Fatigue crack propagation in an IM and an MA Al-Li-Mg alloy. [Ingot Metallurgy and Mechanical Alloying]
- Univ. of Virginia, Charlottesville (USA)
Two Al-Li-Mg alloys, one manufactured by conventional ingot metallurgy (IM), and the other one by mechanical alloying (MA), have been investigated with respect to their tensile properties and FCP behavior in air and vacuum at room temperature. The age-hardened IM alloy derives its strength mainly from shearable {triangle} particles and a well-developed subgrain structure. Higher strength in the MA material is essentially due to a fine dispersion of small oxide and carbide particles and an ultrafine grain size. Both alloys exhibit homogeneous deformation modes during static and cyclic loading in the utilized heat treatments, i.e., peak-aged (IM) and as-solution heat treated (MA). Crack growth resistance is found to be generally lower for the ingot alloy. The results of the mechanical testing are interpreted in terms of microstructure, texture and crack character.
- OSTI ID:
- 5367314
- Report Number(s):
- CONF-840909--
- Journal Information:
- TMS (The Metallurgical Society) Paper Selection; (USA), Journal Name: TMS (The Metallurgical Society) Paper Selection; (USA) Vol. 56; ISSN 0197-1689; ISSN TMPSA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
ALUMINIUM ALLOYS
CARBIDES
CARBON COMPOUNDS
CHALCOGENIDES
COMPARATIVE EVALUATIONS
CRACK PROPAGATION
CRYSTAL STRUCTURE
DEFORMATION
DISTRIBUTION
FABRICATION
FATIGUE
GRAIN SIZE
HEAT TREATMENTS
LITHIUM ALLOYS
MAGNESIUM ALLOYS
MATERIALS TESTING
MECHANICAL PROPERTIES
MECHANICAL TESTS
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
SIZE
TENSILE PROPERTIES
TESTING
TEXTURE