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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Acknowledgments
The present research is supported by Recruitment Program of Global Experts “1000 Talents Plan” of China (WQ20121200052), JSPS KAKENHI Grant Number 26630299 in Japan, Deanship of Scientific Research (DSR), King Abdulaziz University, Jeddah, Saudi Arabia (1-1-1435/HiCi), and the Ministry of Education and Science of the Russian Federation in the framework of the Program aimed to increase the competitiveness of the National University of Science and Technology “MISiS” (No.K1-2015-026).
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Han, F.F., Inoue, A., Han, Y. et al. High formability of glass plus fcc-Al phases in rapidly solidified Al-based multicomponent alloy. J Mater Sci 52, 1246–1254 (2017). https://doi.org/10.1007/s10853-016-0394-6
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DOI: https://doi.org/10.1007/s10853-016-0394-6