NANOMECHANICS ON GRAIN BOUNDARY MEDIATED PLASTICITY IN NANOCRYSTALLINE MATERIAL

摘要：

In general,the plastic behavior of crystalline materials is mainly controlled by the nucleation and motion of lattice dislocations 1.We used in situ dynamic transmission electron microscopy to observe nanocrystalline nickel with an average grain size of about 10 nanometers,which shows deformation-induced grain agglomeration 2.It has been found that grain boundary mediated processes have become a prominent deformation mode.Additionally,trapped lattice dislocations are observed in individual grains following deformation.This change in the detbrmation mode arises from the grain-size dependent competition between the deformation controlled by nucleation and motion of dislocations and the deformation controlled by diffusion assisted grain boundary processes.

作者: Xingyuan (Scott) Mao Zhiwei Shan

作者单位: Department of Mechanical Engineering and Materials Science,University of Pittsburgh,Pittsburgh,PA 15261,USA

会议类型: 国际会议

会议名称: 第二届国际非均质材料力学会议(The Second International Conference on Heterogeneous Material Mechanics)

会议地点: 安徽黄山

会议语种:英文

页码: 78

在线出版日期: 2008-06-03（万方平台首次上网日期，不代表论文的发表时间）