The role of strain compatibility in the cyclic deformation of copper bicrystals
The role of strain compatibility in the cyclic deformation of copper bicrystals
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DOI：
10.1016/s1359-6454(96)00384-9
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发表时间：
1997-07
期刊：
影响因子：
9.4
通讯作者：
P. Peralta;C. Laird
中科院分区：
文献类型：
--
作者：
P. Peralta;C. Laird
为了加深我们对单晶和多晶材料循环变形之间联系的理解，我们对铜双晶进行了研究。在高周应变控制下，对[1 49](90°和180°)等轴扭曲晶界和[1 49]/[001]双晶进行了应变控制试验，所有这些晶界都垂直于张力轴。当晶界产生协调应力时，出现了以多滑移为主的晶界影响区。实验表明，宏观相容的180°晶界双晶的疲劳行为与单晶相似，而其他取向错位的双晶的疲劳响应表现为晶界效应，增加了循环应力。分别测量了[1 49]/[0 0 1]样品中各颗粒的应变。在初始硬化过程中，相邻晶体中的塑性变形发生振荡；最后，软晶所承载的塑性应变大约是其他晶粒的5倍。©1997 Acta Metallurica Inc.
In order to improve our understanding of the link between the cyclic deformation of single crystals and of polycrystalline materials, a study was performed on copper bicrystals. Testing under strain control within the high cycle regime was performed in isoaxial [1 49] (90° and 180°) twist boundaries and [1 49]/[001] bicrystals, all with boundaries perpendicular to the tensile axis. A Grain Boundary Affected Zone (GBAZ), where multiple slip dominated, appeared when the boundaries developed compatibility stresses. Experiments showed that the behavior of macroscopically compatible bicrystals, 180° boundaries, is approximately similar to that of a monocrystal, whereas the fatigue responses of the other misorientation show a grain boundary effect, which increases the cyclic stress. The strain in each grain of the [1 49]/[001] sample was measured separately. The plastic deformation in the adjacent crystals oscillated during initial hardening; finally, the soft grain carried approximately five times the plastic strain of the other grain. © 1997 Acta Metallurgica Inc.