Dislocation nucleation facilitated by atomic segregation

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

doi:10.1038/nmat5034

Title: Dislocation nucleation facilitated by atomic segregation

Journal Article · 26 November 2017 · Nature Materials

DOI: https://doi.org/10.1038/nmat5034 · OSTI ID:1434777

Zou, Lianfeng ^[1]; Yang, Chaoming ^[2];

^[3]; Zakharov, Dmitri ^[4]; Wiezorek, Jorg M. K. ^[3];

^[4]; Yin, Qiyue ^[1]; Li, Jonathan ^[1]; Liu, Zhenyu ^[3];

^[4]; Yang, Judith C. ^[3]; Qi, Liang ^[2]; Wang, Guofeng ^[3];

^[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)

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.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: SC0012704

OSTI ID:: 1434777

Report Number(s):: BNL--203569-2018-JAAM

Journal Information:: Nature Materials, Journal Name: Nature Materials Journal Issue: 1 Vol. 17; ISSN 1476-1122

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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