Time-dependent stress concentration and microcrack nucleation in TiAl

Conference · Sun Dec 31 00:00:00 EST 1995

OSTI ID:225097

Yoo, M H ^[1]

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1. Oak Ridge National Lab., TN (United States). Metals and Ceramics Division

Localized stress evolution associated with the interaction of slip or twinning with an interface is treated by means of a superposition of the internal loading of a crystalline subsystem by dynamic dislocation pile-up and the stress relaxation by climb of interfacial dislocations. The peak value of a stress concentration factor depends on both the angular function that includes the effect of mode mixity and the ratio of characteristic times for stress relaxation and internal loading. The available experimental data on orientation and strain rate dependences of interfacial fracture mode in polysynthetically twinned TiAl crystals are discussed in view of the theoretical concepts presented in this paper.

• DOE Contract Number: AC05-84OR21400
• OSTI ID: 225097
• Report Number(s): CONF-950201-; ISBN 0-87339-304-X; TRN: IM9621%%27
• 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
DEFORMATION
ALUMINIUM ALLOYS
INTERMETALLIC COMPOUNDS
STRESSES
SLIP
TWINNING
INTERFACES
DISLOCATIONS
BURGERS VECTOR
SURFACE ENERGY
STRESS RELAXATION
ORIENTATION
STRAIN RATE
TIME DEPENDENCE
KINETICS
CRACKS
NUCLEATION