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Download e-book for iPad: Encyclopedia of materials, parts, and finishes [...] XA-GB by Mel M Schwartz

By Mel M Schwartz

ISBN-10: 1566766613

ISBN-13: 9781566766616

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Extra info for Encyclopedia of materials, parts, and finishes [...] XA-GB

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Although NiAl-base composites may provide an alternative avenue to balanced properties, this approach is still in its infancy. Electronic Applications NiAl is an attractive material for metallizations on III–V semiconductors, and is also a critical component in complex “metal”/ III–V semiconductor heterostructures, such as enhancedbarrier Schottky contacts and semiconductorclad metallic quantum wells. The characteristics that make NiAl an attractive candidate include a good lattice parameter match with several semiconductors (for epitaxy), chemical stability, good electrical conductivity, and a stable native oxide that allows patterning in air without destroying electrical continuity.

The understanding of the cause of brittleness in iron aluminides has led to new directions in the design of ductile iron aluminide alloys. The schemes used to improve the ductility of Fe3Al–FeAl alloys include control of surface conditions, reduction of hydrogen solubility and diffusion by alloy additions, refinement of grain structure by thermomechanical treatment, enhancement of grain-boundary cohesion by microalloying, and control of grain shape and recrystallization condition. The ductile Fe3Al alloys show a distinctly high yield strength and a high ductility of 13 to 16% when tested in air at room temperature.

The rules were discovered in a strictly empirical way, and for the most part, the present theoretical understanding of alloys consists of rudimentary theories that describe how the rules arise from the basic principles of physics. These rules were proposed by W. Hume-Rothery concerning the binary substitutional alloys and phase diagrams. ALLYLICS (DIALLYL PHTHALATE PLASTICS) Allylics are thermosetting materials developed since World War II. The most important of these are diallyl phthalate (DAP) and diallyl isophthalate (DAIP), which are currently available in the form of monomers and prepolymers (resins).

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Encyclopedia of materials, parts, and finishes [...] XA-GB by Mel M Schwartz


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