%0 Journal Article
%T EFFECT OF GRAIN BOUNDARY ON FATIGUE BEHAVIOUR OF Al BICRYSTALS<br>Al双晶体的晶界疲劳效应
%A LI Qingsheng
%A <br>李庆生
%A T.BRETHEAU
%J 金属学报
%D 1990
%I 
%X The effect of grain boundaries on cyclic deformation and fatiguecrack growth in Al bicrystals under stress controlling in laboratory atmospherehas been studied. The effect of a grain boundary is found to be restricted in anarrow area, termed as grain boundary affecting zone (GBAZ), where the incom-patible plastic strain by the two sides of the interface under cyclic loads creats in-ternal stress which conversely promotes inhomogeneous slip in the area and grainboundary cracking. As an extended stage I crack initiated from a notch approachesthe grain boundary under a constant cyclic load, the crack branches, the crackfront splits into several pieces, meanwhile, the growth rate reduces to a minimumvalue at the centre of GBAZ. Such microstructure-sensitive growth of extendedstage I cracks is mainly attributed to the grain boundary-induced crack tip shielding.
%K compatibity
%K growth stage I
%K crack tip shielding
%K crack tip displacement<br>Al
%K 晶体
%K 晶界
%K 疲劳效应
%K 双晶体
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=AB188D3B70B071C57EB64E395D864ECE&jid=B061E1135F1CBDEE96CD96C109FEAD65&aid=1EC118E3EDC58D277CB93DE692C1AEA0&yid=8D39DA2CB9F38FD0&vid=96C778EE049EE47D&iid=38B194292C032A66&sid=E514EE58E0E50ECF&eid=BFE7933E5EEA150D&journal_id=0412-1961&journal_name=金属学报&referenced_num=1&reference_num=1