%0 Journal Article
%T EFFECT OF GRAIN BOUNDARY ON FATIGUE BEHAVIOUR OF Al BICRYSTALS
%A LI Qingsheng
%A Taiyuan University of Technology
%A Taiyuan
%A China TBRETHEAU Laboratory PMTM
%A CNRS
%A University Paris Nord Deptof Mathematics
%A Mechanics
%A Taiyuan University of Technology
%A Taiyuan
%A China
%A <br>T.BRETHEAU
%J 金属学报(英文版)
%D 1990
%I 
%X The effect of grain boundaries on cyclic deformation and fatigue crack growth in aluminum bicrystals has been studied.The effect of a grain boundary is restricted in a narrow area, termed as grain boundary affecting zone(GBAZ),where the incompatible plastic strain treats internal stress which conversely promotes inhomogeneous slip in the area and grain boundary cracking.As an extended stage I crack initiated from a notch approaches the grain boundary under a constant cyclic stress,the crack front branches splits into several pieces, meanwhile,the growth rate of the crack reduces to a minimum value at the center of the GBAZ.Such microstructure-sensitive growth of extended stage I cracks is mainly attributed to the grain boundary-induced crack tip sheilding.
%K compatibility
%K stage I growth
%K crack tip shielding
%K crack tip displacement<br>
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=AB188D3B70B071C57EB64E395D864ECE&jid=C19B08D052F5FD8445F4BB80A1A5D7BF&aid=01B7F711C60EE2EF059E8E0A4A6580A6&yid=8D39DA2CB9F38FD0&vid=38B194292C032A66&iid=B31275AF3241DB2D&sid=9BA67A0B76A3DBA8&eid=E57FE519484CFB70&journal_id=1006-7191&journal_name=金属学报(英文版)&referenced_num=0&reference_num=12