Effects of Alloying Additions of Titanium, Molybdenum, Silicon, Hafnium and Tantalum on the Microstructure of Iron Aluminides near Fe3 Al

Authors

H. P. Longworth, Michigan Technological University
D. E. Mikkola, Michigan Technological University

Document Type

Article

Publication Date

12-1987

Department

Department of Materials Science and Engineering

Abstract

Additions of titanium, molybdenum, silicon, hafnium and/or tantalum to FeAl alloys near the composition Fe₃Al have been found to affect many microstructural features including antiphase domain size, types and crystallography of antiphase and interphase boundaries, and slip vectors. In addition, different microstructures are developed with changes in aluminum content in complex alloys containing molybdenum, titanium and hafnium. In particular, with decreasing aluminum level, the microstructure changes from a single phase D0₃ superlattice to a structure having elongated ordered domains with a thin layer of the disordered phase along the antiphase boundaries, and finally to a two-phase modulated structure with D0₃ domains aligned along 〈100〉 directions in a disordered matrix. Stabilization of the D0₃ structure through alloying with molybdenum and titanium causes the slip vector to change from the usually observed 〈111〉 to 〈110〉 which is in agreement with the crystallographic symmetry.

Publisher's Statement

© 1987

Publication Title

Materials Science and Engineering

Recommended Citation

Longworth, H., & Mikkola, D. (1987). Effects of Alloying Additions of Titanium, Molybdenum, Silicon, Hafnium and Tantalum on the Microstructure of Iron Aluminides near Fe3 Al. Materials Science and Engineering, 96, 213-229. http://doi.org/10.1016/0025-5416(87)90555-6
Retrieved from: https://digitalcommons.mtu.edu/michigantech-p/5414