| Autor: |
Bodrova, L. E., Mel'chakov, S. Yu., Goida, E. Yu., Gulyaeva, R. I., Shubin, A. B. |
| Zdroj: |
Russian Metallurgy (Metally); Jan2022, Vol. 2022 Issue 1, p19-28, 10p |
| Abstrakt: |
An express method to activate the formation and decomposition of (Cr,W) solid solutions, which is based on copper melt infiltration into noncompacted mixtures of chromium and tungsten powders under low-frequency vibration, is used to form disperse structures in Cr–W–Cu alloys. Model composite alloys are fabricated at 1300–1450°C. Their macro- and microstructure and elemental composition are investigated. A short time of mixing of powders before infiltration results in microcomposites (MC) with compositions varying over a wide range in a copper matrix: the Cr/W ratio (at %) in them is 0.2–7.2 and the Cu content is 1–31 at %. The copper content in MCs is found to depend exponentially on the Cr/W ratio. The microstructure of MCs consists of (Cr,W) solid solutions and/or disperse products of their decomposition in α-Cu. Secondary globular tungsten forms below the binodal line and lamellar tungsten forms above it in an (Cr,W) matrix during low-frequency vibration. The degree of dispersion of globular tungsten increases when the copper content decreases and the chromium content increases in MCs. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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