The role of anodic dissolution in the stress corrosion cracking of Al-Li-Cu alloy 2090
- 1. Sandia National Labs., Albuquerque, NM (United States)
- 2. Virginia Univ., Charlottesville, VA (United States). Center for Electrochemical Sciences and Engineering
- 3. Aluminum Co. of America, Alcoa Center, PA (United States). Alcoa Labs.
Description
The short-transverse (S-T) stress corrosion cracking (SCC) behavior of Al-Li-CU alloy 2090 was studied using a static load SCC test technique. Time to failure was measured as a function of applied potential in several different environments. Rapid SCC failures (< 10 hours) were observed only when the following criteria were satisfied: Ebr,T1 < Eapplied < Ebr,matrix where potentials refer to the breakaway potentials of the subgrain boundary T1 (Al2CuLi) phase and the α-Al matrix phase. Ebr values were measured using potentiodynamic polarization of bulk materials intended to simulate the individual phases found in the subgrain boundary region. Results strongly suggest an anodic dissolution based SCC mechanism for this alloy where selective dissolution of T1 on the subgrain boundary is a critical step. The unusual pre-exposure embrittlement phenomenon demonstrated by Al- Li alloys is also shown to be consistent with these simple SCC criteria. 21 refs., 9 figs., 6 tabs
Availability note (English)
MF available from INIS under the Report Number; OSTI as DE91016403; NTIS; INIS; US Govt. Printing Office Dep.
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Additional details
Publishing Information
- Imprint Pagination
- 15 p.
- Report number
- SAND--91-0840C
Conference
- Title
- 1. symposium on environmental effects of advanced materials.
- Dates
- 19-21 Jun 1991.
- Place
- San Diego, CA (United States).
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 23007017
- Subject category
- S36: MATERIALS SCIENCE;
- Resource subtype / Literary indicator
- Conference
- Descriptors DEI
- ALUMINIUM BASE ALLOYS; ANODES; CHLORINE; CHROMIUM OXIDES; COPPER ALLOYS; CRACK PROPAGATION; CRACKS; DISSOLUTION; EMBRITTLEMENT; GRAIN BOUNDARIES; LITHIUM ALLOYS; PASSIVATION; SCANNING ELECTRON MICROSCOPY; SODIUM CHLORIDES; STRESS CORROSION; TESTING; X-RAY DIFFRACTION
- Descriptors DEC
- ALKALI METAL COMPOUNDS; ALLOYS; ALUMINIUM ALLOYS; CHALCOGENIDES; CHEMICAL REACTIONS; CHLORIDES; CHLORINE COMPOUNDS; CHROMIUM COMPOUNDS; COHERENT SCATTERING; CORROSION; CRYSTAL STRUCTURE; DIFFRACTION; ELECTRODES; ELECTRON MICROSCOPY; ELEMENTS; HALIDES; HALOGEN COMPOUNDS; HALOGENS; MICROSCOPY; MICROSTRUCTURE; NONMETALS; OXIDES; OXYGEN COMPOUNDS; SCATTERING; SODIUM COMPOUNDS; TRANSITION ELEMENT COMPOUNDS
Optional Information
- Contract/Grant/Project number
- Contract AC04-76DP00789
- Funding organization
- USDOE, Washington, DC (United States).
- Secondary number(s)
- CONF-9106145--2.