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Deformation-induced phase transformation in 4H-SiC nanopillars
Chen B; Wang J(王军); Zhu YW; Liao XZ; Lu CS; Mai YW; Ringer SP; Ke FJ(柯孚久); Shen YG; Liao, XZ (reprint author), Univ Sydney, Sch Aerosp Mech & Mechatron Engn, Sydney, NSW 2006, Australia.
Source PublicationActa Materialia
AbstractThe deformation behaviour of single-crystal SiC nanopillars was studied by a combination of in situ deformation transmission electron microscopy and molecular dynamics simulations. An unexpected deformation-induced phase transformation from the 4H hexagonal structure to the 3C face-centred cubic structure was observed in these nanopillars at room temperature. Atomistic simulations revealed that the 4H to 3C phase transformation follows a stick-slip process with initiation and end stresses of 12.1-14.0 and 7.9-9.0 GPa, respectively. The experimentally measured stress of 9-10 GPa for the phase transformation falls within the range of these theoretical upper and lower stresses. The reasons for the phase transformation are discussed. The finding sheds light on the understanding of phase transformation in polytypic materials at low temperature. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
KeywordSic Nanopillars Phase Transformation In Situ Deformation Transmission Electron Microscopy Molecular Dynamics
Subject AreaMaterials Science ; Metallurgy & Metallurgical Engineering
Indexed BySCI ; EI
WOS IDWOS:000344208300035
Funding OrganizationWe are grateful for the scientific and technical input and support from the Australian Microscopy and Microanalysis Research Facility node at the University of Sydney: Sydney Microscopy & Microanalysis. This research has been supported by the Australian Research Council (DP0985450 and FT110100236), the National Natural Science Foundation of China (Grant Nos. 11172024, 11232013 and 11372022), the National Basic Research Program of China (2012CB937500), the Opening Fund of State Key Laboratory of Nonlinear Mechanics and the Research Grant Council of the Hong Kong Special Administrative Region, China (Project No. City U 120611 (9041679)). MD simulations were conducted at iVEC through the use of advanced computing resources located at iVEC@Murdoch. Partial computational resources were provided by the Intersect Australia Ltd.
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Cited Times:8[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorLiao, XZ (reprint author), Univ Sydney, Sch Aerosp Mech & Mechatron Engn, Sydney, NSW 2006, Australia.
Recommended Citation
GB/T 7714
Chen B,Wang J,Zhu YW,et al. Deformation-induced phase transformation in 4H-SiC nanopillars[J]. Acta Materialia,2014,80:392-399.
APA Chen B.,王军.,Zhu YW.,Liao XZ.,Lu CS.,...&Liao, XZ .(2014).Deformation-induced phase transformation in 4H-SiC nanopillars.Acta Materialia,80,392-399.
MLA Chen B,et al."Deformation-induced phase transformation in 4H-SiC nanopillars".Acta Materialia 80(2014):392-399.
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