| Autor: |
Edalati, Kaveh, Wang, Qing, Enikeev, Nariman A., Peters, Laura-Jean, Zehetbauer, Michael J., Schafler, Erhard |
| Rok vydání: |
2023 |
| Předmět: |
|
| Zdroj: |
Materials Science and Engineering A, Vol. 859, p. 144231, 2022 |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1016/j.msea.2022.144231 |
| Popis: |
The microstructure and mechanical properties of materials saturate to steady states after severe plastic deformation (SPD). Despite the well-known effect of temperature on the steady-state microstructure, there is no general agreement on the significance of strain rate and the applicability of the Zener-Hollomon parameter in this regard. In this study, several pure metals (aluminum, copper, titanium, and iron) and a Cu-30Zn (wt%) brass alloy have been processed by a high-speed high-pressure torsion (HPT) equipment with controllable rotation speeds in the range of 0.06 to 60 rpm. It is found that crystallite/grain size, dislocation density, microhardness and shear stress at the steady state are reasonably rate-independent for the von Mises strain rates in the range of 0.004 to 20 s-1. Because both rates of grain refinement and of dynamic recrystallization are proportional to the strain rate, it is suggested that their balance, which determines the steady state, is rate-independent. |
| Databáze: |
arXiv |
| Externí odkaz: |
|
