Plastic heterogeneities of a copper multicrystal deformed in uniaxial tension: Experimental study and finite element simulations
Plastic heterogeneities of a copper multicrystal deformed in uniaxial tension: Experimental study and finite element simulations
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DOI：
10.1016/s1359-6454(99)00408-5
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发表时间：
2000-03-14
期刊：
影响因子：
9.4
通讯作者：
Rey, C
中科院分区：
文献类型：
--
作者：
Delaire, F;Raphanel, JL;Rey, C
在室温和低应变速率条件下，对单层晶粒铜试样进行单轴拉伸塑性变形。变形场的测量通过沉积在未变形的试样的抛光表面上的网格和局部取向记录在扫描电子显微镜中使用电子背散射图。这些措施进行了比较与模拟的有限元代码使用基于物理的模型的面心立方晶体的变形和硬化。测量值和计算值之间有很好的一致性。这些模拟提供了更多关于每一粒滑翔历史的细节，并有助于确定哪些系统在局部水平上是活跃的。它们还提供了内部变量的演化，如位错密度。一个新的见解粒间调节以及粒内的不均匀性。(C)2000年冶金学报由Elsevier Science Ltd.出版，版权所有。
A copper sample made of a single layer of grains is plastically deformed by uniaxial tension at room temperature and low strain rate. The deformation field is measured by means of grids deposited on the polished surface of the undeformed specimen and local orientations are recorded using electron back scattering diagrams in a scanning electron microscope. These measures are compared with simulations made by a finite element code using a physically based model for the deformation and hardening of face centered cubic crystals. A good agreement is found between measured and computed values. The simulations give access to much more detail about the history of glide in each grain and help establish which systems are active at a local level. They also provide the evolution of internal variables such as dislocation densities. A new insight into intergranular accommodation as well as intragranular heterogeneities is provided. (C) 2000 Acta Metallurgica Inc. Published by Elsevier Science Ltd. All rights reserved.