CYCLIC DEFORMATION BEHAVIOUR OF Cu SINGLE CRYSTAL ORIENTED FOR DOUBLE SLIPS Ⅰ. Cyclic Hardening and Saturation

Acta Metall Sin

1994, Vol. 30

Issue (10): 431-438 DOI:

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CYCLIC DEFORMATION BEHAVIOUR OF Cu SINGLE CRYSTAL ORIENTED FOR DOUBLE SLIPS Ⅰ. Cyclic Hardening and Saturation

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GONG Bo; WANG Zhongguang; ZHANG Yiwei; LI Guangyi; ZHANG Tianyi(State Key Laboratory for Fatigue and Fracture of Materials; Institute of Metal Research; Chinese Academy of Sciences; Shenyang)(Manuscript received 16 March; 1994). CYCLIC DEFORMATION BEHAVIOUR OF Cu SINGLE CRYSTAL ORIENTED FOR DOUBLE SLIPS Ⅰ. Cyclic Hardening and Saturation. Acta Metall Sin, 1994, 30(10): 431-438.

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Abstract The cyclic hardening and saturation behaviour of Cu single crystals oriented for double slips ([034], [117]) and single slip ([125]) were investigated at plastic resolved shear strain amplitudes (γpl) over a range of 10~(-4)─ 10~(-2). The initial cyclic hardening behaviour of [034] crystal is found to be similar to that of [125] crystal. At γpl< 10~(-3), the cyclic hardening rate is lower and independent of γpl , reflecting the relative ease of primary dislocation multiplication. While at γpl> 10~(-3)', it increases significantly with increasing γpl, reflecting the dislocation interaction between primary slip and critical slip. [117] crystal shows much higher cyclic hardening rates at 10~(-4)<γpl < 5 × 10~(-3) as compared with two other crystals due to the strong dislocation interaction of primary and conjugate slips. Both [034] and [117] crystals display an obvious softening phenomenon after initial rapid hardening. The cyclic stress-strain curve (CSSC) of[034] crystal exhibits a plateau region, in which saturation shear stress is the same as that of [125] crystal. However, the upper limit of the plateau is lower (γpl～ 4.3×10~(-3)). The CSSC of [117] crystal is similar to that of polycrystal, showing almost no plateau. The saturation stress is monotonic function of γpl.Correspondent: GONG Bo, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015

Key words: Cu single crystal double slips cyclic deformation

Received: 18 October 1994

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