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Microstructure and Compressive Properties of Fe-Modified L12-TYPE Al3Ti

Published online by Cambridge University Press:  28 February 2011

H.R. Pak ,
C.M. Wayman ,
L.H. Favrow ,
C.V. Cooper  and
J.S.L. Pak
H.R. Pak
Affiliation:
University of Illinois, Department of Materials Science and Engineering, Urbana, IL 61801
C.M. Wayman
Affiliation:
University of Illinois, Department of Materials Science and Engineering, Urbana, IL 61801
L.H. Favrow
Affiliation:
United Technologies Research Center, East Hartford, CT 06108
C.V. Cooper
Affiliation:
United Technologies Research Center, East Hartford, CT 06108
J.S.L. Pak
Affiliation:
University of Illinois, Department of Materials Science and Engineering, Urbana, IL 61801
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Abstract

The microstructures and mechanical properties of an Fe-modified L12 alloy containing 7.5 at.% Fe have been investigated. This alloy has been determined to be essentially single phase following a homogenization heat treatment (HHT) at 1100°C for 100h, with a very small volume fraction of precipitates having been observed to form along dislocations. Conversely, in the case of the as-cast (AC) condition, the alloy has been determined to contain band-like precipitates, which have also formed along dislocations. In addition, a high density of very thin plate-like precipitates have formed parallel to {001} planes of the L12 matrix. Although these plate-like precipitates appear to exhibit lattice tetragonality, their crystal structure cannot be explained by assuming D022 and D023 structures. Five different <110>-type dislocations havfe been activated within a small region of a matrix grain during deformation at 1100°C, some of which cross slipped from {111} to {001} planes. Specimens in both AC and HHT conditions were deformed in compression to approximately 0.5% without fracture at both 22 and 1 100°C, the yield stress for the HIT condition having been determined to be 192 MPa at 22°C and 98 MPa at 1100°C.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 186: Symposium I – Alloy Phase Stability and Design , 1990 , 357
Copyright
Copyright © Materials Research Society 1991

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