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The Disordering Process in an Ll2 Ordered Alloy*

Published online by Cambridge University Press:  21 February 2011

J. A. Horton,
A. Dasgupta and
C. T. Liu
J. A. Horton
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, P. O. Box X, Oak Ridge, TN 37831
A. Dasgupta
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, P. O. Box X, Oak Ridge, TN 37831
C. T. Liu
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, P. O. Box X, Oak Ridge, TN 37831
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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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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.

References

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