Transient and intermittent crack growth during embrittlement of 7075-T651 aluminum by mercury

Journal Article · Wed Mar 01 00:00:00 EST 1989 · Scr. Metall.; (United States)

DOI:https://doi.org/10.1016/0036-9748(89)90378-5· OSTI ID:5979649

Liu, Y; Hoagland, R G

This paper presents some results which show intermittent and transient crack growth behavior of a high strength aluminum alloy embrittled by liquid mercury. Run-arrest-run type of cracking behavior resulted in ''n'' and ''m''-shaped curves on the crack velocity (da/dt) vs. stress intensity (K) diagram. While variations in oxygen activity in the crack tip environment may play a role in producing non-unique /nu/-K behavior, the results reported here suggest that formation and rupture of ligaments during crack extension may also be at work in a way that causes the stress intensity associated with the field local to the crack tip (K/sub tip/) to vary stochastically as the crack extends.

• Research Organization: Washington State Univ., Pullman, WA (USA). Dept. of Mechanical Engineering
• OSTI ID: 5979649
• Journal Information: Scr. Metall.; (United States), Vol. 23:3
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM
CRACKING
AQUEOUS SOLUTIONS
CORROSIVE EFFECTS
MERCURY
ATOMS
CHEMICAL REACTION KINETICS
DEFORMATION
ENVIRONMENTAL EFFECTS
HYDROGEN EMBRITTLEMENT
OXYGEN
STOCHASTIC PROCESSES
STRESS CORROSION
CHEMICAL REACTIONS
CORROSION
DECOMPOSITION
DISPERSIONS
ELEMENTS
EMBRITTLEMENT
KINETICS
METALS
MIXTURES
NONMETALS
PYROLYSIS
REACTION KINETICS
SOLUTIONS
THERMOCHEMICAL PROCESSES
360105* - Metals & Alloys- Corrosion & Erosion
360103 - Metals & Alloys- Mechanical Properties