Thermodynamic assessment and experimental investigation of the systems Al–Fe–Mn and Al–Fe–Mn–Ni. (September 2019)

• Record Type: Journal Article
• Authors: Walnsch, Alexander; Kriegel, Mario J.; Fabrichnaya, Olga; Leineweber, Andreas
• Is Part Of: Calphad. Volume 66(2019)
• Publication Date: 2019-09
• Subjects: Phase diagrams -- Data processing -- Periodicals; Thermochemistry -- Data processing -- Periodicals; Diagrammes de phases -- Informatique -- Périodiques; Thermochimie -- Informatique -- Périodiques; Thermodynamica; Electronic journals; 541.363
• DOI: 10.1016/j.calphad.2019.04.006
• Languages: English
• ISSNs: 0364-5916

Abstract

Abstract: The ternary Al–Fe–Mn and the quaternary Al–Fe–Mn–Ni systems were re-assessed/assessed with special emphasis on compositions relevant for Fe-based shape memory alloys (SMAs), to further improve materials properties and to reliably predict phase transformation in these systems. The thermodynamic assessment was based on literature data, as well as experimental investigations regarding the phase equilibria formed between the phases A 1, A 2, B 2 and β-Mn. Key isothermal sections were studied at 725 and 1000 °C in the Al–Fe–Mn system and at 1000 and 1175 °C in the Al–Fe–Mn–Ni system, respectively. For the quaternary Al–Fe–Mn–Ni system, additional diffusion-couple experiments were conducted to investigate target regions of the phase diagram. Calculations based on the present description are in excellent agreement with the data available in literature and the experimental investigations of the present work for both, the Al–Fe–Mn and the Al–Fe–Mn–Ni systems. Highlights: Thermodynamic assessment of the Al–Fe–Mn–Ni system was developed for the first time. Thermodynamic description of the Al–Fe–Mn system was refined at the Fe–Mn rich side. Phase equilibria were investigated using diffusion couples and conventional alloys. Phase relations between A 1, A 2 and β-Mn were re-investigated in the Al–Fe–Mn system. First- and second-order transitions were detected using diffusion couple analyses.