Iron–Aluminium-Base Alloys with Strengthening Laves Phase for Structural Applications at High Temperatures

Abstract:

Fe-Al-Ta alloys with the ternary Laves phase Ta(Fe0.5+x, Al0.5-x)2 are studied experimentally with the objective of clarifying the effect of Laves phase precipitation and atomic ordering on the deformation characteristics of such Fe-Al-base alloys. The present study concentrates on the hardening effect of the Laves phase in ordered and disordered Fe-Al-Ta alloys with Al contents between 16 and 45 at.% showing the A2 disorder or the DO3 or B2 order. Ta has a low solubility in Fe-Al alloys which is beneficial for slowing down precipitate coarsening. Small amounts of Laves phase together with atomic ordering increase the yield stress and affect ductility in a complex way. The alloys with 1% Ta exhibit a high oxidation resistance. The continuing work aims at adjusting the Al and Ta content for an optimum relation of high-temperature strength and low-temperature ductility with maintaining a sufficient oxidation resistance.

• Periodical: Materials Science Forum (Volumes 475-479)
• Pages: 865-868
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.475-479.865
• Online since: January 2005
• Authors: D.D. Risanti, G. Sauthoff
• Keywords: Fe-Al-Ta Alloys, Iron Aluminide, Laves Phases

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DOI: 10.1016/j.intermet.2005.02.007

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