Interdiffusion in systems with components with differing melting points

Autor: A. Y. Shinyaev
Rok vydání: 1994
Předmět:
Zdroj: Metal Science and Heat Treatment. 36:404-406
ISSN: 1573-8973
0026-0673
Popis: In the development of high-temperature alloys the use of refractory metals with a high melting point — Ta and W — for alloying is becoming conventional. These metals, and also the alloys based on them, may come into contact with metals and alloys whose melting points are much lower (for example, in composite-type materials). Upon heating there develop in the areas of contact of the metals differing in their melting point the processes of mutual diffusion, knowledge of which makes it possible to determine the chemical composition of the transition zone and the thermal stability of the composite material. Since production of the refractory metals involves great difficulties, intermediate products are prepared from them by the powder metallurgy method. The powder materials contain more defects, particularly pores, in comparison with the cast materials, which must be considered in studying the diffusion. In the present article we examine on the basis of experimental data and thermodynamic analysis the characteristics of the kinetics of the process of mutual diffusion of vanadium and the refractory metals in cast and powder variants at various temperatures.
Databáze: OpenAIRE
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