摘要
We report the mechanical spectroscopy study of the cold-rolling induced dynamical behavior of crystalline defects in nanocrystalline (NC) nickel The results show that internal friction (IF) peaks in NC nickel can be induced by cold-rolling.An IF peak,originating from dislocation activity,occurs when the strain is in the range of 9.7- 32.8%.Two Bordoni peaks occur when the strain is 39.0% and an IF peak associated with deformation twinning appears when the strain is 42.6%.These results mean that deformation of NC nickel is mediated by different kinds of defects as the strain increases.
作者
LI Ping-Yun
ZHANG Xi-Yan
NI Hai-Tao
CAO Zhen-Hua
MENG Xiang-Kang
李平云;张喜燕;倪海涛;操振华;孟祥康(Department of Materials Science and Engineering,National Laboratory of Solid State Microstructures,Nanjing University,Nanjing 210093;School of Materials Science and Engineering,Chongqing University,Chongqing 400030)
基金
Supported by the PAPD(9114021305)
the Fundamental Research Funds for the Central Universities of China(1112021302,CDJXS11132225)
the National Natural Science Foundation of China(50831004,51001060,11004098,51171078)
the National Basic Research Program of China(2010CB631004).
