Some effects of composition and microstructure on the B2{leftrightarrow}DO{sub 3} ordered phase transition in Fe{sub 3}Al alloys

Conference · Thu Dec 31 04:00:00 EST 1992

OSTI ID:10143480

Maziasz, P J; McKamey, C G; Cavin, O B; Hubbard, C R; Zacharia, T

Binary Fe-28 at.% Al alloys (Fe{sub 3}Al-type) transform from B2{yields}DO{sub 3} ordered phases at 550{degrees}C upon cooling. More complex Fe-28Al alloys can have B2{leftrightarrow}DO{sub 3} transition temperatures that range from 530 to 670{degrees}C. Kinetics of the B2{yields}DO{sub 3} ordered phase transition also appear to be affected by alloy composition and by matrix dislocation microstructure. The binary and Nb-containing ternary alloys have rapid B2{yields}DO{sub 3} transition kinetics during cooling. However, the ternary or more complex alloys that contain Cr have relatively slower phase transition kinetics during similar cooling. Deformation of a complex Fe-28Al-5Cr alloy in the B2 phase regime creates a very high matrix dislocation concentration, which coincides with complete suppression of the B2{yields}D0{sub 3} phase transition during cooling.

• Research Organization: Oak Ridge National Lab., TN (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 10143480
• Report Number(s): CONF-921101--102; ON: DE93009724
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102
ALUMINIUM ALLOYS
CHROMIUM ALLOYS
DISLOCATIONS
IRON BASE ALLOYS
MOLYBDENUM ALLOYS
NIOBIUM ADDITIONS
ORDER-DISORDER TRANSFORMATIONS
STRUCTURE AND PHASE STUDIES
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION