Disordering process in an Ll/sub 2/ ordered alloy. [(Ni/sub 70/Fe/sub 30/)/sub 3/(V/sub 58/Al/sub 40/Ti/sub 2/)]

Conference · Sun Jan 01 04:00:00 EST 1984

OSTI ID:5912656

Horton, J A; DasGupta, A; Liu, C T

The antiphase boundary (APB) structure and the disordering process have been studied by transmission electron microscopy (TEM) in a long-range-ordered alloy with Ll/sub 2/ structure and composition (Ni/sub 70/Fe/sub 30/)/sub 3/(V/sub 58/Al/sub 40/Ti/sub 2/). With an increase in temperature from a single-phase field into a two-phase field, disordering occurs both homogeneously within ordered domains and heterogeneously along APBs. Disordering continues by a ripening process with the disordered islands shrinking while the disordered bands on the prior APBs grow. The APBs are partially aligned on (100) while the material is single phase. As disordering proceeds, the degree of alignment of the disordered bands on (100) increases until complete alignment results. A correlation of the APB structure with room temperature mechanical properties indicates no dramatic change at the transition to the two-phase structure.

• Research Organization: Oak Ridge National Lab., TN (USA)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 5912656
• Report Number(s): CONF-841157-86; ON: DE85008152
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
ALUMINIUM ALLOYS
CRYSTAL STRUCTURE
ELECTRON MICROSCOPY
IRON ALLOYS
MECHANICAL PROPERTIES
MICROSCOPY
MICROSTRUCTURE
NICKEL ALLOYS
NICKEL BASE ALLOYS
ORDER-DISORDER TRANSFORMATIONS
PHASE TRANSFORMATIONS
TENSILE PROPERTIES
TITANIUM ALLOYS
TRANSMISSION ELECTRON MICROSCOPY
VANADIUM ALLOYS