Je. Benci et Jc. Ma, THE MECHANICAL-BEHAVIOR OF AND DEFORMATION MECHANISMS IN AL2TI, Materials science & engineering. A, Structural materials: properties, microstructure and processing, 240, 1997, pp. 195-201
The mechanical properties of the binary intermetallic compound AI,TI s
how a strong dependence on test temperature and processing condition.
The compressive yield strength and plastic strain-to-failure of AI,Ti
as a function of temperature will be reviewed. Unlike many L1(2) compo
unds, binary Al2Ti with the Ga2Hf crystal structure, a body-centered t
etragonal-based structure, does not show any evidence of anomalous yie
ld strength behavior. Based on the crystallography of Al2Ti, various d
eformation modes are proposed. Possible partial dislocations and the p
lanar faults that would be associated with them are hypothesized. The
formation of antiphase boundaries (APBs) on {1 1 6}-the close-packed p
lanes-and {1 0 0} and complex stacking faults (CSFs) on {1 1 6} will b
e discussed. It does not appear to be possible to form a superlattice
intrinsic stacking fault (SISF) on {1 1 6}. Slip by 1/2(1 1 0) partial
dislocations on {0 0 1} with the formation of a stacking fault may al
so be an important deformation mechanism and will be discussed. Therma
lly-activated cross-slip of APE-coupled partial dislocations from {1 1
6} onto {1 0 0} is not expected to be important in this material base
d on the observed mechanical behavior. (C) 1997 Elsevier Science S.A.