Interface instabilities of growing hydrides
(2016) 21st European Conference on Fracture, ECF 2016 In Procedia Structural Integrity 2. p.589-596- Abstract
- Formation of metal hydrides is a serious complication that occur when hydride forming metals such as zirconium, niobium, vanadium and magnesium are exposed to long term hydrogen environment. The main concern is that the hydride, as being a brittle material, has very poor fracture mechanical properties. Formation of hydride is associated with transportation of hydrogen along the gradients of increasing hydrostatic stress, which leads to crack tips and other stress concentrators, where it forms the hydride. In the present study the thermodynamics of the evolving hydrides is studied. The process is driven by the release of free strain, chemical, and gradient energies. A phase field model is used to capture the driving forces that the release... (More)
- Formation of metal hydrides is a serious complication that occur when hydride forming metals such as zirconium, niobium, vanadium and magnesium are exposed to long term hydrogen environment. The main concern is that the hydride, as being a brittle material, has very poor fracture mechanical properties. Formation of hydride is associated with transportation of hydrogen along the gradients of increasing hydrostatic stress, which leads to crack tips and other stress concentrators, where it forms the hydride. In the present study the thermodynamics of the evolving hydrides is studied. The process is driven by the release of free strain, chemical, and gradient energies. A phase field model is used to capture the driving forces that the release of the free energy causes. The study gives the conditions that lead to hydride advancement versus retreat and under which conditions the metal-hydride interface becomes unstable and develops a waviness. The spatial frequency spectrum leading to instability is found to depend on the ratio of the elastic strain energy density and parameters related to the interface energy. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/532eb929-a50f-49c0-863b-735cfc2f570c
- author
- Ståhle, Per LU and Reheman, Wureguli LU
- organization
- publishing date
- 2016-12-31
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Interface, instability, hydrides, Precipitate growth
- in
- Procedia Structural Integrity
- volume
- 2
- pages
- 7 pages
- publisher
- Elsevier
- conference name
- 21st European Conference on Fracture, ECF 2016
- conference location
- Catania, Italy
- conference dates
- 2016-06-20 - 2016-06-24
- external identifiers
-
- scopus:85055972017
- ISSN
- 2452-3216
- DOI
- 10.1016/j.prostr.2016.06.076
- language
- Swedish
- LU publication?
- yes
- id
- 532eb929-a50f-49c0-863b-735cfc2f570c
- date added to LUP
- 2019-06-04 10:14:48
- date last changed
- 2024-04-16 09:58:59
@article{532eb929-a50f-49c0-863b-735cfc2f570c,
abstract = {{Formation of metal hydrides is a serious complication that occur when hydride forming metals such as zirconium, niobium, vanadium and magnesium are exposed to long term hydrogen environment. The main concern is that the hydride, as being a brittle material, has very poor fracture mechanical properties. Formation of hydride is associated with transportation of hydrogen along the gradients of increasing hydrostatic stress, which leads to crack tips and other stress concentrators, where it forms the hydride. In the present study the thermodynamics of the evolving hydrides is studied. The process is driven by the release of free strain, chemical, and gradient energies. A phase field model is used to capture the driving forces that the release of the free energy causes. The study gives the conditions that lead to hydride advancement versus retreat and under which conditions the metal-hydride interface becomes unstable and develops a waviness. The spatial frequency spectrum leading to instability is found to depend on the ratio of the elastic strain energy density and parameters related to the interface energy.}},
author = {{Ståhle, Per and Reheman, Wureguli}},
issn = {{2452-3216}},
keywords = {{Interface; instability; hydrides; Precipitate growth}},
language = {{swe}},
month = {{12}},
pages = {{589--596}},
publisher = {{Elsevier}},
series = {{Procedia Structural Integrity}},
title = {{Interface instabilities of growing hydrides}},
url = {{http://dx.doi.org/10.1016/j.prostr.2016.06.076}},
doi = {{10.1016/j.prostr.2016.06.076}},
volume = {{2}},
year = {{2016}},
}