SUBSTITUTIONAL SOLUTES IN ALCO .2. HARDENING AND CORRELATIONS WITH DEFECT STRUCTURE

Solid solution hardening effects are reported for Al-Co-based binary and ternary alloys as a function of off-stoichiometry and of the substitution of the solutes Mn and Re for Co, and of Ti, for Al. Microhardness and stepped flow stress are reported as a function of temperature. Hardening is of the magnitude expected to be caused by conventional elastic interactions between point defects and moving dislocations. For binary alloys the strengths of the interactions are in the proper relative strengths, but not for ternary alloys. In ternary alloys the effects of multiple types of defects are superimposed, but not yet adequately characterized.