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Annealing Studies of B2 FeAl

Published online by Cambridge University Press:  26 February 2011

Berndt Schmidt ,
Pavan Nagpal  and
Ian Baker
Berndt Schmidt
Affiliation:
Thayer School of Engineering, Dartmouth College, Hanover NH 03755
Pavan Nagpal
Affiliation:
Thayer School of Engineering, Dartmouth College, Hanover NH 03755
Ian Baker
Affiliation:
Thayer School of Engineering, Dartmouth College, Hanover NH 03755
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Abstract

Rods of five FeAl alloys whose compositions span the B2 phase field (34–51 at. % Al) were produced by multiple hot extrusions of ingots. Samples of each alloy were annealed in air at 1173K and 1473K in order to study the effect of alloy composition on both the grain growth kinetics and on the rate of oxidation. Little oxidation occurred at 1173K but at 1473K the oxidation rate was found to decrease with increasing aluminum concentration. The predominant oxide was found to be α-A12O3. The grain size was found to increase rapidly during the first hour of annealing at both temperatures after which it increased more slowly. The grain growth rate was found to decrease with increasing aluminum content.

Hardness measurements were made on both as-extruded and annealed samples of FeAl. Hardness increased with increasing aluminum content. The hardness was higher in annealed and air-cooled samples due to vacancy retention. Compression tests of air-cooled, annealed samples also showed higher yield strengths than as-extruded samples. Yield strength and strain hardening rate were found to increase and the ductility was found to decrease with increasing aluminum content.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 133: Symposium H – High-Temperature Ordered Intermetallic Alloys III , 1988 , 755
Copyright
Copyright © Materials Research Society 1989

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References

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