Hostname: page-component-78c5997874-dh8gc Total loading time: 0 Render date: 2024-11-20T02:38:16.995Z Has data issue: false hasContentIssue false
  • English
  • Français

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
Get access

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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 39: Symposium G – High-Temperature Ordered Intermetallic Alloys I , 1984 , 109
Copyright
Copyright © Materials Research Society 1985

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

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

REFERENCES

1. DasGupta, A., Horton, J. A., and Liu, C. T., paper in present proceedings.Google Scholar
2. Liu, C. T., Int. Met. Reviews 29(3), 168 (1984).Google Scholar
3. Liu, C. T., paper in present proceedings.Google Scholar
4. Horton, J. A., Gupta, A. Das, and Liu, C. T. in: Proceedings of the 42nd Annual Meeting of the Electron Microscopy Society of America, ed., Bailey, G. W. (San Francisco Press, San Francisco 1984) p. 486.Google Scholar
5. Van der Wegen, G.J.L., Bronsveld, P. M., and De Hosson, J.Th.M., Met. Trans. A 12A,2125 (December 1981).Google Scholar
6. Yodogawa, M., Wee, D., Oya, Y., and Suzuki, T., Scripta Met. 14, 849–854 (1980).Google Scholar
7. Morinaga, M., Acta Met. 25, 957–962 (1977).Google Scholar