Interfacial reaction during the fabrication of Ni60Nb40 metallic glass particles-reinforced Al based MMCs

Authors

P. Yu, Technische Universitat Darmstadt
L. C. Zhang, Technische Universitat DarmstadtFollow
W. Y. Zhang, Technische Universitat Darmstadt
J. Das, Technische Universitat Darmstadt
K. B. Kim, Technische Universitat Darmstadt
J. Eckert, Technische Universitat Darmstadt

RIS ID

26800

Publication Details

Yu, P., Zhang, L. C., Zhang, W. Y., Das, J., Kim, K. B. & Eckert, J. (2007). Interfacial reaction during the fabrication of Ni60Nb40 metallic glass particles-reinforced Al based MMCs. Materials Science and Engineering A: Structural Materials Properties Microstructure and Processing, 444 (1-2), 206-213.

Abstract

Ni₆₀Nb₄₀ metallic glass powders were prepared by mechanical alloying and subsequently combined with Al to form an Al–30 wt.% Ni₆₀Nb₄₀ metal matrix composite (MMC). The crystallization of the Ni₆₀Nb₄₀ metallic glass reinforcements and their reaction with the Al matrix during preparation of the MMC were investigated in a differential scanning calorimeter (DSC) upon isothermal annealing. The comparison of the DSC curves of the Ni₆₀Nb₄₀ metallic glass and of the Al–30 wt.% Ni₆₀Nb₄₀ composite shows that the amorphous Ni₆₀Nb₄₀ particles have a very strong resistance against reaction with Al but reaction occurs after crystallization of the metallic glass. The analysis of the isothermal annealing DSC curves gives an activation energy of crystallization of the Ni₆₀Nb₄₀ metallic glass of 724 kJ/mol. The interfacial reaction between Al and the Ni₆₀Nb₄₀ reinforcements is mainly controlled by diffusion. X-ray diffraction (XRD) and scanning electron microscopy (SEM) results indicate that during the interfacial reaction, Ni diffuses from the Ni₆₀Nb₄₀ particles to react with Al and form Al₃Ni. At the same time, Al diffuses into the reinforcement particles to react with remaining Nb and form Al₃Nb.