Dislocation nucleation facilitated by atomic segregation
Abstract
Surface segregation—the enrichment of one element at the surface, relative to the bulk—is ubiquitous to multi-component materials. Using the example of a Cu–Au solid solution, we demonstrate that compositional variations induced by surface segregation are accompanied by misfit strain and the formation of dislocations in the subsurface region via a surface di˙usion and trapping process. The resulting chemically ordered surface regions acts as an e˙ective barrier that inhibits subsequent dislocation annihilation at free surfaces. Using dynamic, atomic-scale resolution electron microscopy observations and theory modelling, we show that the dislocations are highly active, and we delineate the specific atomic-scale mechanisms associated with their nucleation, glide, climb, and annihilation at elevated temperatures. As a result, these observations provide mechanistic detail of how dislocations nucleate and migrate at heterointerfaces in dissimilar-material systems.
- Authors:
-
[3];
[4];
[4];
[1]
- State Univ. of New York at Binghamton, Binghamton, NY (United States)
- Univ. of Michigan, Ann Arbor, MI (United States)
- Univ. of Pittsburgh, Pittsburgh, PA (United States)
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Publication Date:
- Research Org.:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1434777
- Report Number(s):
- BNL-203569-2018-JAAM
Journal ID: ISSN 1476-1122; TRN: US1802822
- Grant/Contract Number:
- SC0012704
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nature Materials
- Additional Journal Information:
- Journal Volume: 17; Journal Issue: 1; Journal ID: ISSN 1476-1122
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Atomistic models; Metals and alloys; Structural properties; Surfaces; interfaces and thin films; Transmission electron microscopy
Citation Formats
Zou, Lianfeng, Yang, Chaoming, Lei, Yinkai, Zakharov, Dmitri, Wiezorek, Jorg M. K., Su, Dong, Yin, Qiyue, Li, Jonathan, Liu, Zhenyu, Stach, Eric A., Yang, Judith C., Qi, Liang, Wang, Guofeng, and Zhou, Guangwen. Dislocation nucleation facilitated by atomic segregation. United States: N. p., 2017.
Web. doi:10.1038/nmat5034.
Zou, Lianfeng, Yang, Chaoming, Lei, Yinkai, Zakharov, Dmitri, Wiezorek, Jorg M. K., Su, Dong, Yin, Qiyue, Li, Jonathan, Liu, Zhenyu, Stach, Eric A., Yang, Judith C., Qi, Liang, Wang, Guofeng, & Zhou, Guangwen. Dislocation nucleation facilitated by atomic segregation. United States. https://doi.org/10.1038/nmat5034
Zou, Lianfeng, Yang, Chaoming, Lei, Yinkai, Zakharov, Dmitri, Wiezorek, Jorg M. K., Su, Dong, Yin, Qiyue, Li, Jonathan, Liu, Zhenyu, Stach, Eric A., Yang, Judith C., Qi, Liang, Wang, Guofeng, and Zhou, Guangwen. Mon .
"Dislocation nucleation facilitated by atomic segregation". United States. https://doi.org/10.1038/nmat5034. https://www.osti.gov/servlets/purl/1434777.
@article{osti_1434777,
title = {Dislocation nucleation facilitated by atomic segregation},
author = {Zou, Lianfeng and Yang, Chaoming and Lei, Yinkai and Zakharov, Dmitri and Wiezorek, Jorg M. K. and Su, Dong and Yin, Qiyue and Li, Jonathan and Liu, Zhenyu and Stach, Eric A. and Yang, Judith C. and Qi, Liang and Wang, Guofeng and Zhou, Guangwen},
abstractNote = {Surface segregation—the enrichment of one element at the surface, relative to the bulk—is ubiquitous to multi-component materials. Using the example of a Cu–Au solid solution, we demonstrate that compositional variations induced by surface segregation are accompanied by misfit strain and the formation of dislocations in the subsurface region via a surface di˙usion and trapping process. The resulting chemically ordered surface regions acts as an e˙ective barrier that inhibits subsequent dislocation annihilation at free surfaces. Using dynamic, atomic-scale resolution electron microscopy observations and theory modelling, we show that the dislocations are highly active, and we delineate the specific atomic-scale mechanisms associated with their nucleation, glide, climb, and annihilation at elevated temperatures. As a result, these observations provide mechanistic detail of how dislocations nucleate and migrate at heterointerfaces in dissimilar-material systems.},
doi = {10.1038/nmat5034},
journal = {Nature Materials},
number = 1,
volume = 17,
place = {United States},
year = {Mon Nov 27 00:00:00 EST 2017},
month = {Mon Nov 27 00:00:00 EST 2017}
}
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