Nanotwin assisted reversible formation of low angle grain boundary upon reciprocating shear load
Abstract
Severe plastic deformation of metals is known to lead to superior properties that cannot be achieved by any traditional metallurgic process. Origin of the superior properties is perceived to be closely associated with grain refinement, a fundamental process during the severe plastic deformation, which is essentially the formation of new grain boundaries. However, the atomistic mechanism of grain boundary formation remains largely obscure. Here, by using in-situ transmission electron microscopy and molecular dynamic simulation, we reveal, for the first time at atomic level, the shear-induced low-angle grain boundary (LAGB) formation processes in Au nanocrystal. In this work, we discover the LAGB formation is accomplished through inward propagation of nanotwins accompanied by dislocations gliding on the twin boundaries, a nanotwin-mediated dislocation slip mechanism, which shows reversible characteristic under reciprocating shear load and is affected by the nanocrystal microstructure and orientation. Our result unveils unprecedented atomistic insights on shear driven grain refinement towards nanostructure of superior properties.
- Authors:
-
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab. (EMSL)
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Colorado School of Mines, Golden, CO (United States)
- Publication Date:
- Research Org.:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab. (EMSL)
- Sponsoring Org.:
- USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC), Biological and Environmental Research (BER)
- OSTI Identifier:
- 1922047
- Alternate Identifier(s):
- OSTI ID: 1960898
- Report Number(s):
- PNNL-SA-167698
Journal ID: ISSN 1359-6454
- Grant/Contract Number:
- AC05-76RL01830
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Acta Materialia
- Additional Journal Information:
- Journal Volume: 230; Journal ID: ISSN 1359-6454
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Li, Shuang, Chen, Nanjun, Rohatgi, Aashish, Li, Yulan, Powell, Cynthia A., Mathaudhu, Suveen, Devaraj, Arun, Hu, Shenyang, and Wang, Chongmin. Nanotwin assisted reversible formation of low angle grain boundary upon reciprocating shear load. United States: N. p., 2022.
Web. doi:10.1016/j.actamat.2022.117850.
Li, Shuang, Chen, Nanjun, Rohatgi, Aashish, Li, Yulan, Powell, Cynthia A., Mathaudhu, Suveen, Devaraj, Arun, Hu, Shenyang, & Wang, Chongmin. Nanotwin assisted reversible formation of low angle grain boundary upon reciprocating shear load. United States. https://doi.org/10.1016/j.actamat.2022.117850
Li, Shuang, Chen, Nanjun, Rohatgi, Aashish, Li, Yulan, Powell, Cynthia A., Mathaudhu, Suveen, Devaraj, Arun, Hu, Shenyang, and Wang, Chongmin. Wed .
"Nanotwin assisted reversible formation of low angle grain boundary upon reciprocating shear load". United States. https://doi.org/10.1016/j.actamat.2022.117850. https://www.osti.gov/servlets/purl/1922047.
@article{osti_1922047,
title = {Nanotwin assisted reversible formation of low angle grain boundary upon reciprocating shear load},
author = {Li, Shuang and Chen, Nanjun and Rohatgi, Aashish and Li, Yulan and Powell, Cynthia A. and Mathaudhu, Suveen and Devaraj, Arun and Hu, Shenyang and Wang, Chongmin},
abstractNote = {Severe plastic deformation of metals is known to lead to superior properties that cannot be achieved by any traditional metallurgic process. Origin of the superior properties is perceived to be closely associated with grain refinement, a fundamental process during the severe plastic deformation, which is essentially the formation of new grain boundaries. However, the atomistic mechanism of grain boundary formation remains largely obscure. Here, by using in-situ transmission electron microscopy and molecular dynamic simulation, we reveal, for the first time at atomic level, the shear-induced low-angle grain boundary (LAGB) formation processes in Au nanocrystal. In this work, we discover the LAGB formation is accomplished through inward propagation of nanotwins accompanied by dislocations gliding on the twin boundaries, a nanotwin-mediated dislocation slip mechanism, which shows reversible characteristic under reciprocating shear load and is affected by the nanocrystal microstructure and orientation. Our result unveils unprecedented atomistic insights on shear driven grain refinement towards nanostructure of superior properties.},
doi = {10.1016/j.actamat.2022.117850},
journal = {Acta Materialia},
number = ,
volume = 230,
place = {United States},
year = {Wed Mar 16 00:00:00 EDT 2022},
month = {Wed Mar 16 00:00:00 EDT 2022}
}
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