Internal Friction Peaks of Cold Worked Pure Aluminum and Its Dilute Alloys

Abstract

Internal friction of cold worked pure aluminum and its dilute alloys is measured as a function of temperature with a fully automatic inverted torsion pendulum. Both the Bordoni and the Hasiguti peaks in pure aluminum are suppressed by the addition of small amounts of solute elements. In place of them Hasiguti type solute peaks are observed in all the alloys investigated. These peaks are interpreted to be due to the interaction between dislocations and solute elements. The period of vibration measured simultaneously with internal friction is differentiated with respect to temperature and a new method to determine the activation energy with the use of it is proposed.