| Autor: |
Alexandr Synkov, Yan Beygelzimer, V.A. Mashira, V.I. Krysov, V.V. Maslov, V.K. Nosenko, V.I. Tkatch, Viktor Varyukhin, Sergey Synkov, S.G. Rassolov |
| Rok vydání: |
2006 |
| Předmět: |
|
| Zdroj: |
Materials Science Forum. :699-704 |
| ISSN: |
1662-9752 |
| DOI: |
10.4028/www.scientific.net/msf.503-504.699 |
| Popis: |
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). |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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