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The Disordering Process in an Ll2 Ordered Alloy*
Published online by Cambridge University Press: 21 February 2011
Abstract
The antiphase boundary (APB) structure and the disordering process have been studied by transmission electron microscopy (TEM) in a long-rangeordered alloy with Ll2 structure and composition (Ni70Fe30)3(V58Al40Ti2). 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.
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- Copyright © Materials Research Society 1985
Footnotes
Research sponsored by the Office of Energy Systems Research, Division of Energy Conservation and Utilization Technologies (ECUT), U.S. Department of Energy under Contract DE-ACO5-840R21400 with toe Martin Marietta Energy Systems, Inc.
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