Shi-chang Qiao , Na Li , Xin-yu Gao , Xin Wen , Feng-zhen Wang , Zhi-kang Xia , Yong-qiang Wang , Jin-zhe Jiang , Shuai Liu , Chao Yuan
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Low plastic deformation: Its impact on the microstructural evolution during heat treatment of nickel-based wrought superalloy GH4698
A comprehensive investigation into the effects of low plastic deformation (LPD) at ambient temperature on the microstructural evolution of the nickel-based wrought superalloy GH4698 during solution heat treatment (SHT) was conducted. Applying 2%–10 % LPD to cylindrical specimens did not markedly alter the grain morphology. However, a portion of the initial annealing twin boundaries (TBs) would transform into other types of grain boundaries under the application of the stress field. Deformation microstructures with effective strains ranging from 0.025 to 0.042 (corresponding to the entire region of the 4 % deformed sample and the near-end region of the 6 % deformed sample) exhibited a pronounced increase in twin fraction during SHT, accompanied by the formation of multiple large twin-related domains (TRDs) and several abnormally large grains (ALGs). The occurrence of TRDs and their internal ALGs stems from the constrained nucleation of recrystallization and extensive twinning. The residual strain energy not alleviated through recrystallization, driven by thermal stress, initiates twin nucleation and promotes grain boundary migration. The emergence and disappearance of island-like twins, as well as twins terminating within grains, suggest that the introduced TBs include not only coherent TBs but also potentially highly mobile incoherent TBs during the evolution of TRDs.
期刊介绍:
This journal is a platform for publishing innovative research and overviews for advancing our understanding of the structure, property, and functionality of complex metallic alloys, including intermetallics, metallic glasses, and high entropy alloys.
The journal reports the science and engineering of metallic materials in the following aspects:
Theories and experiments which address the relationship between property and structure in all length scales.
Physical modeling and numerical simulations which provide a comprehensive understanding of experimental observations.
Stimulated methodologies to characterize the structure and chemistry of materials that correlate the properties.
Technological applications resulting from the understanding of property-structure relationship in materials.
Novel and cutting-edge results warranting rapid communication.
The journal also publishes special issues on selected topics and overviews by invitation only.