Recovery facilitated by interphase boundary motion circumvents recrystallization in superalloy single crystals

Hongfei Zhang; Kai Chen; Sicong Lin; Rui Fu; Bozhao Zhang; Jun Ding; Zongqiang Feng; Xiaoxu Huang; Evan Ma

doi:10.1080/21663831.2024.2312146

Materials Research Letters (Mar 2024)

Recovery facilitated by interphase boundary motion circumvents recrystallization in superalloy single crystals

Hongfei Zhang,
Kai Chen,
Sicong Lin,
Rui Fu,
Bozhao Zhang,
Jun Ding,
Zongqiang Feng,
Xiaoxu Huang,
Evan Ma

Affiliations

Hongfei Zhang: State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an, People’s Republic of China
Kai Chen: State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an, People’s Republic of China
Sicong Lin: State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an, People’s Republic of China
Rui Fu: International Joint Laboratory for Light Alloys (MOE), College of Materials Science and Engineering, Chongqing University, Chongqing, People’s Republic of China
Bozhao Zhang: State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an, People’s Republic of China
Jun Ding: State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an, People’s Republic of China
Zongqiang Feng: International Joint Laboratory for Light Alloys (MOE), College of Materials Science and Engineering, Chongqing University, Chongqing, People’s Republic of China
Xiaoxu Huang: International Joint Laboratory for Light Alloys (MOE), College of Materials Science and Engineering, Chongqing University, Chongqing, People’s Republic of China
Evan Ma: State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an, People’s Republic of China

DOI: https://doi.org/10.1080/21663831.2024.2312146
Journal volume & issue: Vol. 12, no. 3
pp. 180 – 189

Abstract

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Dislocation recovery lowering the driving force for recrystallization would be able to suppress the latter in Ni-based superalloy single crystals, but was believed unlikely due to their low stacking-fault energy. Defying this traditional wisdom, here we show that efficient recovery can be realized once the γ′-precipitates start to dissolve. Our microscopy evidence tracking the distribution/configuration of dislocations reveals that the shifting γ/γ′ interphase boundaries release the dislocations trapped there, facilitating their annihilation and rearrangement into low-energy network configurations. Our finding explains the success of a recent recovery protocol that kept superalloys as single crystals after supersolvus homogenization heat treatment.

Published in Materials Research Letters

ISSN: 2166-3831 (Online)
Publisher: Taylor & Francis Group
Country of publisher: United Kingdom
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: https://www.tandfonline.com/journals/tmrl

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