The Thermal Effect Of High-intensity Pulsed Ion Beam Irradiation And Compressed Plasma Flow Irradiation Of Molybdenum(Tungsten) And ZrAlCoCu Metallic Glass

The plasma facing material in the ITER device is exposed to 14 MeV neutron,plasma irradiation environment and undergoing high thermal loads.The strong thermal effect causes melting and vaporization of the surface of the material,changing the surface topography,microstructure and mechanical properties of the material.The high intensity pulsed ion beam and the compressed plasma flow have the characteristics of short pulse strong heat and can simulate the strong thermal load environment of the reactor.In this paper,the metal molybdenum,tungsten and Zr_55.8 Al_19.49.4 Co_17.367.36 Cu_7.44 metallic glass were processed by using high intensity pulsed ion beam and compression plasma flow.The surface morphology and mechanical properties of materials after heat treatment with different treatments and different parameters were studied.It provides reference for seeking good thermal shock resistant structural materials.After HIPIB irradiated molybdenum,cracks and"melting pits"appear on the surface of molybdenum under the energy density of 1.6-2.5 J/cm².X-ray diffraction results show that the compressive stress causes the diffraction peaks of molybdenum to shift to a high Angle.A small amount of Mo2C phase was observed locally by TEM.The ion beam creates stress and a new phase within the material.After HIPIB irradiation,the hardness values of metal materials and Zr-based amorphous materials decrease,and the energy density has a greater influence on the hardness value than the pulse number.The strong thermal effect is the main reason for the decrease of hardness.Irregular fluctuations in the curve within the ion range were observed on the hardness ratio curve.The macroscopic hardness value characterizing the hardness in the ion range was calculated using the Nix-Gao model.It was found that the low hardness density of the material after irradiation was close to or slightly larger than the original sample.The ion beam has an effect on the hardness of the material,but the effect of the thermal effect is stronger,and the hardness value of the material decreases as a whole.After high intensity pulsed ion beam treatment,there is no obvious radiation damage phenomenon such as cracks on the surface of Zr-based amorphous.Hardening within ion range was also observed on the hardening ratio curve and the Nix-Gao model.Local hardening will occur in the near-surface layer due to ion implantation,but the influence of annealing effect is far greater than that of ion beam,and the hardness value of the material after HIPIB treatment decreases as a whole.After the treatment of the compressed plasma flow,the surface of tungsten and molybdenum appear melting and formed a wavy shape.Internal stress is released on the metal surface by means of cracks.After CPF treatment,the diffraction peaks of tungsten and molybdenum shift to a higher angle,and when the energy density is 25J/cm²,the preferred orientation of crystal orientation can be observed in metal molybdenum.The annealing effect of compressed plasma flow treatment leads to the decrease of hardness.The surface layer of HIPIB will harden due to ion implantation.After CPF treatment,the material surface melts and the size effect increases.After the strong heat treatment,the annealing effect is more profound,the hardness of molybdenum,tungsten and Zr-based amorphous decrease a little.