One of the major attractions of the mechanical alloying (MA) process is the ability to make alloys, via solid state processing, from normally incompatible components. The process flexibility extends beyond conventional alloys to include immiscible liquids, metastable phases, amorphous materials, incongruent melting intermetallics, cermets and organic-ceramic-metallic material systems in general. The present paper will focus on our studies of selected intermetallic systems produced by mechanical alloying. There is considerable interest in the development of intermetallic systems such as aluminides for, inter alia, improved density-compensated strength properties, oxidation resistance and low strategic element content. In nickel-base alloys, work on oxide dispersion strengthened MA superalloys containing very high volume fractions of Ni3Al phase has also encompasssed investigation of single phase stoichiometric Ni3Al intermetallic-based compositions. While Ni3Al phase alloys are interesting and may well find some industrial and aerospace applications, the much higher temperature capability of NiAl and Nb3Al systems is more attractive for gas turbine aerospace applications. Titanium-based aluminides such as Ti3Al and TiAl also have properties which make them desirable candidates for aerospace gas turbine engines. These intermetallics are lighter and more oxidation resistant than conventional titanium alloys. Similarly, aluminum based intermetallics such as Al3Ti systems offer weight savings over conventional titanium alloys and strength gains over conventional high temperature aluminum alloys.
Intermetallic systems produced by mechanical alloying
Intermetallische Systeme, hergestellt durch mechanisches Legieren
1988
15 Seiten, 6 Bilder, 2 Tabellen, 41 Quellen
Aufsatz (Konferenz)
Englisch
DISPERSIONSGEHAERTETES METALL , OXIDATIONSGESCHWINDIGKEIT , DISPERSIONSHAERTEN , VERFORMUNGSFAEHIGKEIT , KORNGROESSE , ROENTGENBEUGUNG , DIFFERENZIALRASTERKALORIMETRIE , MECHANISCHES LEGIEREN , ALUMINID , INTERMETALLISCHE VERBINDUNG , RAUMFAHRTINDUSTRIE , GASTURBINE , KRISTALLSTRUKTUR , TEMPERATUREINFLUSS , DICHTE (MASSE) , STRECKGRENZE
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