Mechanical behaviour and in situ observation of shear bands in ultrafine grained Pd and Pd–Ag alloys
Mechanical behaviour and in situ observation of shear bands in ultrafine grained Pd and Pd–Ag alloys
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DOI：
10.1016/j.actamat.2009.10.013
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发表时间：
2010-02
期刊：
影响因子：
9.4
通讯作者：
K. Yang;Y. Ivanisenko;A. Caron;A. Chuvilin;L. Kurmanaeva;T. Scherer;R. Valiev;H. Fecht
中科院分区：
文献类型：
--
作者：
K. Yang;Y. Ivanisenko;A. Caron;A. Chuvilin;L. Kurmanaeva;T. Scherer;R. Valiev;H. Fecht
采用原位拉伸实验和灰度相关法研究了超细晶Pd和Pd-x在.%时的变形过程Ag（x=5或20）合金，通过高压扭转生产。剪切带形核和扩展被认为是拉伸试验中应变局部化之后的重要变形机制。其微观机制与晶界协同滑动有关。此外，堆垛层错能的额外影响被发现改变的性质的变形机制从局部应变在Pd更均匀的变形在Pd-20%Ag。原位分析和研究结果是新的，并提供了创新的见解变形的基础上UFG面心立方金属。
An in situ tensile test with grey scale correlation has been performed to study the deformation process in ultrafine grained (UFG) Pd and Pd–x at.% Ag (x=5 or 20) alloys produced by high-pressure torsion. Shear band nucleation and propagation was found to be an important deformation mechanism after strain localization during the tensile test. The underlying microscopic mechanism is related to cooperative grain boundary sliding. Moreover, the additional influence of stacking fault energy was found to change the nature of the deformation mechanism from localized strain in Pd to more homogeneous deformation in Pd–20% Ag. In situ analysis and the findings are new and give innovative insight into the basics of deformation in UFG face-centred cubic metals.