Consolidation of Amorphous Al86Ni6Co2Gd6 Melt-Spun Ribbons by Twist Extrusion

Abstract:

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Amorphous Al86Ni6Co2Gd6 ribbons produced by melt-spinning processing were consolidated using twist extrusion (TE). Electrical resistance measurements showed that under continuous heating at 5 K/min crystallization begins at 473 K by formation of Al-nanocrystals and ends at 673 K by formation of equilibrium intermetallics. From one to five TE extrusion passes were conducted in several experiments at temperatures 458-573 K and applied pressures ranged between 1150-1700 MPa. The fully dense billets with dimensions 14×23×40 mm3 were produced at extrusion temperatures ≥ 523 K. The maximum microhardness (550 kgf/mm2) was reached for the bulk materials consolidated at 523 K with a nanocomposite structure consisted of Al-nanocrystals with size about 13 nm embedded in amorphous matrix. The billet compacted at 573 K has a fully crystallized structure and lower microhardness (380 kgf/mm2).

Info:

Periodical:

Materials Science Forum (Volumes 503-504)

Edited by:

Zenji Horita

Pages:

699-704

DOI:

10.4028/www.scientific.net/MSF.503-504.699

Citation:

V. Varyukhin et al., "Consolidation of Amorphous Al86Ni6Co2Gd6 Melt-Spun Ribbons by Twist Extrusion", Materials Science Forum, Vols. 503-504, pp. 699-704, 2006

Online since:

January 2006

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Price:

$35.00

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