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Processing and Properties of FeAl Sheets Obtained by Roll Compaction and Sintering of Water Atomized Powder

Published online by Cambridge University Press:  10 February 2011

S. C. Deevi ,
M. R. Hajaligol ,
V. K. Sikka ,
J. McKernon  and
C. R. Scorey
S. C. Deevi
Affiliation:
Research Center, Philip Morris USA, 4201 Commerce Road, Richmond, VA 23234:
M. R. Hajaligol
Affiliation:
Research Center, Philip Morris USA, 4201 Commerce Road, Richmond, VA 23234:
V. K. Sikka
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831.
J. McKernon
Affiliation:
Ametek Specialty Metals Division, Wallingford, CT 06492.
C. R. Scorey
Affiliation:
Ametek Specialty Metals Division, Wallingford, CT 06492.
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Abstract

The low ductilities of FeAl alloys led us to explore powder metallurgical processing technology to obtain sheets of 0.2mm thickness as opposed to manufacturing processes based on hot rolling of cast FeAl alloys. In our approach, water atomized FeAl powders were roll compacted to 0.66mm with a polymeric binder using two counter rotating rolls to a green density of 3.1 g/cc. Roll compacted green sheets were then de-bindered in nitrogen in the temperature range of 300 to 600°C for several hours prior to sintering the sheets in vacuum. Sintered sheets were rolled down from 0.66 to 0.20 mm in three different stages resulting in a total reduction of 69% Vacuum annealing of the sheets was carried out between each stage of the reduction process to eliminate edge cracking associated with the work hardening of the FeAl. The properties of the FeAl sheets depend on the Al content, annealing temperature and time in a vacuum furnace. The fine microstructure of FeAl sheets led to tensile elongations of 4 to 6%. The sheets are formable at room temperature, and possess excellent mechanical properties both at room and high temperatures.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 552: Symposium KK – High-Temperature Ordered Intermetallic Alloys VIII , 1998 , KK4.6.1
Copyright
Copyright © Materials Research Society 1999

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References

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