Cu双晶的循环形变行为与疲劳裂纹萌生Ⅰ.循环形变行为和滑移形貌

金属学报

1997, Vol. 33

Issue (8): 814-823

论文

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Cu双晶的循环形变行为与疲劳裂纹萌生Ⅰ.循环形变行为和滑移形貌

胡运明;王中光

中国科学院金属研究所材料疲劳与断裂国家重点实验室;沈阳;110015;中国科学院金属研究所材料疲劳与断裂国家重点实验室;沈阳;110015

CYCLIC DEFORMATION BEHAVIOR AND FATIGUE CRACK INIT1ATION IN COPPER BICRYSTALS

I. Cyclic Deformation Behavior and Slip Morphology HU Yunming; WANG Zhongguang (State Key Laboratory for Fatigue and Fracture of Materials; Institute of Metal Research; Chinese Academy ofSciences; Shenyang 110015) (Manuscript received 1996-09- 12; in revised form 1997-03-07)

引用本文:

胡运明;王中光. Cu双晶的循环形变行为与疲劳裂纹萌生Ⅰ.循环形变行为和滑移形貌[J]. 金属学报, 1997, 33(8): 814-823.
, . CYCLIC DEFORMATION BEHAVIOR AND FATIGUE CRACK INIT1ATION IN COPPER BICRYSTALS[J]. Acta Metall Sin, 1997, 33(8): 814-823.

全文: PDF(1764 KB)

摘要: 在切应变幅γpl≈1066×10-4至9．1×10-3s范围内，研究了四种Cu双晶的循环形变行为,实验结果表明，对于含两单滑移取向组元晶体的三种子行晶界双晶，其循环形变行为表现出和单滑移取向Cu单晶类似的特征，循环应力一应变（CSS）曲线上存在一平台区，但平台应力都高于单滑移取向Cu单晶的典型值（28MPa），且各有所差别对于含一单滑移和一双滑移组元晶体的垂直晶界双晶，CSS曲线上没有明显的平台，并且发现曲线与Cu多晶的CSS曲线非常类似表面形貌观察表明，上述循环形变行为与由于晶界约束而导致的双滑移或多沿移现象以及开动沿移系的位错反应强度密切相关

关键词 ： Cu双晶, 循环形变, 滑移形貌

Abstract：The cyclic deformation behavior of four types of copper bicrystals was; investi-gated over a shear strain amplitude (γpl) range from about 1 .66 x 1O-4 to about 9.1 x '1O-3. Ex-perimental results show that the cyclic deformation behavior of three types of ' copper bicrystals with grain boundaries parallel to loading axis is similar to that of a copper single crystal oriented for single slip, and the cyclic stress-strain (CSS) curves all contain a plateau. But the platcau stresses of the bicrystals are higher than the typical value 28 MPa off a single slip copper single crystal and are different from each other. While, for a bicrystals containing a grain boundary perpendicular to loading axis and two component crystals one one which is oriented for single slip and another is oriented for double slip, there is no plateau in the CSS curve, and it was found that the CSS quite is quite similar to that of copper polycrystals. Ob-servation of surface morphology shows that the above cyclic deformation behavior of the four types of bicrystals is closely related to the occurrence of double slip or multiple slip due to the constraint of grain boundary and the different degrees of dislocation interaction between the operative slip systems.

Key words： Cu bicrystal cyclic deformation slip morphology

收稿日期: 1997-08-18

基金资助:国家自然科学基金!19392300－4

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