Plasticity of Single Crystalline Al3X Intermetallic Compounds

摘要

Single crystals of six different compositions were grown, five of A13 Ti + Fe andone 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. Al3Ti, Dislocations, Ductility, Flow Strength, Intermetallic Compounds.