Effect of solidification conditions on the formation and structures of long period stacking structures in the Mg-Zn-Y alloys;

Formation of long period stacking structures in Mg-Gd-Y-Zn alloy studied by in-situ quasi-dynamic back-scattering electron microscopy;

The characteristics of long period stacking structures(LPS)formed in these alloys were studied by TEM and SEM.

The mechanic property,microstructures,formation mechanics and deform behavior of magnesium alloy with novel long-period stacking order structure are described in detail.

For revealing the influence of the reductivity on macerals stacking structure,X-ray diffraction(XRD)was carried out to study the stacking structure characteristics of the vitrinite and inertinite from Pingshuo and Shendong coals with similar coal rank and petrographical composition but different reductivity.

Especially,in long period structures,displacement is mainly controlled by transient vibration.

In the light of being short of broadband strong seismic records in aseismic design of long period structures at present, using reflectance, contour integral and other methods of synthetic earthquake ground motion, the character of long period for earthquake ground motion is approached.

The simulation results also indicate that the destruction or collapse of long period structure does not happen at the appearing instant of the greatest intensity of earthquake ground motion,but frequently at the final stage of earthquake ground motion,or even after the earthquake ground motion completely ends,which can provide scientific basis for the structure design and safety.