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Homogenization of Ingot Metallurgy Near-Gamma Titanium Aluminides

Published online by Cambridge University Press:  26 February 2011

S.L. Semiatin ,
P. Mcquay ,
M. Stucke ,
W.R. Kerr ,
Y-W. Kim  and
S. El-Soudani
S.L. Semiatin
Affiliation:
Battelle Memorial Institute, Columbus, OH 43201
P. Mcquay
Affiliation:
Wright Research and Development Center, Wright Patterson AFB, OH 45433
M. Stucke
Affiliation:
Wright Research and Development Center, Wright Patterson AFB, OH 45433
W.R. Kerr
Affiliation:
Wright Research and Development Center, Wright Patterson AFB, OH 45433
Y-W. Kim
Affiliation:
Metcut Materials Research Group, Wright Patterson AFB, OH 45433
S. El-Soudani
Affiliation:
North American Aircraft, Rockwell International, Downey, CA 90241
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Abstract

The elimination of microsegregation and subsequent breakdown of the lamellar structure in near-gamma titanium aluminides was investigated through a series of high temperature homogenization heat treatments and isothermal hot compression tests. The homogenization heat treatment studies revealed that microsegregation could be eliminated after approximately five hours or one and one-half hours at temperatures either 15 C or 40 C, respectively, above the transus in the single phase alpha field. Subsequent attempts to breakdown the coarse prior alpha grain, lamellar structure were successful at low strain rates (∼ 10−3 s−1) and temperatures low in the alpha + gamma phase field, but led to wedge cracking and gross fracture at high strain rates (∼ 1 s−1) high in the alpha + gamma phase field. Subsequent annealing treatments to globularize the hot-worked structure in order to obtain a uniform, fine, and stable grain structure were also identified.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 213: Symposium Q – High-Temperature Ordered Intermetallic Alloys IV , 1990 , 883
Copyright
Copyright © Materials Research Society 1991

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References

REFERENCES

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