Substitutional solutes in the laves phase intermetalic compounds Cr[sub 2] Zr and Cu[sub 2] M[sub g]; Solution hardening and defect structures
- General Electric Co., Schenectady, NY (United States). Corporate Research and Development Center
This paper reports that hardness and strength can be attained in pure metals by solid-solution hardening. Although the primary mechanisms of solid-solution hardening are though to be known in dilute metal alloys, the mechanisms in intermetallic compounds are not established for most structure types. The mere existence of solution hardening is not well demonstrated. There are, however, data for the B2 compounds AgMg and, recently, AlCo, the L1[sub 2] structure Ni[sub 3]Al, and preliminary results for the C15 cubic Laves phase Cu[sub 2]Mg. The plan here is to examine further the Cu[sub 2]Mg data and present new results for defects, moduli, density, and hardening in a high-temperature C15 compound, Cr[sub 2]Zr (melting temperature 1673[degrees]C). A special feature, and complication, of intermetallics is that off-stoichiometry leas to constitutional defects--substitutions or vacancies that are created by deviations from stoichiometry. Thus, in order to understand hardening, we need to identify the sites of constitutional solutes in off-stoichiometric intermetallics and to quantify the elastic interactions with dislocations of both these solutes and of ternary additions.
- OSTI ID:
- 6918539
- Journal Information:
- Scripta Metallurgica et Materialia; (United States), Vol. 27:7
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
74 ATOMIC AND MOLECULAR PHYSICS
CHROMIUM ALLOYS
CRYSTAL DEFECTS
LAVES PHASES
COPPER ALLOYS
HEAT RESISTANT MATERIALS
AGE HARDENING
EDGE DISLOCATIONS
MANGANESE ALLOYS
ZIRCONIUM ALLOYS
CHEMICAL REACTION KINETICS
HARDNESS
IMPACT STRENGTH
INTERMETALLIC COMPOUNDS
LATTICE PARAMETERS
SHEAR
SOLID SOLUTIONS
STOICHIOMETRY
STRAIN HARDENING
ALLOYS
CRYSTAL STRUCTURE
DISLOCATIONS
DISPERSIONS
HARDENING
KINETICS
LINE DEFECTS
MATERIALS
MECHANICAL PROPERTIES
MIXTURES
REACTION KINETICS
SOLUTIONS
360102* - Metals & Alloys- Structure & Phase Studies
360104 - Metals & Alloys- Physical Properties
664200 - Spectra of Atoms & Molecules & their Interactions with Photons- (1992-)
360103 - Metals & Alloys- Mechanical Properties