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Ordering in ternary BCC alloys applied to the Al-Fe-Mn system
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Computational Thermodynamics.ORCID iD: 0000-0001-9010-525X
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Computational Thermodynamics.ORCID iD: 0000-0001-5031-919X
2015 (English)In: Calphad, ISSN 0364-5916, E-ISSN 1873-2984, Vol. 51, 211-219 p.Article in journal (Refereed) PublishedText
Abstract [en]

TWIP (TWinning Induced Plasticity) steels are attracting a lot of attention due to their combination of strength and ductility. In a previous work [1] (B. Lindahl, M. Selleby, Calphad 43 (2013) 86-93) a thermodynamic assessment of the Al-Fe-Mn system, which forms the basis of TWIP steels, was presented. The previous assessment treated the A2/B2 order-disorder transformation in the bcc phase using a two-sublattice model. In the present work a four-sublattice model has been used in order to also be able to describe the transition into the ordered DO3 compound that occurs at lower temperatures. pair interaction energies for the Fe-Mn system are evaluated which prove crucial to the extrapolations into the Al-Fe-Mn system. Along with this various aspects of modeling chemical ordering using the Calphad approach are discussed. Equations for determining the ternary compound energies from binary pair interactions energies are presented and equations for determining the parameter values from the ordered parameters are derived.

Place, publisher, year, edition, pages
Elsevier, 2015. Vol. 51, 211-219 p.
Keyword [en]
CALPHAD, Al-Fe-Mn, Order-disorder, Thermodynamic modeling, B2, DO3, B32, L2(1), 4SL
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-180610DOI: 10.1016/j.calphad.2015.09.008ISI: 000366790500022ScopusID: 2-s2.0-84944313603OAI: oai:DiVA.org:kth-180610DiVA: diva2:896125
Note

QC 20160120

Available from: 2016-01-20 Created: 2016-01-19 Last updated: 2016-02-05Bibliographically approved

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