Novel deformation-induced polymorphic crystallization and softening of Al-based amorphous alloys
| Autor: | F. F. Han, A.L. Greer, Shengli Zhu, Y.D. Han, Fahad M. Al-Marzouki, Fanli Kong, H.W. Bi, Akihisa Inoue, E. Shalaan |
|---|---|
| Přispěvatelé: | Greer, Alan [0000-0001-7360-5439], Apollo - University of Cambridge Repository |
| Rok vydání: | 2018 |
| Předmět: |
HRTEM
Materials science Amorphous alloy Polymers and Plastics Annealing (metallurgy) 02 engineering and technology 01 natural sciences law.invention Brittleness Hardness law 0103 physical sciences Thermal stability Composite material Crystallization Embrittlement Softening 010302 applied physics Amorphous metal Metals and Alloys AP-FIM 021001 nanoscience & nanotechnology Electronic Optical and Magnetic Materials Amorphous solid Ceramics and Composites 0210 nano-technology |
| Zdroj: | Acta Materialia |
| ISSN: | 1359-6454 |
| DOI: | 10.1016/j.actamat.2018.01.016 |
| Popis: | © 2018 Acta Materialia Inc. Melt-spun amorphous ribbons of Al 90 Y 10 (at.%) (90Al) and Al 84 Y 8.5 Ni 4 Co 2 Pd 1 Fe 0.5 (84Al) are cold-rolled at near to liquid-nitrogen temperature or at room temperature, inducing partial crystallization to nanoscale fcc-Al (α-Al). The crystallization is characterized and contrasted with the distinct sequences of reactions on annealing 90Al and 84Al amorphous alloys. Rolling-induced crystallization leads to softening, opposite to the effect of nanocrystallization induced by annealing. The origins of the hardness changes are analyzed. The rolling induces novel polymorphic crystallization to α-Al with extended solid solubility. This transformation, which occurs equally in 84Al and 90Al, despite the much greater thermal stability of the former, allows the ribbons to retain good bending ductility, and delays the onset of embrittlement on subsequent annealing. Partial crystallization induced by cold-rolling is useful in avoiding the formation of compound phases associated with brittleness, and is a promising process for high-solute Al-based amorphous alloys to be further developed as structural materials. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect