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The positron trapping efficiency of dislocations in deformed dilute aluminium alloys

Positron-lifetime measurements have been made on deformed Al-0.01 at.% Mg, Al-0.01 at.% Si and Al-0.01 at.% Cu alloys at room temperature. The specific trapping rate mu d of positrons into dislocations depends strongly on alloying elements. Mg and Cu atoms can reduce mu d to a great extent, while Si atoms are not so effective. These results are closely related to the pinning of dislocations by solute atoms.