SEDL / STP / STP924-EB / STP23207S

The Role of Cross-Slip of Screw Dislocations in Fatigue Behavior of Copper Single Crystals

Jin, NY
Cavendish Laboratory, Cambridge,
Shanghai Jiao Tong University, Shanghai,

Winter, AT
Cavendish Laboratory, Cambridge,

Pages: 9    Published: Jan 1988

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Abstract

Differently oriented copper single crystals were fatigued, where the Schmid factor for primary screw dislocations moving on the cross-slip plane differed markedly while that for primary slip remained more or less constant. The experimental results show that the cyclic hardening rate depends on crystal orientation. The saturation properties, the saturation stress, and the plastic strain in the persistent slipbands, are orientation independent. It seems likely that cross-slip is important only in the early stage of cyclic deformation, but not in the saturation.