High formability of glass plus fcc-Al phases in rapidly solidified Al-based multicomponent alloy |
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Authors: | F F Han A Inoue F L Kong S L Zhu E Shalaan F Al-Marzouki |
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Affiliation: | 1.School of Materials Science and Engineering,Tianjin University,Tianjin,China;2.International Institute of Green Materials,Josai International University,Togane,Japan;3.Department of Physics,King Abdulaziz University,Jeddah,Saudi Arabia;4.MISiS, National University of Science and Technology,Moscow,Russia |
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Abstract: | A multicomponent Al84Y9Ni4Co1.5Fe0.5Pd1 alloy was found to keep a mixed glassy + Al phases in the relatively large ribbon thickness range up to about 200 μm for the melt-spun ribbon and in the diameter range up to about 1100 μm for the wedge-shaped cone rod prepared by injection copper mold casting. The glassy phase in the Al-based alloy has a unique crystallization process of glass transition, followed by supercooled liquid region, fcc-Al + glass, and then Al + Al3Y + Al9 (Co, Fe)2 + unknown phase. It is also noticed that the primary precipitation phase from supercooled liquid is composed of an Al phase instead of coexistent Al + compound phases, being different from the crystallization mode from supercooled liquid for ordinary Al-based glassy alloys. In addition, it is noticed that the mixed Al and glassy phases are extended in a wide heating temperature range of 588–703 K, which is favorable for the development of high-strength nanostructure Al-based bulk alloys obtained by warm extrusion of mixed Al + amorphous phases. The Vickers hardness is about 415 for the glassy phase and increases significantly to about 580 for the mixed Al and glassy phases. The knowledge of forming Al + glassy phases with high hardness in the wide solidification and annealing conditions through high stability up to complete crystallization for the multicomponent alloy is promising for future development of a high-strength Al-based bulk alloy. |
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