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金属学报  1994, Vol. 30 Issue (10): 431-438    
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双滑移取向Cu单晶的循环形变行为──Ⅰ.循环形变行为
宫波;王中光;张轶伟;李广义;张天宜
中国科学院金属研究所材料疲劳与断裂国家重点实验室
CYCLIC DEFORMATION BEHAVIOUR OF Cu SINGLE CRYSTAL ORIENTED FOR DOUBLE SLIPS Ⅰ. Cyclic Hardening and Saturation
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)
引用本文:

宫波;王中光;张轶伟;李广义;张天宜. 双滑移取向Cu单晶的循环形变行为──Ⅰ.循环形变行为[J]. 金属学报, 1994, 30(10): 431-438.
, , , , . CYCLIC DEFORMATION BEHAVIOUR OF Cu SINGLE CRYSTAL ORIENTED FOR DOUBLE SLIPS Ⅰ. Cyclic Hardening and Saturation[J]. Acta Metall Sin, 1994, 30(10): 431-438.

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摘要: 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.
关键词 Cu单晶双滑移循环形变    
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
收稿日期: 1994-10-18     
基金资助:国家自然科学基金
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