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Breakdown of the Hall-Petch relationship in extremely fine nanograined body-centered cubic Mo alloys
Duan, F. H.1; Naunheim, Y.2; Schuh, C. A.2; Li, Y.1
Corresponding AuthorSchuh, C. A.(schuh@mit.edu) ; Li, Y.(liyi@imr.ac.cn)
2021-07-01
Source PublicationACTA MATERIALIA
ISSN1359-6454
Volume213Pages:9
AbstractMechanical properties and deformation behavior have been studied in face-centered cubic (fcc) metals with extremely fine grain sizes, even below about 20 nm, but this range is rarely studied in the body centered cubic (bcc) metals. Here, we study the hardness and deformation behavior of bcc Mo(O) alloys with grain sizes from 120 to 4 nm, covering the range of classical Hall-Petch behavior as well as the regime where that scaling law breaks down, between about 11 and 4 nm. A hardness as high as 17.3 GPa was achieved at the strongest grain size of 11 nm, and the breakdown at smaller grain sizes is associated with a number of changes in behavior: an inflection in activation volume (associated with a change in rate dependence of deformation) and increasing shear localization. At coarser grain sizes this is associated with shear offsets at grain boundaries, pointing to an increasing prevalence of intergranular deformation (by sliding or grain rotation). At finer grain sizes localization is associated with the formation of large shear bands at scales far greater than the grain size. These behaviors are suggestive of a crossover from crystal-like to glass-like deformation behaviors at the finest grain sizes, consistent with the increasing fraction of disordered regions in the structure. (c) 2021 Published by Elsevier Ltd on behalf of Acta Materialia Inc.
KeywordNanocrystalline materials Hall-Petch breakdown Refractory bcc alloys Grain boundary Deformation behavior
Funding OrganizationShenyang National Laboratory for Materials Science ; US National Science Foundation ; NASA
DOI10.1016/j.actamat.2021.116950
Indexed BySCI
Language英语
Funding ProjectShenyang National Laboratory for Materials Science[E01SL102] ; US National Science Foundation[DMR-2002860] ; NASA[80MSFC19C0050]
WOS Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000670106400003
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/159923
Collection中国科学院金属研究所
Corresponding AuthorSchuh, C. A.; Li, Y.
Affiliation1.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang, Peoples R China
2.MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 USA
Recommended Citation
GB/T 7714
Duan, F. H.,Naunheim, Y.,Schuh, C. A.,et al. Breakdown of the Hall-Petch relationship in extremely fine nanograined body-centered cubic Mo alloys[J]. ACTA MATERIALIA,2021,213:9.
APA Duan, F. H.,Naunheim, Y.,Schuh, C. A.,&Li, Y..(2021).Breakdown of the Hall-Petch relationship in extremely fine nanograined body-centered cubic Mo alloys.ACTA MATERIALIA,213,9.
MLA Duan, F. H.,et al."Breakdown of the Hall-Petch relationship in extremely fine nanograined body-centered cubic Mo alloys".ACTA MATERIALIA 213(2021):9.
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