During the landslipping of grain boundary,the experiments show,there is a very high sheering strain of the grain boundary.

The experimental results show that strain rate doesn't affect the fracture mechanism of intragranular dimple and mainly dislocation slipping;the tensile strength is increased slightly along with the increase of strain rate,however,the elongation doesn't decrease in general which is decreased firstly and raised later with the increase of strain rate,the high s.

Through the analyses of the X-ray diffraction data and the corresponding crystallography, it was found that during the first pass of ECAP, the main deformation mode of α phase is {1011}(1012} twinning, while during the following passes the main deformation mode is dislocation slip.

Twinning and dislocation slip have been proven to be the dominant model of plastic deformation when the temperature is bel.

In the process of superplastic deformation, the dislocation sliding has important cordinating effect, so that the grain boundary sliding proceeds easily.

It is of no significance that gold is transported from the inside of pyrite in which gold atoms diffuse via defects such as dislocations if there is no dislocation sliding in the pyrite.

Future seismic activities or abrupt strike-slip movement of the EKF will cause serious engineering-geological problems to the Qinghai-Tibet Railway.

Thennumeric simulation about strike-slip movement of the seismic faults resulting in destructive effectof Qinghai-Xizang railway is brou.

25, respectively, GBS and dislocation creep appeared to dominate the deformation process, consistent with the SEM examination.