Crystallization Behavior of Al-Ni-Y Amorphous Alloys

• Journal title : Applied Microscopy
• Volume 43, Issue 3,  2013, pp.127-131
• Publisher : Korean Society of Electron Microscopy
• DOI : 10.9729/AM.2013.43.3.127
Title & Authors
Crystallization Behavior of Al-Ni-Y Amorphous Alloys
Na, Min Young; Kim, Kang Cheol; Kim, Won Tae; Kim, Do Hyang;

Abstract
The crystallization behavior in the $\small{Al_{87}Ni_3Y_{10}}$ and $\small{Al_{88}Ni_3Y_9}$amorphous alloys has been investigated. As-quenched $\small{Al_{87}Ni_3Y_{10}}$ amorphous phase decomposes by simultaneous formation of Al and intermetallic phase at the first crystallization step, while as-quenched $\small{Al_{88}Ni_3Y_9}$ amorphous phase decomposes by forming Al nanocrystals in the amorphous matrix. The density of Al nanocrystals is extremely high and the size distribution is homogeneous. Such a microstructure can result from rapid explosion of the nucleation event in the amorphous matrix or growth of the preexisting nuclei embedded in the as-quenched amorphous matrix. The final equilibrium crystalline phases and their distribution at 873 K are exactly same in both $\small{Al_{87}Ni_3Y_{10}}$ and $\small{Al_{88}Ni_3Y_}$$\small{9}$ alloys.
Keywords
Amorphous alloy;Crystallization;
Language
English
Cited by
1.
Thermodynamic Optimisation of the Ni-Al-Y Ternary System, Journal of Phase Equilibria and Diffusion, 2015, 36, 4, 357
References
1.
Allen D, Foley J, and Perepezko J (1998) Nanocrystal development during primary crystallization of amorphous alloys. Acta Mater. 46, 431-440.

2.
Battezzati L, Kusy M, Rizzi P, and Ronto V (2004) Devitrification of Al-Ni-Rare earth amorphous alloys. J. Mater. Sci. 39, 3927-3934.

3.
Inoue A (1998) Amorphous, nanoquasicrystalline and nanocrystalline alloys in Al-based systems. Prog. Mater. Sci. 43, 365-520.

4.
Inoue A, Ohtera K, Tsai A-P, and Masumoto T (1988) Aluminum-based amorphous alloys with tensile strength above 980 MPa (100 \$kg/mm^2\$). Jpn. J. Appl. Phys. 27, L479-L482.

5.
Sahoo K, Wollgarten M, Kim K, and Banhart J (2005) Crystallization behavior and microhardness evolution in Al92-xNi8Lax amorphous alloys. J. Mater. Res. 20, 2927-2933.