Increasing the hardness and wear resistance of powder alloys coatings through use ultrafine-grained powders metastable phases is a promising way in metallurgy. This paper presents results studies process obtaining ultrafine by electric discharge erosion cemented carbide waste WC-5TiC-10Co on special installation. An empirical model that describes dependence productivity energy properties liquid...

Four V-Ta-4Cr-4Ti quaternary alloys containing different quantities of Ta were investigated to determine the effect content on Charpy impact properties. Five button-shaped ingots V-4Cr-4Ti ternary alloy and V-xTa-4Cr-4Ti (x = 3, 9, 15, 22 wt.%) fabricated a laboratory scale by using non-consumable arc-melting in an argon atmosphere. tests conducted at temperatures ranging from 77 K 293 instrume...

Two new groups of cholane-peptoid hybrid macrocycles were produced by implementing novel combinations of the MiB methodology. Steroid-based hybrid macrolactams including heterocycle and aryl moieties were obtained by utilizing cholanic dicarboxylic acids and diamines in a bidirectional double Ugi-Four-Component (Ugi-4CR) based macrocyclization protocol. Alternatively, N-substituted cyclocholami...

The direct nonpeptidic macrocycle synthesis of α-isocyano-ω-amines via the classical Ugi four-component reaction (U-4CR) is introduced. Herein an efficient and flexible two-step procedure to complex macrocycles is reported. In the first step, the reaction between unprotected diamines and isocyanocarboxylic acids gives high diversity of unprecedented building blocks in high yield. In the next st...

Various V-Ta-4Cr-4Ti quaternary alloys containing different amounts of Ta were investigated to determine the effect concentration on their tensile properties. Six button-shaped ingots V-xTa-4Cr-4Ti (x = 4, 8, 15, 22, 24, and 35 wt.%) fabricated a laboratory scale by using non-consumable arc-melting in argon atmosphere. The sheet specimens for all examined herein obtained cold-rolling; hot-rolli...

Surface scratch has significant influence on the fatigue behavior of Ti-5Al-2Zr-4Mo-4Cr. In this paper, test with three different surface roughness are conducted, results recorded, including data and fracture characteristics. The distribution is analyzed characteristics discussed according to change roughness. Study Ti-5Al-2Zr-4Mo-4Cr intheoretical engineering study.