The process of ductile fracture in metals often begins with void nucleation at second-phase particles and inclusions. Previous studies of rupture in high-purity face-centered-cubic metals, primarily aluminum (Al), concluded that second-phase particles are necessary for cavitation. A recent study of tantalum (Ta), a body-centered-cubic metal, demonstrated that voids nucleate readily at deformation-induced dislocation boundaries. These same features form in Al during plastic deformation. This study investigates why void nucleation was not previously observed at dislocation boundaries in Al. Here, we demonstrate that void nucleation is impeded in Al by room-temperature dynamic recrystallization (DRX), which erases these boundaries before voids can nucleate at them. If dislocation cells reform after DRX and before specimen separation by necking, voids nucleation is observed. These results indicate that dislocation substructures likely plays an important role in ductile rupture.
Noell, Philip J., et al. "Suppression of Void Nucleation in High-Purity Aluminum <em>via</em> Dynamic Recrystallization." Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, vol. 51, no. 1, Oct. 2019. https://doi.org/10.1007/s11661-019-05457-w
Noell, Philip J., Sills, Ryan B., & Boyce, Brad L. (2019). Suppression of Void Nucleation in High-Purity Aluminum <em>via</em> Dynamic Recrystallization. Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, 51(1). https://doi.org/10.1007/s11661-019-05457-w
Noell, Philip J., Sills, Ryan B., and Boyce, Brad L., "Suppression of Void Nucleation in High-Purity Aluminum <em>via</em> Dynamic Recrystallization," Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science 51, no. 1 (2019), https://doi.org/10.1007/s11661-019-05457-w
@article{osti_1765737,
author = {Noell, Philip J. and Sills, Ryan B. and Boyce, Brad L.},
title = {Suppression of Void Nucleation in High-Purity Aluminum <em>via</em> Dynamic Recrystallization},
annote = {The process of ductile fracture in metals often begins with void nucleation at second-phase particles and inclusions. Previous studies of rupture in high-purity face-centered-cubic metals, primarily aluminum (Al), concluded that second-phase particles are necessary for cavitation. A recent study of tantalum (Ta), a body-centered-cubic metal, demonstrated that voids nucleate readily at deformation-induced dislocation boundaries. These same features form in Al during plastic deformation. This study investigates why void nucleation was not previously observed at dislocation boundaries in Al. Here, we demonstrate that void nucleation is impeded in Al by room-temperature dynamic recrystallization (DRX), which erases these boundaries before voids can nucleate at them. If dislocation cells reform after DRX and before specimen separation by necking, voids nucleation is observed. These results indicate that dislocation substructures likely plays an important role in ductile rupture.},
doi = {10.1007/s11661-019-05457-w},
url = {https://www.osti.gov/biblio/1765737},
journal = {Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science},
issn = {ISSN 1073-5623},
number = {1},
volume = {51},
place = {United States},
publisher = {ASM International},
year = {2019},
month = {10}}
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States); Sandia National Laboratories (SNL-CA),
Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
DOE Contract Number:
AC04-94AL85000; NA0003525
OSTI ID:
1765737
Report Number(s):
SAND--2019-5060J; 675273
Journal Information:
Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Journal Name: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science Journal Issue: 1 Vol. 51; ISSN 1073-5623
Philosophical Transactions of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences, Vol. 357, Issue 1756https://doi.org/10.1098/rsta.1999.0384