International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

The physic-technological basis for fabrication of bulk rods and plates of amorphous, amorphous-nanocrystalline and 100% nanocrystalline alloys at melt cooling rates from 80 to 3200 K/s with crystal sizes from 10 to 50 nm has been developed. The multiphase structure formed in the initial bulk samples, as well as in the process of nanocrystallization of amorphous ribbons, is characterized by record microhardness values of 17-22 GPa. Amorphous powders (20-100 μm) of Fe55Ni8Co6Mo4Cr2V1Al2P9C6B5Si2 and Fe61.37Co6.84Cr3.78V0.85W0.82Mo1.06Nb0.85B19.87C1.99Si2.57 alloys are used to create a wear-resistant coating on structural stainless steels and low-carbon St3 by the gas-thermal “cold” method » sputtering and subsequent melting of the applied layer.The values of microhardness (Hμ) of nano-coatings significantly exceed the microhardness of all known tool steels. Examples of technology transfer and practical using of developed amorphous and nanocrystalline alloys are presented.

The melt spinning and ball-milling techniques were applied to fabricate powder Al-Si-Ni alloy. The obtained Al-Si-Ni powder was compacted in pellet and solid-state sintered at 530 °C at a pressure of ~200 MPa. The phase composition, structure, coefficient of linear thermal expansion and hardness sintered samples were determined. The coefficient of linear thermal expansion of samples formed after sintering is in the range from 14.7×10-6 K-1 to 17.5×10-6 K-1. It is typical for steel. The synthesized powder composite, contains intermetallic Al3Ni phase, crystalline aluminum, and silicon. The hardness of sintering samples is 113 HV.