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Hot Extrusion of A Ti-Al-Nb-Mn Alloy

Published online by Cambridge University Press:  26 February 2011

V. Seetharaman ,
J. C. Malas  and
C. M. Lomibard
V. Seetharaman
Affiliation:
Universal Energy Systems, Inc., Processing Science Division, Dayton, OH 45432
J. C. Malas
Affiliation:
WRDC/MLLN, Wright-Patterson Air Force Base, OH 45433
C. M. Lomibard
Affiliation:
WRDC/MLLN, Wright-Patterson Air Force Base, OH 45433
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Abstract

Forward extrusion of a gamma-TiAl alloy (Ti-49.5A1-2.5Nb-l.lMn) was investigated, with special reference to the role of preheat temperature, ram velocity, and can material. Cylindrical billets were sealed in evacuated cans, soaked at extrusion temperatures ranging from 1050 to 1350°C for 2 hr and then extruded through streamlined dies held at 260°C. Microstructural features of the extruded billets which evolved under steady-state conditions were characterized. In conjunction with these observations, a coupled (thermal-deformation) finite-element analysis procedure was used to predict the local distributions of strain, strain rate, temperature, and stress present during extrusion. The microstructures of the extruded products are compared with those obtained in samples subjected to isothermal constant-strain-rate compression tests.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 213: Symposium Q – High-Temperature Ordered Intermetallic Alloys IV , 1990 , 889
Copyright
Copyright © Materials Research Society 1991

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References

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