Alloys or metallic compositions – Titanium base – Chromium or molybdenum containing
Patent
1991-08-08
1993-08-03
Roy, Upendra
Alloys or metallic compositions
Titanium base
Chromium or molybdenum containing
148421, 148671, 420417, 420419, C22C 1400
Patent
active
052326616
ABSTRACT:
This invention relates to TiAl based intermetallic compound alloy and process for producing; the object of this invention is to improve high temperature deformability. The alloy comprises basic components: Ti.sub.y AlCr.sub.x, wherein 1%.ltoreq.X.ltoreq.5%, 47.5%.ltoreq.Y.ltoreq.52%, and X+ 2Y.gtoreq.100%, and comprises a fine-grain structure with a .beta. phase precipitated on a grain boundary of equiaxed .gamma. grain having grain size of less than 30 .mu.m, and possessing a superplasticity such that the strain rate sensitivity factors (m value) is 0.40 or more and tensile elongation is 400% or more tested at 1200.degree. C. and a strain rate of 5.times.10.sup.-4 S.sup.-1.
REFERENCES:
patent: 4842819 (1989-06-01), Huang et al.
patent: 5028277 (1991-07-01), Mizoguchi et al.
patent: 5028491 (1991-07-01), Huang et al.
Wunderlich et al., Z. Metallkoe, 81 (Nov. 1990), 802.
Vujic et al., Met. Trans. 19A (1988) 2445.
Abstract of Autumn Symposium of the Japan Institute of Metals (1989), p. 238.
Abstract of Autumn Symposium of the Japan Institute of Metals (1989), p. 245.
In the Material of 53th Meeting of Superplasticity, (Jan. 30, 1990, pp. 1-5).
Abstract of General Lecture in Autumn Symposium of the Japan Institute of Metals (1988) p. 498.
Fujii Hideki
Hanamura Toshihiro
Hashimoto Keizo
Kimura Masao
Masahashi Naoya
Nippon Steel Corporation
Roy Upendra
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