%0 Journal Article
%T LENGTH SCALE DEPENDENT DUCTILITY AND FRACTURE BEHAVIOR OF Cu/Nb NANOSTRUCTURED METALLIC MULTILAYERS<br>Cu/Nb纳米金属多层膜延性及断裂行为的尺寸效应
%A ZHANG Xin
%A ZHANG Jinyu
%A LIU Gang
%A ZHANG Guojun
%A SUN Jun State Key Laboratory for Mechanical Behavior of Materials
%A Xi'an Jiaotong University
%A Xi'an
%A <br>张欣
%A 张金钰
%A 刘刚
%A 张国君
%A 孙军
%J 金属学报
%D 2011
%I 
%X By using uniaxial tensile test combining the $in~situ$ electrical resistance change method, the influence of modulation period with a wide range spanning from 10 to 250 nm on the ductility and fracture toughness of Cu/Nb nanostructured metallic multilayers on polyimide substrate was measured. The microstructural analysis revealed that the modulation structure of Cu/Nb metallic multilayers was clear and no intermixing between Cu and Nb was been found by using line scanning analysis. The experimental results indicated that both ductility and fracture toughness of the multilayer film exhibited a nonmonotonic change with decreasing modulation period, and reached maximum values at a critical modulation period of about 50 nm. This was attributed to the competing effect between the size of the microcracks initiated in the Nb layer and the role of the Cu layer in blocking crack propagation. This competing effect was qualitatively assessed on basis of fracture mechanics.
%K nanostructured multilayers
%K modulation period
%K ductility
%K fracture toughness<br>纳米多层膜
%K 调制波长
%K 延性
%K 断裂韧性
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=AB188D3B70B071C57EB64E395D864ECE&jid=B061E1135F1CBDEE96CD96C109FEAD65&aid=8E60E17C653D3D741FBA9A56D1890D65&yid=9377ED8094509821&vid=F4B561950EE1D31A&iid=0B39A22176CE99FB&sid=28F9D9CF04F424FF&eid=1D01216AD76577EC&journal_id=0412-1961&journal_name=金属学报&referenced_num=0&reference_num=0