Plasticity of Single Crystalline Al3X Intermetallic Compounds
Annual rept. 3 Jul 1990-31 Mar 1991
PENNSYLVANIA UNIV PHILADELPHIA DEPT OF MATERIALS SCIENCE AND ENGINEERING
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This report summarizes our progress on this program in three areas Deformation of Ll2 single crystalline Al3Ti Fe, high resolution transmission electron microscopy of dislocations and faults in this material, and computer simulations of dislocations and faults in both the DO22 and Ll2 form. The slip systems have been determined from macroscopic and microscopic analysis, and a new form of dislocation dissociation has been observed. The computer simulations have shown why the temperature dependence of the flow strength is so distinct at low temperatures and why the DO22 form is always so brittle.