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Effect of Structural Relaxation on the Indentation Size Effect and Deformation Behavior of Cu–Zr–Based Nanoglasses

Sharma, A.; Nandam, Sree Harsha 1; Hahn, Horst; Prasad, K. Eswar
1 Institut für Nanotechnologie (INT), Karlsruher Institut für Technologie (KIT)

Abstract:

In this work, the deformation behavior of as-prepared (AP) and structurally relaxed (SR) Cu–Zr–based nanoglasses (NGs) are investigated using nano- and micro-indentation. The NGs are subjected to structural relaxation by annealing them close to the glass transition temperature without altering their amorphous nature. The indentation load, p, vs. displacement, h, curves of SR samples are characterized by discrete displacement bursts, while the AP samples do not show any of them, suggesting that annealing has caused a local change in the amorphous structure. In both the samples, hardness (at nano- and micro-indentation) decreases with increasing p, demonstrating the indentation size effect. The micro-indentation imprints of SR NGs show evidence of shear bands at the periphery, indicating a heterogeneous plastic flow, while AP NG does not display any shear bands. Interestingly, the shear band density decreases with p, highlighting the fact that plastic strain is accommodated entirely by the shear bands in the subsurface deformation zone. The results are explained by the differences in the amorphous structure of the two NGs.


Verlagsausgabe §
DOI: 10.5445/IR/1000137356
Veröffentlicht am 30.06.2022
Originalveröffentlichung
DOI: 10.3389/fmats.2021.676764
Scopus
Zitationen: 6
Web of Science
Zitationen: 6
Dimensions
Zitationen: 6
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Nanotechnologie (INT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 2296-8016
KITopen-ID: 1000137356
HGF-Programm 43.31.01 (POF IV, LK 01) Multifunctionality Molecular Design & Material Architecture
Erschienen in Frontiers in Materials
Verlag Frontiers Media SA
Band 8
Seiten Art. Nr.: 676764
Vorab online veröffentlicht am 17.06.2021
Schlagwörter nanoglass, amorphous, indentation size effect, micro-indentation, structural relaxation, plastic deformation, nano-indentation
Nachgewiesen in Dimensions
Scopus
Web of Science
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