A comparative study of nanovoid growth in FCC metals

Abstract

Previous HotQC studies of Cu nanovoids undergoing volumetric expansion conducted by the authors have uncovered a quasistatic-to-dynamic transition at a critical strain rate of the order of . At low strain rates nanovoid expansion takes place under essentially isothermal conditions, whereas at high strain rates it happens under essential adiabatic conditions. In this paper, we present a comparative study concerned with two different scenarios, each representing a variation on the reference case presented in [1]: (i) aluminium (Al) nanovoids undergoing volumetric expansion; and (ii) copper (Cu) nanovoids undergoing uniaxial deformation. Scenario (i) addresses material specificity by replacing Cu by Al in the reference case, whereas scenario (ii) addresses the effect of triaxiality by replacing volumetric expansion by uniaxial expansion in the reference case. We find a distinct quasistatic-to-dynamic transition in both scenarios, which suggests that the transition is indeed universal, i.e. material and strain-triaxiality independent. By contrast, the fine structure of the dislocation mechanisms that mediate void growth are strongly material and loading specific.

Keywords:

• Non-equilibrium statistical thermodynamics
• thermo-mechanical coupling
• nanovoids
• finite temperature

Notes

No potential conflict of interest was reported by the authors.

Additional information

Funding

We gratefully acknowledge the support of the Ministerio de Economía y Competitividad of Spain [grant number DPI2012-32508], [grant number DPI2015-66534-R], from the Natural Sciences and Engineering Research Council of Canada (NSERC) through the Discovery Grant [Award Application Number RGPIN-2016-06114], and from the U. S. Army Research Laboratory (ARL) through the Materials in Extreme Dynamic Environments (MEDE) Collaborative Research Alliance (CRA) [Award Number W911NF-11-R-0001].