Deformation and Fracture of L12 Trialuminides

We review here recent experimental and theoretical work aimed at characterizing and understanding the deformation and fracture behavior of L12 trialuminides, with emphasis mainly on Al3Ti-base alloys. We also review recent work on the binary compound Al3Sc, which is a model L12 trialuminide that is...

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Bibliographic Details
Published in:ISIJ International 1991/10/15, Vol.31(10), pp.1063-1075
Main Authors: George, E. P., Pope, D. P., Fu, C. L., Schneibel, J. H.
Format: Article
Language:English
Subjects:
Al3Sc
Al3Ti-base and Al3Zr-base alloys
dislocation structures
first-principles calculations
ideal cleavage strengths and surface energies
L12 trialuminides
mechanical properties and fracture behavior
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Summary:We review here recent experimental and theoretical work aimed at characterizing and understanding the deformation and fracture behavior of L12 trialuminides, with emphasis mainly on Al3Ti-base alloys. We also review recent work on the binary compound Al3Sc, which is a model L12 trialuminide that is being studied for comparison with first-principles quantum mechanical calculations. The topics covered in this review include: alloy-element effects and phase stability; dislocation structures; mechanical properties; cleavage fracture behavior; and first-principles calculations of elastic constants, fault energies, and ideal cleavage strengths. We discuss various possible reasons for the brittleness of these alloys, and summarize our current understanding of the rather unusual phenomenon of brittle cleavage in relatively soft materials having the high-symmetry L12 structure.
ISSN:0915-1559
1347-5460
DOI:10.2355/isijinternational.31.1063