Szczegóły publikacji
Opis bibliograficzny
Comparative analysis of plastic deformation in Zr-Cu-Ag metallic glasses across macro and micro scales: insights from micropillar and bulk sample compression tests of fully and partially amorphous alloy / Krzysztof PAJOR, Manish Jain, Tomasz KOZIEŁ, Denis PIKULSKI, Piotr BAŁA, Johann Michler, Krzysztof Wieczerzak // Journal of Alloys and Compounds ; ISSN 0925-8388. — 2025 — vol. 1031 art. no. 181053, s. 1-9. — Bibliogr. s. 8-9, Abstr. — Publikacja dostępna online od: 2025-05-19. — P. Bała - dod. afiliacja: ACMiN AGH
Autorzy (7)
- AGHPajor Krzysztof
- Jain Manish
- AGHKozieł Tomasz
- AGHPikulski Denis Alexander
- AGHBała Piotr
- Michler Johann
- Wieczerzak Krzysztof
Słowa kluczowe
Dane bibliometryczne
| ID BaDAP | 160030 |
|---|---|
| Data dodania do BaDAP | 2025-06-17 |
| Tekst źródłowy | URL |
| DOI | 10.1016/j.jallcom.2025.181053 |
| Rok publikacji | 2025 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Creative Commons | |
| Czasopismo/seria | Journal of Alloys and Compounds |
Abstract
This study compared the mechanical behaviour of fully amorphous Zr50Cu37Ag13 and partially amorphous Zr42Cu40Ag18 alloys at both micro- and macroscales using micropillar and bulk compression tests. Both alloys were synthesised via arc melting and tested at strain rates ranging from 10⁻⁴ to 10⁻¹ s⁻¹ . Micropillar tests revealed significant plastic deformation accompanied by serrated flow, with yield strengths ranging from 1468 to 1590 MPa for Zr50Cu37Ag13 and from 1512 to 1758 MPa for Zr42Cu40Ag18. In contrast, bulk tests exhibited limited plasticity. The Zr42Cu40Ag18 alloy fractured in a brittle manner, attributed to the presence of the crystalline Zr₂Ag phase. Negative strain rate sensitivity (SRS) was observed in all micropillar tests and in the bulk Zr50Cu37Ag13 samples, whereas the Zr42Cu40Ag18 bulk samples displayed positive SRS. Analysis of serrated flow in the micropillars revealed pronounced stress drops (Δσ), which increased with decreasing strain rate, indicating active shear band formation and propagation. The negative SRS was attributed to adiabatic shear banding, whereby localised heat generation at high strain rates softened the material and facilitated shear band formation. In contrast, the positive SRS observed in Zr42Cu40Ag18 bulk samples was likely a result of the Zr₂Ag phase, which reduced deformation localisation, promoted a more uniform stress distribution, and activated additional plasticity mechanisms. The smaller stress drops observed in bulk samples stemmed from more dispersed deformation and improved heat dissipation, in contrast to the highly localised deformation seen in micropillars. Fractographic analysis revealed vein-like patterns in Zr50Cu37Ag13 and mixed features in Zr42Cu40Ag18, highlighting the influence of sample size and composition on mechanical behaviour.
