Deformation and fracture behavior of TiAl

Conference · Sun Dec 31 23:00:00 EST 1989

DOI:https://doi.org/10.1557/PROC-186-265· OSTI ID:7123801

Fu, C L; Yoo, M H

First-principles total-energy calculations of the elastic constants, shear fault energies, and cleavage energies of TiAl are presented. We find a large elastic shear anisotropy along the (011) direction, and high APB energies due to the strong cohesion between Ti and Al layers. Shear faults of SISF SESF, and twin boundary are predicted to be prevalent due to their low energies. The anomalous temperature dependence of flow stress is explained by the cross-slip pinning and fault dragging mechanisms. The intrinsic brittleness of TiAl is discussed in terms of the low mobility of 1/2(110) dislocations. 17 refs., 2 figs., 1 tab.

• Research Organization: Oak Ridge National Lab., TN (USA)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 7123801
• Report Number(s): CONF-900466-57; ON: DE90012212
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102 -- Metals & Alloys-- Structure & Phase Studies
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
ALUMINIUM ALLOYS
BRITTLE-DUCTILE TRANSITIONS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DEFORMATION
DISLOCATIONS
FRACTURE PROPERTIES
INTERMETALLIC COMPOUNDS
LINE DEFECTS
MECHANICAL PROPERTIES
SHEAR
TITANIUM ALLOYS