Laser welding seams in titanium alloys with complex structure were detected by using real time imaging system in this paper,and the images of ray detection which contain tiny flaws were obtained.

X-ray real time imaging method was adopted to nonde-structively test the complex structure welding parts of titanium alloys, the spatial position of tiny flaws was determined based on the line profile distribution of flaws position, and a formula which could calculate the burial depth of flaws was obtained.

The initial imperfections criteria is used in the nonlinear finite element analysis,and the initial minute imperfect method is put forward to research the disturbance strategy of nonlinear bifurcation buckling.

Microdefects in binary TiAl alloys with different chemical compositions investigated by positron annihilation technique;

Effects of Zr on the Microdefects and Electronic State in Ni-Al Intermetallic Compounds;

Study of species characteristic and formation of microdefects in thermite welded joints in rails was described.

Microdefects in nanocrystalline carbon;

Change in Microdefects and Electron Density of Cuprate Superconductor with Temperatures;

Positron annihilation of microdefects and 3d electrons in Zn-40Al alloy

In the purpose of inspecting small defects in P/M superalloy of large thickness,multizone ultrasonic inspection technique was applied.

Study of the micro defects of DGJW40 steel bonded WC carbide made by a new process showed that this process was better than the existing compacting sintering methods in respect of the alloy's compactness,hole cleanliness,free carbon content and segregation of hard phase in the alloy.