On The Metallic Materials With Ti-matrix Irradiated By High-Intensity Pulsed Ion Beams

Due to the characteristics of high power density,high efficiency and subsequent thermal-mechanical effects onto the materials,the high-intensity pulsed ion beams (HIPIB) technique is currently attracting considerable attention in surface engineering. This work deals first with the structure and mechanism of the TEMP-II type HIPIB apparatus. The HIPIB apparatus mainly consists of Marx generator,double coaxial type pulse-forming line (PFL),self-magnetic field magnetically isolated diode (MID),vacuum system and target unit. The plasma for formation of HIPIB in the MID with bipolar-mode is generated by explosive electron emission. The typical parameters for HIPIB into metallic materials are an ion energy of 250-300 keV,a current density of 40-300 A/cm2,and a beam spot size of 10-100 cm2.To understand the interaction mechanism between HIPIB and surface of materials,the experimental results of HIPIB irradiation on pure Ti,Ti6Al4V alloy,and y-TiAl intermetallics are presented based on analyses by AFM,XRD. micro-hardness measurements,and electrochemical technology. The .pure Ti irradiated by HIPIB showed that crater are formed on the surface under all the irradiation parameters. The incident angle of HIPIB has a significant effect on surface topography with less irradiation numbers. When shot numbers increase,shot numbers plays an important role in surface topography. The irradiated Ti6Al4V alloy possessed improved corrosion resistance in 1 mol/1 HC1 solution on the micro-hardness increased surfaces. The irradiated y-TiAl intermetallics indicated apparent changes in the phase structure and topography on the ablated surfaces under all the irradiation parameters.On the basis of characteristics of HIPIB,a numerical model was built from short-pulsed rapid heating processes. The temperature field was calculated for the metallic materials irradiated by HIPIB. The interfaces kinetic relation is explained in consideration of their non-equilibrium phenomena. The calculated results reveal that non-uniform explosion is possible interaction mechanism between HIPIB and metallic materials.