The Influence of Copper Condensates Alloying with Co, Mo, Ta Transition Metals on the Structure and the Hall-Petch Dependence

Abstract

The structure and strength properties of two-component copper-based Cu-Co, Cu-Mo and Cu-Ta vacuum condensates are investigated. It is shown that cobalt, molybdenum and tantalum disperse the grain structure of the copper matrix to submicron and nanometer dimension, form supersaturated solid solutions in the copper fcc lattice and heterophase structures. A decrease in grain size of condensates is explained by the formation of adsorption layers by the atoms of doping elements on the surface of the copper matrix metal growing grains. The Hall-Petch dependences for the yield strength are built. The dependences for Cu-Mo and Cu-Ta condensates have greater slope than a similar function for the single-component copper. The observed effect is explained by the influence of monolayer grain boundary segregation of molybdenum and tantalum atoms and multilayer segregation of Co atoms.

Structure, Strength and Conductive Properties of Vacuum Cu-Ta Condensates CuTa

“…At a higher concentration of tantalum, a supersaturated solution forms in the copper lattice and the formation of particles of the second phase in the volume of the copper matrix takes place. A similar phenomenon was observed in two-component Cu-Mo, Cu-Co [6], Fe-W [7], Al-Fe [9] condensates. Fig.…”

“…First, the increase in strength properties is due to the reduction in the grain size of the copper matrix, secondly, due to the increase in the Hall-Petch coefficient (Fig. 7) [6].…”

“…It should be noted that most of the research is devoted to materials that are obtained by powder methods [2 3, 5]. There is practically no information about the strength and electrophysical properties of films, foils and coatings obtained by vacuum-plasma technologies and the relationship of these properties with the structure [6,7]. In this connection, the aim of this paper was to study the structure, strength and electrical conductivity of Cu-Ta condensates foils obtained by evaporation-condensation of constituent components in a vacuum (PVD technology).…”

Determination of influence of electrolyte composition and impurities on the content of -AL2O3 phase in MАO-coatings on aluminum

“…In most technologies, such a modification leads to a decrease in the grain size of crystallites to a nanometer size [7,8]. To increase the stability of such metastable states, two approaches are used: doping to low concentrations (up to 1 at %) [9,10] and multi-element doping in a ratio of elements close to equiatomic [11,12]. Moreover, the highest mechanical properties were achieved by obtaining plasma flows on the surface of coatings [13,14].…”

Structural Engineering and Mechanical Properties of (Ti-V-Zr-Nb-Hf-Ta)N Coatings Obtained at Different Pressures

“…Therefore, various methods of surface modification are being developed in order to achieve high hardness, low friction coefficient, high resistance to oxidation and wear [3,4]. The most effective method of achieving high functional properties is ion-plasma deposition of special coatings [5] or the creation of structural nanocrystalline states with a strengthened boundary (due to doping with special elements [6]).…”