Ordered iron aluminide alloys having an improved room-temperatur

Details Ordered iron aluminide alloys having an improved room-temperatur Ordered iron aluminide alloys having an improved room-temperatur

1990-07-02

1992-01-28

Yee, Deborah

Metal treatment

Compositions

Heat treating

148 124, 148320, C21D 800

Patent

active

050841092

ABSTRACT:
A process is disclosed for improving the room temperature ductility and strength of iron aluminide intermetallic alloys. The process involves thermomechanically working an iron aluminide alloy by means which produce an elongated grain structure. The worked alloy is then heated at a temperature in the range of about 650.degree. C. to about 800.degree. C. to produce a B2-type crystal structure. The alloy is rapidly cooled in a moisture free atmosphere to retain the B2-type crystal structure at room temperature, thus providing an alloy having improved room temperature ductility and strength.

REFERENCES:
patent: 2768915 (1956-10-01), Nachman et al.
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J. F. Nachman et al., "16 Percent Aluminum-Iron Alloy Cold Rolled in the Order-Disorder Temperature Range", Journal of Applied Physics, vol. 25, pp. 307-313, Mar. 1954.
W. Justusson et al., "The Mechanical Properties of Iron-Aluminide Alloys", Transactions of the ASM, vol. 49, pp. 905-923, 1956.
V. K. Sikka et al., "Fabrication and Mechanical Properties of Fe.sub.3 Al-Based Iron Aluminides", Oak Ridge National Laboratory Report TM-11465 (Mar. 1990).
C. G. McKamey et al., "Effect of Chromium on Room Temperature Ductility and Fracture Mode in Fe.sub.3 Al", Scripta Metallurgica, vol. 22, pp. 1679-1681 (1988).
M. G. Mendiratta et al., "Tensile Flow and Fracture Behavior of DO.sub.3 Fe-25 At. Pct. Al and Fe-31 At. Pct. Al Alloys", Metallurgical Transactions A, vol. 18A, pp. 283-291 (Feb. 1987).
F. X. Kayser, "Iron-Aluminum Alloy Systems", WADC Technical Report 57-298, Part 1, May 1957.

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