Comment on "The two-step nucleation of G-phase in ferrite", the authors: Y. Matsukawa et al. Acta Mater 2016; 116:104–133. (1st April 2019)

• Record Type: Journal Article
• Authors: King, D.J.M.; Wenman, M.R.
• Is Part Of: Scripta materialia. Number 163(2019)
• Page Start: 163
• Page End: 165
• Publication Date: 2019-04-01
• Subjects: G-phase -- Ferrite -- Transmission electron microscopy -- Density functional theory; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2018.11.053
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Recently, Matsukawa et al. [1] published a paper investigating the nucleation and growth of Mn6 Ni16 Si7 G-phase precipitates in duplex stainless steel using experimental and theoretical techniques. The G-phase cubic unit cells simulated by the authors for the theoretical analysis are non-physical, with lattice parameters of ≤0.550 nm, leading to a partially erroneous conclusion regarding the structure of the observed precipitates. In this comment we use density functional theory results from our previous study of the G-phase [2] to offer an alternative explanation to the experimental observations made by Matsukawa et al., viz, the Mn-Ni-Si precipitate is in an intermediate P1 structure, resulting from an energy minimum, in the transformation from BCC packing to G-phase.