The Deformation Measurements of Portevin-Le Chatelier Shear Bands in Al-Cu Alloys
XIANG Guofu; ZHANG Qingchuan; LIU Haowen; JIANG Huifeng; WU Xiaoping
中国科学技术大学力学与机械工程系
Cite this article:
XIANG Guofu; ZHANG Qingchuan; LIU Haowen; JIANG Huifeng; WU Xiaoping. The Deformation Measurements of Portevin-Le Chatelier Shear Bands in Al-Cu Alloys. Acta Metall Sin, 2006, 42(6): 619-623 .
Abstract A series of white light speckle patterns was continually recorded by
high-speed CCD (1000 fps) during the formation of type B serrated
yielding (PLC) shear
band in tensile tests of Al-4%Cu alloy. With the image analysis
technology of digital speckle correlation method, the displacement and
strain spatial distribution of PLC shear band were quantitatively obtained,
and the evolution process of PLC shear band with time was reproduced. The
results clearly prove an evolution mechanism of type B PLC shear bands,
that is, a PLC shear band first nucleates at one side of specimen, then
transversely runs through the entire specimen section with a certain angle,
finally forms an inhomogeneous deformation bands. The experimental
results show that there exists elastic shrinkage deformation outside the
band during the formation of PLC shear band.
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