Nucleation of He bubbles in amorphous FeBSi alloy irradiated with He ions

Abstract

It is interesting to investigate the formation of He bubbles in amorphous alloys because point defects do not exist in amorphous materials. In the present study, the microstructural evolution of amorphous Fe 79 B 16 Si 5 alloy, either irradiated with 5 keV He þ ions or implanted with 150 eV He þ ions without causing displacement damage, and then annealed at a high temperature, was investigated using transmission electron microscopy (TEM). Vacancy-type defects were formed in the amorphous alloy after irradiation with 5 keV He þ ions, and He bubbles formed during annealing the irradiated samples at high temperature. On the other hand, for samples implanted with 150 eV He þ ions, although He atoms are also trapped in the free volume, no He bubbles were observed during annealing the samples even up to 873 K. In conclusion, the formation of He bubbles is related to the formation and migration of vacancy-type defects even in amorphous alloys.

Resistance to He2+ irradiation damage in metallic glass Fe80Si7.43B12.57

“…Meanwhile, observed from high-resolution images, there were brighter white dots in Fe-based metallic glass within the He 2+ ions range, and the number of white dots at the end of the range was more than those near the surface and in the ions trajectory. These bright dots seem to be tiny helium bubbles [36]. Helium is an inert gas, and is substantially insoluble in metallic materials.…”

Resistance to He2+ irradiation damage in metallic glass Ta38Ni62

“…3b shows. Different depths of Ta 38 Ni 62 after He 2+ ion beam irradiation maintain a good amorphous state, and no crystals were generated [29]. It can be seen from the TEM cross-sectional image in Fig.…”

Damage Characteristics of Zr-Based Metallic Glasses under Helium Ions Irradiation

“…Wang than the metallic tungsten [13][14][15]. Xu et al studied the microstructural evolution of amorphous Fe 79 B 16 Si 5 alloy irradiated with 5 keV or 150 eV He + ions, and pointed that the formation of helium bubbles is related to the formation and migration of vacancy-type defects even in amorphous alloys [16]. Obviously, much more work, concerning different ion energies, fluences and alloy systems should be done to further understanding the damage feature and underlying mechanism of He ion irradiated BMGs.…”