Interdiffusion in binary Ni-Re alloys

Autor: Alexander Epishin, B. S. Bokshtein, Alexey O. Rodin, G. Oder, I. L. Svetlov, Thomas Link
Rok vydání: 2015
Předmět:
Zdroj: The Physics of Metals and Metallography. 116:175-181
ISSN: 1555-6190
0031-918X
Popis: Processes of interdiffusion have been studied in the Ni-Re system. The method of electron-microprobe analysis was used to measure the interdiffusion coefficients D in Ni4.4Re/Ni, Ni7Re/Ni Ni9Re/Ni, and Ni9Re/Ni4.4Re (wt %) diffusion pairs in the temperature range of 1050–1350°C. The averaged values of the preexponential factor and the activation energy for interdiffusion were found to be D0 = 1.16 × 10−4 m2/s and Q = 317 kJ/mol, respectively. The value D0 ∼ 10−4 m2/s is typical of substitutional alloying elements in fcc metals; the value of Q is determined to be close to that for W and is significantly higher than those that correspond to other alloying elements in nickel superalloys. No clearly pronounced concentration dependence of the coefficients of interdiffusion has been revealed at a rhenium concentration of 4.4–9 wt %.
Databáze: OpenAIRE
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