganese
Monte Carlo simulations
Order-disorder transformations
Shape memory alloys
Single crystals
Spinodal decomposition
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Summary:Single crystal alloys Cu-22.64 Al- 8.26 Mn and Cu-23.33 Al- 9.42 Mn (at. %) are studied by means of differential scanning calorimetry, electrical resistometry and thermomagnetic techniques. Order-disorder transitions were identified and the critical temperatures are compared with the values obtained by Monte Carlo simulations. Evidences of spinodal decomposition and magnetic transitions are discussed. •Two Cu–Al–Mn alloys are characterized by DSC, ER and thermomagnetic techniques.•The temperatures of atomic ordering transitions are determined.•Atomic ordering temperatures are reproduced by means of Monte Carlo simulations.•Depending on the thermal treatment, one or two magnetic transitions are found.•An interpretation for the thermal hysteresis of the magnetic reaction is given.
ISSN:0254-0584
1879-3312
DOI:10.1016/j.matchemphys.2020.122793