Microwave-induced heating and sintering of metallic glasses

摘要

Metallic glasses exhibit low viscosity in a temperature range between the glass-transition and crystallization temperature which allows successful sintering of glassy powders. Microwave heating being a volumetric heating has significant advantages over conventional heating in materials processing, such as substantial energy savings, rapid heating rates and process cleanness. In the present study, we investigate the stability of the Fe_(73)Si_7B_(17)Nb_3, Fe_(65)Co_(10)Ga_5P_(12)C_4B_4, Ni_(52.5)Zr_(15)Nb_(10)Ti_(15)Pt_(7.5), Ni_(60)Nb_(20)Ti_(15)Zr_5, Zr_(55)Cu_(30)Al_(10)Ni_5 and Ti_(47.5)Zr_(10)Cu_(30)Pd_(7.5)Sn_5 glassy powders and formation of the porous bulk metallic glassy samples by microwave heating in a single-mode cavity with separated electric (E) and magnetic (H) field maxima in an inert atmosphere. The Fe_(73)Si_7B_(17)Nb_3 and Fe_(65)Co_(10)Ga_5P_(12)C_4B_4 alloys crystallized upon MW heating in both E- and H-field maxima forming a nanostructure. The Ni_(52.5)Zr_(15)Nb_(10)Ti_(15)Pt_(7.5) and Zr_(55)Cu_(30)Al_(10)Ni_5 alloys were heated well in H-field and were not heated well enough in E-field. In case of Ni_(52.5)Zr_(15)Nb_(10)Ti_(15)Pt_(7.5) and Ni_(60)Nb_(20)Ti_(15)Zr_5 alloys sintered samples were obtained.