Effects of Molybdenum, Titanium and Silicon Additions on the Do 3 ⇄ B2 Transition Temperature for Alloys near Fe3 Al

Authors

R. T. Fortnum, Michigan Technological University
D. E. Mikkola, Michigan Technological University

Document Type

Article

Publication Date

7-1987

Department

Department of Materials Science and Engineering

Abstract

Additions of molybdenum, silicon and titanium to Fe Al alloys with an aluminium content in the range 20-28 at.% have been found to increase the D03 ⇄ B2 transition temperature T_c by as much as 250°C over that for binary Fe Al alloys (T_c ≈ 540°C). These increases in T_c have been related to increases in the ordering energies of the DO₃ superlattice caused by specific site substitutions by the solutes. The study of a variety of alloys, both ternary and higher order, has permitted development of an empirical expression relating T_c to the amounts of moly b-denum and titanium as well as to the aluminum content. The effectiveness of the solutes in raising T_c decreases in the order silicon, titanium and molybdenum.

Publisher's Statement

© 1987

Publication Title

Materials Science and Engineering

Recommended Citation

Fortnum, R., & Mikkola, D. (1987). Effects of Molybdenum, Titanium and Silicon Additions on the Do 3 ⇄ B2 Transition Temperature for Alloys near Fe3 Al. Materials Science and Engineering, 91, 223-231. http://doi.org/10.1016/0025-5416(87)90301-6
Retrieved from: https://digitalcommons.mtu.edu/michigantech-p/5410