%0 Journal Article
%T Grain Boundary Triple Junction Effects on the Fatigue Deformation and Cracking Behaviors of Copper Tricrystal and Tetracrystals
%A Weiping JIA
%A Zhiyong ZHU
%A Zhongguang WANG
%A Shouxin LI
%A <br>Weiping JIA and Zhiyong ZHUState Key Laboratory for Corrosion and Protection of Metals
%A Institute of Metal research
%A CAS
%A Shenyang
%A ChinaZhongguang WANG and Shouxin LIState Key Laboratory for Fatigue and Fracture of Materials
%A Institute of Metal Re
%J 材料科学技术学报
%D 2002
%I 
%X Cyclic symmetrical tension-compression fatigue tests in an axial plastic strain range of 2.0× 10-4 to 1.5× 10-3 were performed on three copper tetracrystal specimens containing two grain boundary triple lines as well as one copper tricrystal specimen employing a multiple step method. Experimental results show that the strengthening effect of triple junction (T J) on axial saturation stress increased with increasing plastic strain amplitude. The strengthening effects owe much to the strain incompatibilities at T J. The cyclic stress-strain (CSS) curves of tetracrystals are higher than that of tricrystal. At Iow strain amplitude, deformation at TJ is smaller than that near grain boundary (GB), which results in that the width of TJ effect zone is smaller than that near GB. Whether GB split or not is associated with the angle between GB and loading axis, activation of slip systems beside GB and the accommodation and annihilation of residual dislocations on GB planes.
%K Grain boundary
%K Triple junction
%K Cracking
%K Copper tricrystal
%K Tetracrystal<br>铜晶体
%K 晶界
%K 三维晶体
%K 断裂行为
%K 四倍晶体
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=84529CA2B2E519AC&jid=324DC3CAB22330DB19158AE0A9B7BFA5&aid=34FEF98F5BF1CAB793B30A53518BF01C&yid=C3ACC247184A22C1&vid=13553B2D12F347E8&iid=0B39A22176CE99FB&sid=6270DC1B5693DDAF&eid=4BB057F167CF3A60&journal_id=1005-0302&journal_name=材料科学技术学报&referenced_num=0&reference_num=0