在塑性分切应变幅（γｐｌ）为１０~（－４）─１０~（－２）的范围，研究了双滑移取向（［０３４］，［１１７］）和单滑移取向（［１２５］）Ｃｕ单晶的循环硬化及饱和行为．［０３４］晶体的初始循环硬化规律与［１２５］晶体的相似，在γｐｌ小于１０~（－３）的范围，硬化速率（θ＿（０．２））较低，且不依赖于γｐｌ；当γｐｌ＞１０~（－３）时，硬化速率随γｐｌ的增加快速上升．［１１７］晶体在１０~（－４）＜γｐｌ＜５×１０~（－３）范围的初始硬化速率显著高于其它二种晶体．二种双滑移取向晶体在快速硬化之后、均有明显的软化现象．［０３４］晶体的循环应力－应变曲线（ＣＳＳＣ）有一平台区，饱和应力与单滑移晶体的相近，但平台区较短（上限为γｐｌ～４．３×１０~（－３））．［１１７］晶体的ＣＳＳＣ几乎不存在平台区，饱和应力是γｐｌ的单调升函数，与多晶体的ＣＳＳＣ相似．上述循环形变行为与不同滑移系之间的位错反应特点一致．
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
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