Early microstructural evolution and deformation behavior in solution-heat-treated aluminum-lithium alloys
The binary aluminum-lithium system is age-hardened by the metastable phase [delta][prime] (Al[sub 3]Li). The [delta][prime] precipitates are present in volume fractions of [approximately] 0.2 in commercial Al-Li based alloys and thus affect many of the mechanical properties. In this investigation, the formation of [delta][prime] during rapid quenching after solution heat treatment is compared with the formation behavior during slower quenching in alloys with commercially important Cu and Mg additions. The alloys used were in wt.% Al-2.4% Li-0.11Zr, Al-2.45Li-3.15Cu-0.12Zr, and Al-2.6Li-1Cu-0.5Mg-0.5Zr. The formation of the microstructures in the different alloys during both rapid and slow quench rates, and the effects of the microstructural features on the tensile deformation behavior were studied. The microstructure produced by slow air cooling displayed higher tensile elongation and strength as compared with the microstructure produced by rapid water quenching.
- Research Organization:
- California Univ., Berkeley, CA (United States)
- OSTI ID:
- 6929653
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360102* -- Metals & Alloys-- Structure & Phase Studies
360103 -- Metals & Alloys-- Mechanical Properties
ALLOYS
ALUMINIUM ALLOYS
COPPER ALLOYS
CRYSTAL STRUCTURE
DEFORMATION
HEAT TREATMENTS
LITHIUM ALLOYS
MAGNESIUM ADDITIONS
MAGNESIUM ALLOYS
MECHANICAL PROPERTIES
MICROSTRUCTURE
ZIRCONIUM ADDITIONS
ZIRCONIUM ALLOYS