%0 Journal Article
%T DAMPING BEHAVIOR OF ULTRAFINE-GRAINED PURE ALUMINUM L2 AND THE DAMPING MECHANISM
%A ZM Zhang
%A CJ Xu
%A JC Wang
%A HZ Liu
%A <br>Z.M. Zhang
%A C.J. Xu
%A J.C. Wang and H.Z. Liu School of Materials Science & Engineering
%A Xi''''an University of Technology
%A Xi''''an
%A China State Key Laboratory of Solidification Processing
%A Northwestern Polytechnical University
%A Xi''''an
%A China
%J 金属学报(英文版)
%D 2006
%I 
%X Ultrafine-grained pure aluminum L2 with a mean grain size of 1.0μm was produced by equal channel angular pressing (ECAP) and annealing at 150℃ for 2h. Damping behavior of the alloy was measured using a dynamic mechanical thermal analyzer. The alloy had an excellent damping capacity Q-1 with the ambient value being 9.8×10-3 at 1.0Hz when the strain amplitude was 2.0×10-3. The damping behavior of the alloy showed a non-linear damping variation tendency, that is, with an increase in temperature and a decrease of frequency, the damping capacity of the alloy increased. The damping capacity increased with the strain amplitude when the strain amplitude was less than 4.6×10-5. When the strain amplitude was higher than 4.6×10-5, the damping capacity became a constant and independent of strain amplitude. The high damping capacity was attributed to dislocation unpinning and a drag of dislocation on pinning points.
%K ECAP
%K ultrafine grain
%K damping capacity
%K aluminum alloy<br>ECAP
%K 等通道角挤压
%K 吸震能力
%K 铝合金
%K 阻尼机制
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=AB188D3B70B071C57EB64E395D864ECE&jid=C19B08D052F5FD8445F4BB80A1A5D7BF&aid=CEC225AB18E6ED92B4FA581F29E75B68&yid=37904DC365DD7266&vid=2A8D03AD8076A2E3&iid=38B194292C032A66&sid=E089FDF3CDAE8561&eid=0DEB7A8A66C33AAD&journal_id=1006-7191&journal_name=金属学报(英文版)&referenced_num=0&reference_num=14