Szczegóły publikacji
Opis bibliograficzny
Tensile deformation of fine-grained Mg at 4K, 78K and 298K / M. WALĄG, A. KULA, P. NOGA, T. TOKARSKI, G. CIOS, M. Niewczas // Journal of Magnesium and Alloys [Dokument elektroniczny]. — Czasopismo elektroniczne ; ISSN 2213-9567. — 2024 — vol. 12 iss. 6, s. 2534-2556. — Wymagania systemowe: Adobe Reader. — Bibliogr. s. 2555-2556, Abstr. — Publikacja dostępna online od: 2024-06-27
Autorzy (6)
Słowa kluczowe
Dane bibliometryczne
| ID BaDAP | 154512 |
|---|---|
| Data dodania do BaDAP | 2024-07-18 |
| Tekst źródłowy | URL |
| DOI | 10.1016/j.jma.2024.06.012 |
| Rok publikacji | 2024 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Creative Commons | |
| Czasopismo/seria | Journal of Magnesium and Alloys |
Abstract
The impact of grain size, ranging from 0.9 to 9 , on the mechanical properties of commercially pure Mg is investigated at temperatures of 4K, 78K, and 298K. The mechanisms governing plastic flow are influenced by both grain size and temperature. At 4K and 78K, dominant deformation modes in Mg involve dislocation glide and extension twinning, regardless of grain size. The interactions between basal and non-basal dislocations and dislocations with grain boundaries promote an unusually high rate of work hardening in the plastic regime, leading to premature failure. The yield stress follows the Hall-Petch relationship , with the slope k increasing with decreasing temperature. At 298K, in addition to dislocation glide and twinning, grain boundary sliding (GBS) becomes significant in samples with grain sizes below 3 , considerably enhancing the material’s deformability. GBS activation provides an additional recovery mechanism for dislocations accumulating at grain boundaries, facilitating their absorption during sliding and rotation. Analysis of relationship suggests that the basal slip is the dominant dislocation mode in Mg at 298K. Decreasing grain size suppresses dislocation activity and twinning and increases GBS, resulting in lower and values. Suppressing conventional deformation modes coupled with enhanced GBS yields stress softening, breaking down the Hall-Petch relationship in Mg below 3 grain size, leading to an inverse Hall-Petch behaviour. The work reports new data on the strength, ductility, work hardening and fracture behaviour, and their variations with Mg grain size across different temperature regimes.
