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Title: Helium irradiation induced ultra-high strength nanotwinned Cu with nanovoids

Journal Article · · Acta Materialia

There are mounting studies that show nanotwinned (NT) metals have enhanced radiation tolerance. Yet, the mechanical deformability of irradiated nanotwinned metals is a largely under explored subject. Here we look at the mechanical properties of He ion irradiated nanotwinned Cu with preexisting nanovoids. In comparison with coarse-grained Cu, nanovoid nanotwinned (NV-NT) Cu exhibits prominently improved radiation tolerance. Moroever, in situ micropillar compression tests show that the irradiated NV-NT Cu has an ultrahigh yield strength of ~1.6 GPa with significant plasticity. Post radiation analyses show that twin boundaries are decorated with He bubbles and thick stacking faults. These stacking fault modified twin boundaries introduce significant strengthening in NT Cu. This study provides further insight into the design of high-strength, advanced radiation tolerant nanostructured materials for nuclear reactor applications.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC). Basic Energy Sciences (BES) (SC-22); USDOE National Nuclear Security Administration (NNSA); U.S. Office of Naval Research
Grant/Contract Number:
89233218CNA000001
OSTI ID:
1542859
Report Number(s):
LA-UR-19-26253
Journal Information:
Acta Materialia, Vol. 177; ISSN 1359-6454
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 26 works
Citation information provided by
Web of Science

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Cited By (2)

Hierarchical nanotwins in single-crystal-like nickel with high strength and corrosion resistance produced via a hybrid technique journal January 2020
Dual Beam In Situ Radiation Studies of Nanocrystalline Cu journal August 2019

Figures / Tables (12)


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