Stress and temperature change creep deformation in polycrystalline and polysynthetically twinned Ti-47Al-2Nb-2Cr
- Michigan State Univ., East Lansing, MI (United States). Dept. of Materials Science and Mechanics
Stress change and temperature change creep tests were conducted on investment cast and HIPed near-{gamma} Ti-47Al-2Nb-2Cr alloy (in the duplex microstructure), and on polysynthetically twinned (PST) crystals prepared from the same alloy. Initial results of shear-compression creep on the PST crystal and polycrystals are compared with data from tensile creep tests. Specimens were deformed at 760--808 C (1,400--1,480 F) at strain rates near 10{sup {minus}7} s{sup {minus}1}. The PST crystal was cut so that {l_brace}111{r_brace} lamellar planes were parallel to the 45{degree} axis in a compression-shear fixture and with {l_angle}110{r_angle} directions parallel to the principle resolved shear stress. Both specimens exhibited normal transients. The PST crystal exhibited an activation energy of about 150 kJ/mol and a stress exponent of n{approx}5, with are different from values obtained from the polycrystal deformed under similar conditions (260 kJ/mol, n{approx}3). These data are discussed in terms of current understanding of creep deformation in the literature.
- OSTI ID:
- 225154
- Report Number(s):
- CONF-950201-; ISBN 0-87339-304-X; TRN: IM9621%%84
- 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
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Related Subjects
TITANIUM ALLOYS
CREEP
ALUMINIUM ALLOYS
NIOBIUM ALLOYS
CHROMIUM ALLOYS
INTERMETALLIC COMPOUNDS
SAMPLE PREPARATION
CASTING
HOT PRESSING
HEAT TREATMENTS
MONOCRYSTALS
X-RAY DIFFRACTION
ORIENTATION
TEMPERATURE DEPENDENCE
STRESSES
STRAIN RATE
ACTIVATION ENERGY
TWINNING
SLIP
LAMELLAE
EXPERIMENTAL DATA