%0 Journal Article
%T Molecular dynamics simulation of the uniaxial tensile deformation of nanocrystalline copper<br>纳米晶铜单向拉伸变形的分子动力学模拟
%A Wen Yuhua Zhou Fuxin Liu Yuewu Zhou Cheng''''en
%A <br>文玉华
%A 周富信
%A 刘日武
%A 周承恩
%J 力学学报
%D 2002
%I 
%X Nanocrystalline (nc) materials are characterized by a typical grain size from 1 to 100 Din. The uniaxial tensile deformation of computer produced nc coppers is simulated by using molecular dynamics with Finnis-Sinclair potential. The mean grain size of simulated nc coppers is varied within the 5.38 to 1.79 urn range. With grain size decreasing, the mean atomic energy of nc systems and interior grain has increased, but that of grain boundaries has descended slowly. The Young's modulus depends strongly on the grain size, and decreases with decreasing grain size. The simulated nc coppers show a reverse Hall-Petch effect. Most of the plastic- deformation is due to grain boundary sliding, grain boundary motion, and grain rotation, and a minor part is caused by dislocation activities in the grains, which are consistent with experimental results. The dislocation activities begin to play a role in the large strain (over 5%); This role is progressively distinct with gram size increasing.
%K nanocrystalline materials
%K mechanical properties
%K molecular dynamics<br>纳米晶体
%K 力学性质
%K 分子动力学
%K 纳米晶铜
%K 单向拉伸变形
%K 材料理论
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=5D344E2AD54D14F8&jid=4100DA4A1A3BA1B0CE5AD99AE1DFB420&aid=18CE69F51687C377&yid=C3ACC247184A22C1&vid=339D79302DF62549&iid=CA4FD0336C81A37A&sid=771469D9D58C34FF&eid=933658645952ED9F&journal_id=0459-1879&journal_name=力学学报&referenced_num=13&reference_num=24