Improving intermetallic ductility and toughness
The intermetallic compound Ni/sub 3/Al has reasonable high-temperature strength, a high elastic modulus and is strongly resistant to oxidation and corrosion. Another intermetallic Mg/sub 17/Al/sub 12/, has both high strength and a low density. However, in common with many intermetallics, these two compounds in polycrystal-line form are brittle at ambient temperature, rendering them inappropriate for many structural applications. Factors which may lead to the brittle failure of intermetallics include a limited number of easy slip systems, a large slip vector, restricted cross-slip and difficulty of transmitting slip across grain boundaries. These considerations are intrinsic to the often complex crystal structures and are simultaneously the source of their strength. Thus, it would be undesirable to disorder an ordered alloy to improve the ductility if, in so doing, the alloy's strength was also greatly diminished. The various techniques to improve ductility or toughness can be loosely-placed in four categories: microalloying, macroalloying, microstructural control through processing and fiber strengthening/toughening.
- Research Organization:
- Dept. of Metallurgy and Science of Materials at the Univ. of Oxford (GB)
- OSTI ID:
- 5002113
- Journal Information:
- J. Met.; (United States), Journal Name: J. Met.; (United States) Vol. 40:2; ISSN JOMTA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360102 -- Metals & Alloys-- Structure & Phase Studies
360103* -- Metals & Alloys-- Mechanical Properties
360105 -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
ALUMINIUM ALLOYS
BRITTLENESS
CHEMICAL REACTIONS
CORROSION
CRYSTAL STRUCTURE
CRYSTALS
DUCTILITY
ELASTICITY
GRAIN BOUNDARIES
HIGH TEMPERATURE
INTERMETALLIC COMPOUNDS
MAGNESIUM ALLOYS
MECHANICAL PROPERTIES
MICROSTRUCTURE
NICKEL ALLOYS
OXIDATION
PROCESSING
TENSILE PROPERTIES