Metal

Deformation (meteorology)

Linguistics

Philosophy

Metallurgy

Materials science

Stress (linguistics)

Social psychology

Stress relaxation

Copper wire

Creep

Physics

Psychology

Relaxation (psychology)

Condensed matter physics

Composite material

Dislocation

Copper

Scripta Materialia

Torsional stress relaxation experiments on thin copper wires are performed. A size effect is observed. That is a faster relaxation deformation arises in a thinner wire. As the wire diameter increases, the activation volume increases but the strain rate sensitivity decreases. A greater effect of geometrically necessary dislocations on the relaxation deformation accounts for the size effect. In a thinner wire, geometrically necessary dislocations undergo fewer obstacles to reach the wire center and then neutralize, causing a more rapid evolution of mobile dislocations.

Geometrically necessary dislocations induced size effect in the torsional stress relaxation behavior of thin metallic wires