Annealing dynamics of interstitial complexes in a dilute Al-Li alloy with Fe

Journal Article · Sun May 01 04:00:00 EDT 1994 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.49.11634· OSTI ID:5092599

Igarashi, B ^[1]; Johnson, E C ^[2]; Granato, A V ^[1]

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1. Physics Department and Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801 (United States)
2. The Aerospace Corporation, M2/248, P.O. Box 92957, Los Angeles, California 90009 (United States)

Previous ultrasonic measurements of a dilute Al-Li alloy irradiated by 2.3-MeV electrons gave strong evidence that self-interstitial atoms trapped by Li atoms form mixed dumbbells with tetragonal symmetry. The dumbbell is detected through its relaxation, which anneals away by 130 K. In this work, Fe is added to the alloy to determine whether this annealing stage represents migration of the defect to a trap or its dissociation. Fe atoms are known to trap self-interstitials, forming a complex stable to stage III that gives a set of relaxations different from the Al-Li relaxation. If Al-Li complexes dissociate, then self-interstitials would be released and captured by Fe atoms, resulting in larger Al-Fe relaxations. This result is not seen for this annealing stage. Furthermore, it is unlikely that the annealing is due to a change of configuration of the defect, since the anisotropy of the diaelastic effect remains constant during the annealing. Therefore, the Al-Li complex migrates as a unit without dissociating during this annealing stage. However, Al-Li complexes are observed to dissociate at 200 K, or about 20 K below stage III.

• DOE Contract Number: AC02-76ER01198; FG02-91ER45439
• OSTI ID: 5092599
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 49:17; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103 -- Metals & Alloys-- Mechanical Properties
360106* -- Metals & Alloys-- Radiation Effects
ALLOYS
ALUMINIUM ALLOYS
ALUMINIUM COMPLEXES
ANNEALING
BEAMS
COMPLEXES
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DIMENSIONS
DISSOCIATION
DYNAMICS
ELECTRON BEAMS
ENERGY RANGE
HEAT TREATMENTS
INTERSTITIALS
IRON ADDITIONS
IRON ALLOYS
IRON COMPLEXES
LENGTH
LEPTON BEAMS
LITHIUM ALLOYS
LITHIUM COMPLEXES
MECHANICS
MEV RANGE
MEV RANGE 01-10
MIGRATION LENGTH
PARTICLE BEAMS
POINT DEFECTS
RADIATION EFFECTS
RELAXATION
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE
TEMPERATURE RANGE 0000-0013 K
TEMPERATURE RANGE 0013-0065 K
TEMPERATURE RANGE 0065-0273 K
TRANSITION ELEMENT COMPLEXES
TRAPPING