Plasticity of Single Crystalline Al3X Intermetallic Compounds
Final rept. 1 Nov 1988-31 Dec 1991
PENNSYLVANIA UNIV PHILADELPHIA DEPT OF MATERIALS SCIENCE AND ENGINEERING
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Single crystals of six different compositions were grown, five of A13 Ti Fe and one of A13 TI Cr. The flow stress was measured as a function of temperature, orientation and composition. A12Ti precipitates are the major strengthening phase and form platelets on the 100 planes of the L12 matrix. Deformation occurs primarily by 110 111 slip, with SISF dissociation at low temperatures and by APB dissociation at high temperatures. Simulations of dislocation cores using many body potentials have revealed a variety of core configurations in the L12 and D022 form, all of which are sessile and one of which provides a twinning mechanism.
- Properties of Metals and Alloys
- Fluid Mechanics