Study Of Zr-based Metallic Glass And W Metal With High Intensity Pulsed Ion Beam Irradiation

Irradiation damage problem of plasma facing materials is one of the most urgent problems in the fusion device. Irradiation effect of fusion device including strong thermal radiation and fusion plasma irradiation, etc. High intensity pulsed ion beam has the characteristics of instantaneous, high fever, thus it can be used for simulation of fusion device of plasma instability caused by the transient heat load of the environment and test materials irradiation resistance performance. In this paper, based on high intensity pulsed ion beam simulating transient heat load in the fusion device environment, irradiation processing for Zr55Al10Cu30Ni5, Zr53Al23.5Cu5.9Co176metallic glass and tungsten metal, under different parameters of high intensity pulsed ion beam irradiation research of amorphous materials and the structure and properties of crystal material, looking for excellent irradiation resistance of materials to provide the reference.In this paper, the high intensity pulsed ion beam was mainly composed of Cn+(70%) and H+(30%) at an acceleration voltage of250kV under different energy densities (0.25J·cm-2、0.7J·cm-2、1.4J·cm-2,2.0J·cm-2) for different number of pulses (3times,10times,100times,300times), by using X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscopy (TEM) and nanoindentation tester are used for to analyze the different parameters of high intensity pulsed ion beam irradiation after metallic glass and tungsten metal microstructure, surface morphology and the change rules of mechanical properties.The results show that:Both kinds of Zr-based metallic glass has a good stability of amorphous and remain amorphous as the main structure under different parameters of high intensity pulsed ion beam irradiation. A small amount of nanocrystalline Zr2Ni-type phase (face centered cubic) appeared only at300-time irradiation on the surface of Zr55Al10Cu30Ni5metallic glass. W metal also has the stable phase structure. Different parameters of the high intensity pulsed ion beam irradiation were not obvious phase transformation.High intensity pulsed ion beam irradiation in the accumulation of stress of the internal defects of material, the defects of metal tungsten mainly in grain boundary, when the energy density of0.25J·cm-2to meet or exceed the100times, number of pulses, the accumulation of stress inside the metal tungsten grain boundary by releasing the surface crack; When the times of irradiation for3times, the energy density reach or exceed1.4J·cm-2, tungsten metal surface due to the severe stress release in the irradiation damage such as cracks and falls off phenomenon. Compared with the same parameters under two kinds of Zr-based metallic glass surface does not appear similar irradiation damage phenomenon, mainly because the metallic glass is amorphous structure, there are many interstice, its internal and evenly distributed in each direction, the interstice of accumulated during irradiation stress play very good buffer role.After irradiation of metal glass and tungsten metal, due to strong thermal effect, the nano hardness decreases with the increase of the energy density and number of pulses.Two kinds of Zr-based metallic glass (which is used in this experiment) has a better resistance than tungsten metal under high intensity pulsed ion beam irradiation. Metal glass has the very good application prospect in the fusion device of plasma facing materials and space plasma environment.