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’

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• 作者：Jonathan Cormier^a ; ^{jonathan.cormier@ensma.fr} ; Vincenzo Caccuri^a ; Jean-Briac le Graverend^b ; Patrick Villechaise^a
• 关键词：Ni-based single crystal superalloys ; Creep ; Hyperfine γ&prime ; precipitation
• 刊名：Scripta Materialia
• 出版年：2017
• 出版时间：1 March 2017
• 年：2017
• 卷：129
• 期：Complete
• 页码：100-103
• 全文大小：878 K
• 卷排序：129

文摘

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.