Effect of deviation from the stoichiometry on the lattice constants and strength of the L1{sub 0}TiAl-X (X = Cr, V or Nb) alloys at ambient temperature

Book · Sun Dec 31 00:00:00 EST 1995

OSTI ID:225107

Kobayashi, Equo ^[1]; Shinmoto, Koichiro; Miura, Seiji; Mishima, Yoshinao ^[2]; Suzuki, Tomoo ^[3]

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1. Tokyo Medical and Dental Univ. (Japan). Inst. for Medical and Dental Engineering
2. Tokyo Inst. of Technology, Yokohama (Japan)
3. Hokkaido Univ., Sapporo (Japan)

Variations in compressive 0.2% flow stress are measured in binary and ternary L1{sub 0} gamma TiAl alloys with deviation from the stoichiometry and ternary additions of Cr, V and Nb. A special attention is paid in the choice of the ternary compositions so that the effect of Al concentration on the strength of the alloy scan be deduced in each ternary alloys. Also the effect of difference in grain size among the alloys is taken into account to interpret the results. It is found that the strength as measured by 0.2% flow stress decreases with increasing Al concentration not only in binary alloys with more than 50 at%Al but also in ternary alloys across the stoichiometry, which is rather contradictory to the previous findings by hardness tests. For both binary and ternary alloys, variation in lattice constants is also measured by X-ray diffractometry as a function of Al concentration. The results are in good agreement with the previous work, in which c/a increases with increasing Al concentration. The present results should provide useful information on the basic understanding of the mechanical properties of the single phase gamma TiAl alloys.

• OSTI ID: 225107
• Report Number(s): CONF-950201-; ISBN 0-87339-304-X; TRN: IM9621%%37
• Resource Relation: Conference: Annual meeting and exhibition of the Minerals, Metals and Materials Society (TMS), Las Vegas, NV (United States), 12-16 Feb 1995; Other Information: PBD: 1995; Related Information: Is Part Of Gamma titanium aluminides; Kim, Y.W. [ed.] [UES, Inc., Dayton, OH (United States). Materials and Processes Div.]; Wagner, R. [ed.] [GKSS Research Center, Geesthacht (Germany). Inst. for Materials Research]; Yamaguchi, Masaharu [ed.] [Kyoto Univ. (Japan). Dept. of Materials Science and Engineering]; PB: 1023 p.
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
TITANIUM ALLOYS
MICROSTRUCTURE
COMPRESSION STRENGTH
ALUMINIUM ALLOYS
CHROMIUM ALLOYS
VANADIUM ALLOYS
NIOBIUM ALLOYS
INTERMETALLIC COMPOUNDS
OPTICAL MICROSCOPY
FLOW STRESS
STRAIN RATE
CHEMICAL COMPOSITION
PHASE DIAGRAMS
GRAIN SIZE
LATTICE PARAMETERS
X-RAY DIFFRACTION
EXPERIMENTAL DATA