Debris Mechanism of Strain-Hardening

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Abstract
Strain‐hardening caused by ``debris'' produced by multiple cross‐glide is discussed. This form of strain‐hardening is often linearly proportional to strain, because the debris concentration increases in proportion to strain. The rate of debris production should be sensitive to the applied stress, crystal structure, and crystal orientation as is observed. The debris mechanism is the only one that explains the self‐hardening of isolated half‐loops. It also explains the negative temperature dependence of strain‐hardening at low temperatures, unlike other theories. The cross‐gliding that leads to debris production is influenced by free surfaces which exert a cross‐glide force on obliquely incident dislocations, and which cause extended dislocations to become contracted so they can more easily cross‐glide.