Microstructures of cubic Al sub 2 O sub 3 precipitates in oxygen-implanted aluminum

Conference · Sun Dec 31 23:00:00 EST 1989

OSTI ID:6555303

Follstaedt, D M; Myers, S M; Bourcier, R J

The microstructure of Al ion-implanted at room temperature with 17 at. % 0 has been characterized with TEM. The alloy has extremely small (1.5--3.5 nm) oxide precipitates whose crystal structure is interpreted to be a disordered version of {gamma}-Al{sub 2}O{sub 3} having a fcc lattice of O{sup 2{minus}} ions with Al{sup 3+} ions in random interstitial sites. The small sizes can account for the exceptionally high strength of as-implanted alloys: 2500--3300 MPa. Larger precipitates are found when the alloy is annealed 1/2 hour at 550{degree}C, which is consistent with its somewhat lower strength: 800--1600 MPa. 4 figs.

• Research Organization: Sandia National Labs., Albuquerque, NM (USA)
• Sponsoring Organization: DOE/DP
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 6555303
• Report Number(s): SAND-90-0993C; CONF-900936--7; ON: DE91000038
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
ALUMINIUM
ALUMINIUM ALLOYS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
ANNEALING
CHALCOGENIDES
CRYSTAL STRUCTURE
ELECTRON MICROSCOPY
ELEMENTS
HEAT TREATMENTS
ION IMPLANTATION
METALS
MICROSCOPY
MICROSTRUCTURE
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PRECIPITATION
SEPARATION PROCESSES
TRANSMISSION ELECTRON MICROSCOPY