A study has been made of the role of microstructure in room-temperature tensile properties as well as elevated-temperature creep behavior of an advanced Ti3Al-base alloy, Ti-25Al-10Nb-3V-1Mo (atomic percent). Creep studies have been performed on this alloy as a function of stress and temperature between 650C and 870C. A pronounced influence of microstructure on creep resistance was found. Generally, the beta solution-treated colony-type (slow-cooled or SC) microstructure showed superior creep resistance. Study of the stress dependence of steady-state creep rate indicates that increasing temperature caused a gradual decrease in the stress exponent n and a transition in creep mechanism at 870C, depending on applied stress level. Transmission electron microscopy (TEM) observations of deformed dislocation structures developed during steady-state creep and room-temperature tensile tests, as well as the corresponding fracture modes, were used to interpret properties as a function of temperature. Finally, creep behavior of the present Ti3Al alloy was found to be superior to that of conventional near-alpha titanium alloys.
Creep behavior of Ti-25Al-10Nb-3V-1Mo
Kriechverhalten von Ti-25Al-10Nb-3V-1Mo
Metallurgical Transactions A, Physical Metallurgy and Materials Science ; 21A , 3 ; 641-651
1990
11 Seiten, 18 Bilder, 28 Quellen
Aufsatz (Zeitschrift)
Englisch
KRIECHVERFORMUNG , MIKROGEFUEGE , VERFORMUNGSBRUCH , HOCHTEMPERATURVERHALTEN , HOCHTEMPERATURWERKSTOFF , KRIECHEN (WERKSTOFF) , KRIECHFESTIGKEIT , KRIECHKURVE , KUEHLUNG , ZUGEIGENSCHAFT , ZUGFESTIGKEIT , TEMPERATUREINFLUSS , VERSETZUNGSSTRUKTUR , BETA-PHASE , VERSETZUNGSBEWEGUNG , LUFTFAHRTINDUSTRIE
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