| Autor: |
Maria Zhadko, Anatoly Zubkov |
| Rok vydání: |
2020 |
| Předmět: |
|
| Zdroj: |
Lecture Notes in Mechanical Engineering ISBN: 9783030407230 |
| Popis: |
The structure and strength properties of vacuum condensate foils of Cu-Mo system obtained by electron beam evaporation have been investigated. It has been shown that alloying of copper vapor flow with molybdenum makes it possible to reduce the grain size of the matrix metal (copper) from 3 μm to 100 nm as a result of the blocking action of molybdenum atoms adsorbed on the surface of growing copper grains during the formation of condensate. On the basis of experimental results methods for calculating the concentrations of alloying element which is necessary to obtain a given dimension of the grain structure of the matrix metal have been proposed. It has been found that the main contribution to the level of strength properties is made by grain boundary hardening both by reducing the grain size, and by increasing the Hall-Petch coefficient. The experimental results are explained by the monolayer character of grain-boundary segregation formed by the Langmuir-Macklin mechanism during the condensation of a two-component vapor consisting of copper and molybdenum atoms on non-orienting substrates in a vacuum. Suchstate of adsorption layers suggests strong interatomic bonds between the molybdenum and copper atoms, which increase the cohesive strength of grain boundaries. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
