Comments on 'Selective evolution of secondary γ′ precipitation in a Ni-based single crystal superalloy both in the γ matrix and at the dislocation nodes'. (1st March 2017)

• Record Type: Journal Article
• Authors: Cormier, Jonathan; Caccuri, Vincenzo; le Graverend, Jean-Briac; Villechaise, Patrick
• Is Part Of: Scripta materialia. Volume 129(2017)
• Page Start: 100
• Page End: 103
• Publication Date: 2017-03-01
• Subjects: Ni-based single crystal superalloys -- Creep -- Hyperfine γ′ precipitation; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2016.10.012
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: In a recent paper, Sisi Xiang & al. [Acta Materialia 116 (2016) 343] studied microstructure evolutions of γ′ precipitates during creep of a Ni-based single crystal superalloy, with a special focus on hyperfine γ′ particles nucleating in the γ matrix channels. This paper is misleading, claiming that hyperfine γ′ particles nucleate during high temperature creep exposure at 1100 °C. The aim of the present comments is to reconsider these results based on the available literature on hyperfine γ′ particles nucleation mechanisms and subsequent morphological evolutions at high temperature.