Journal of University of Chinese Academy of Sciences >
Intergranular Fatigue Cracking Mechanisms
Received date: 2003-08-21
Online published: 2004-03-19
Supported by
support ed by National Natural Science Funding of China (NSFC19392300-4 and 59701006)
Intergranular fat igue cracking mechanisms of copper crystals containing various grain boundaries(GBs) were investigated by electron channeling contrast(ECC) technique in scanning electron microscope(SEM). Evidence by direct observations indicates that fatigue cracking always nucleated along var-ious random large-angle GBs due to impingement of persistent slipbands (PSBs) and pile-up of dislocations.However, low-angle GBs do not produce fatigue cracks because the dislocations can be transferred through the GBs by PSBs. It is suggested that intergranular fatigue cracking strongly depends on the interaction mode of PSBs with GBs, while the GB structure itself plays a much less role.
ZHANG Zhe-Feng , WANG Zhong-Guang , SHI Chang-Xu . Intergranular Fatigue Cracking Mechanisms[J]. Journal of University of Chinese Academy of Sciences, 2004 , 21(2) : 270 -275 . DOI: 10.7523/j.issn.2095-6134.2004.2.019
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