收稿日期: 2003-08-21
网络出版日期: 2004-03-19
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)
张哲峰 , 王中光 , 师昌绪 . 沿晶界疲劳开裂机理(英文)[J]. 中国科学院大学学报, 2004 , 21(2) : 270 -275 . DOI: 10.7523/j.issn.2095-6134.2004.2.019
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.
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