Decoding the interstitial/vacancy nature of dislocation loops with their morphological fingerprints in face-centered cubic structure

Ma, Kan; Guo, Long; Dartois, Antoine; Meslin, Estelle; Ophus, Colin; Décamps, Brigitte; Fraczkiewicz, Anna; Knowles, Alexander J.; Wang, Lumin; Tissot, Olivier; Prima, Frédéric; Gao, Fei; Deng, Huiqiu; Loyer-Prost, Marie

doi:10.1126/sciadv.adq4070

Decoding the interstitial/vacancy nature of dislocation loops with their morphological fingerprints in face-centered cubic structure

Journal Article · Fri Apr 11 00:00:00 EDT 2025 · Science Advances

DOI:https://doi.org/10.1126/sciadv.adq4070· OSTI ID:2570728

^[1]; ^[2]; ^[3]; ^[3]; ^[4]; ^[5]; Fraczkiewicz, Anna ^[6]; ^[7]; ^[8]; ^[3]; Prima, Frédéric ^[9]; ^[8]; ^[2]; ^[3]

City Univ. of Hong Kong, Kowloon (Hong Kong); Univ. Paris-Saclay, Gif-sur-Yvette (France); Commissariat a l'Energie Atomique et aux Energies Alternatives (CEA-Saclay), Gif-sur-Yvette (France); Univ. of Birmingham (United Kingdom)
Hunan Univ., Changsha (China)
Univ. Paris-Saclay, Gif-sur-Yvette (France); Commissariat a l'Energie Atomique et aux Energies Alternatives (CEA-Saclay), Gif-sur-Yvette (France)
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Stanford Univ., CA (United States)
Univ. Paris-Saclay, Orsay (France); Centre National de la Recherche Scientifique (CNRS), Orsay (France). Inst. National de Physique Nucleaire et de Physique des Particules (IN2P3), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab)
Ecole Nationale Supérieure des Mines de Saint Etienne (EMSE) (France); Centre Sciences des Matériaux et des Structures (SMS), Saint-Étienne (France)
Univ. of Birmingham (United Kingdom)
Univ. of Michigan, Ann Arbor, MI (United States)
PSL Research University, Paris (France); Chimie ParisTech-CNRS (France). Institut de Recherche de Chimie Paris

Dislocation loops are critical defects inducing detrimental effects like embrittlement and swelling in materials under irradiation. Distinguishing their nature (interstitial- or vacancy-type) is a long-standing challenge with great implications for understanding radiation damage. Here, we demonstrate that the morphology of radiation-induced Frank loops can unveil their nature in face-centered cubic (fcc) structure: Circular loops are interstitial-type in all fcc materials, while segmented loops are vacancy-type in high stacking fault energy (SFE) alloys but varied-type in low SFE and high-entropy alloys. The polygonal shape is attributed to the dissociation of an a₀/3<111> dislocation into an a₀/6<112> Shockley partial and an a₀/6<110> stair-rod dislocation. The dissociation of vacancy loops is energetically favorable, whereas interstitial loops require external stimuli to promote dislocation propagation. This “morphology-nature” correlation not only highlights the asymmetry of vacancy/interstitial loops but also offers an efficient way to distinguish loop nature for a wide range of materials.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB); UK Research and Innovation (UKRI); Royal Academy of Engineering (RAEng)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 2570728

Journal Information:: Science Advances, Journal Name: Science Advances Journal Issue: 15 Vol. 11; ISSN 2375-2548

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: English

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