skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: An interface compatibility/equilibrium mechanism for delamination fracture in aluminum–lithium alloys

; ;
Publication Date:
Sponsoring Org.:
OSTI Identifier:
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Engineering Fracture Mechanics
Additional Journal Information:
Journal Volume: 133; Journal Issue: C; Related Information: CHORUS Timestamp: 2017-07-05 09:04:43; Journal ID: ISSN 0013-7944
Country of Publication:
United Kingdom

Citation Formats

Messner, M. C., Beaudoin, A. J., and Dodds, Jr., R. H. An interface compatibility/equilibrium mechanism for delamination fracture in aluminum–lithium alloys. United Kingdom: N. p., 2015. Web. doi:10.1016/j.engfracmech.2014.11.003.
Messner, M. C., Beaudoin, A. J., & Dodds, Jr., R. H. An interface compatibility/equilibrium mechanism for delamination fracture in aluminum–lithium alloys. United Kingdom. doi:10.1016/j.engfracmech.2014.11.003.
Messner, M. C., Beaudoin, A. J., and Dodds, Jr., R. H. 2015. "An interface compatibility/equilibrium mechanism for delamination fracture in aluminum–lithium alloys". United Kingdom. doi:10.1016/j.engfracmech.2014.11.003.
title = {An interface compatibility/equilibrium mechanism for delamination fracture in aluminum–lithium alloys},
author = {Messner, M. C. and Beaudoin, A. J. and Dodds, Jr., R. H.},
abstractNote = {},
doi = {10.1016/j.engfracmech.2014.11.003},
journal = {Engineering Fracture Mechanics},
number = C,
volume = 133,
place = {United Kingdom},
year = 2015,
month = 1

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.engfracmech.2014.11.003

Citation Metrics:
Cited by: 4works
Citation information provided by
Web of Science

Save / Share:
  • The fatigue strength of Al-Li-Cu-Mg-Zr alloys (T6) increases as the test temperature decreases, especially in the long life regime. The fatigue strength is much improved at both room and low temperatures when more zirconium is added. However, the alloy with higher Zr exhibits less-temperatures dependence of the fatigue strength, particularly in the short life regime. Change in fatigue behavior between room and low temperatures are associated with changes is the fracture mode which can be affected significantly by the addition of zirconium.
  • Cryogenic strength-toughness relationships for advanced aluminum-lithium alloys 2090, 8090, 8091 and 2091 are examined as a function of microstructure, plate orientation and wrought-product form (plate vs. sheet), with specific emphasis on the underlying micro-mechanisms associated with crack advance. It is found that, with decrease in temperature from 298 K to 77 and 4 K, strength, tensile elongation and strain-hardening exponent are increased for all alloy chemistries, microstructures and product forms; however, the longitudinal (L-T, T-L) fracture toughness may increase or decrease depending upon the prevailing microscopic mechanism (microvoid coalescence vs transgranular shear) and macroscopic mode (plane strain vs plane stress)more » of fracture. In general, alloy microstructures that exhibit changes in either the fracture mechanism or mode at low temperatures show a decrease in L-T toughness. Conversely, when the fracture mechanism is unchanged between ambient and 4K, observed variations in toughness with temperature are a strong function of the degree of local stress-triaxiality that develops at the crack tip. 55 refs., 18 figs., 2 tabs.« less
  • Stress corrosion cracking (SCC) test specimens of Al-Li-Cu alloy that were subjected to fixed-displacement loading and exposed to aerated 3.5 wt% sodium chloride (NaCl) solution for 1 week failed < 24 h after removal into ambient atmospheres. Anodic dissolution-based mechanisms proposed previously for this phenomenon were amended based upon further characterization of the rapid cracking process. Amendments were based on studies of the relative electrochemical behavior of the microstructural elements in the subgrain boundary (SGB) region, time-to-failure SCC testing in a simulated crack solution, evolution of crack potential and pH with time, fractographic examination of failed samples, and X-ray diffractionmore » (XRD) of films passivating crack walls. Results suggested an active path existed along SGB that was composed of the highly reactive T{sub 1} (Al{sub 2}CuL{sub i}) precipitate phase and a solute-depleted zone that did not passivate readily when exposed to the crack environment. The matrix phase along crack walls appeared to passivate in the crack environment, thereby confining attack to the SGB region. This active path was enabled when cracks were isolated from a bulk environment, but it was disabled otherwise. Potential and pH conditions required for cracking were reviewed, along with the formation of a hydrotalcite, Li{sub 2}[Al{sub 2}(OH){sub 6}]{sub 2} CO{sub 3} {center_dot} 3H{sub 2}O, film that appeared to be responsible for passivating crack walls.« less
  • The effects of welding conditions, composition and solidification substrate have been systematically studied in an effort to determine the nature of nondendritic equiaxed grain formation in Al-Cu-Li welds. The equiaxed zone (EQZ) in these alloys forms preferentially at the fusion boundary of arc welds and may have important implications with respect to both weld cracking susceptibility and structural integrity. Over a wide range of weld heat input, achieved by varying weld travel speed and current during autogenous gas tungsten arc welding, it was not possible to eliminate this zone, although its width and the grain size varied considerably. The solidificationmore » substrate had a profound effect on EQZ formation. The EQZ did not form when solidification occurred from an as-cast weld metal substrate. Under other substrate conditions, including the as-cast/solution heat treated condition, an EQZ was always present. Both lithium and zirconium influence EQZ formation, with zirconium exhibiting a more dominant effect. At low levels of lithium and zirconium (0.5 Li, 0.03 Zr), an EQZ was not observed. A unified heterogeneous nucleation mechanism is proposed to describe EQZ formation in Al-Cu-Li welds.« less
  • From joint meeting of the American Nuclear Society and the Atomic Industrial Forum and Nuclear Energy Exhibition; San Francisco, California, USA (11 Nov 1973). See CONF-731101-.