Journal ArticleDOI
Crystallization behavior of spray-formed and melt-spun Al89La6Ni5 hybrid composites with amorphous and nanostructured phases
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TLDR
In this article, the crystallization behavior of spray-formed and melt-spun Al 89 La 6 Ni 5 alloys was studied, and the fraction of amorphous phase in the spray formed composite was determined to be 36% by DSC, which came mostly from supercooled liquid droplets upon spray forming.Abstract:
The crystallization behavior of spray-formed and melt-spun Al 89 La 6 Ni 5 alloys was studied. Spray forming process could produce a bulk scale Al 89 La 6 Ni 5 hybrid composite consisting of amorphous and nanostructured phases directly without the need of an amorphous precursor. The fraction of amorphous phase in the spray-formed composite was determined to be 36% by DSC, which came mostly from supercooled liquid droplets upon spray forming. Amorphous phase partially devitrified to nano-scale fcc-Al secondary crystals during deposition. Two significant primary crystals observed in the spray-formed bulk hybrid composite are Al 3 Ni and Al 11 La 3 (Ni), but their size is reduced to about 1 μm. Contrary to the microstructure of spray-formed deposit, the heat-treated and fully devitrified melt-spun ribbon hybrid composite consists of nano-scale fcc-Al, Al 3 Ni, Al 11 La 3 as well as some metastable Al 6 Ni and Al 4 LaNi phases with sizes of about 200 nm. Deformation twins were found in the Al 11 La 3 (Ni) crystals in spray-formed deposit, but not in the fully devitrified ribbon. Finally, the microstructure structure evolution of spray-formed deposit and heat-treated ribbon are studied and proposed.read more
Citations
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Recent progress in metallic glasses in Taiwan
TL;DR: The recent research and development on metallic glasses in Taiwan over the past decade is reviewed in this paper, where the major focus was on developing tougher bulk metallic glasses (BMGs), bulk metallic glass composites (BMGCs), and thin film metallic glasses(TFMGs), mostly in Zr and Mg based systems.
Journal ArticleDOI
Spray formed Al-based amorphous matrix nanocomposite plate
TL;DR: In this article, a spray-formed Al 86 Si 0.5 Ni 4.06 Co 2.94 Y 6 La 0.94 Co 2.5 amorphous matrix nanocomposite plate with a rough diameter of 200mm and a maximum thickness of 12mm has been prepared by spray-forming.
Journal ArticleDOI
Microstructure and mechanical properties of partially amorphous Al85Y8Ni5Co2 plate produced by spray forming
Vikas C Srivastava,Kumar Babu Surreddi,Sergio Scudino,Marco Schowalter,Volker Uhlenwinkel,Alwin Schulz,Jürgen Eckert,Andreas Rosenauer,H-W Zoch +8 more
TL;DR: In this article, a 12mm thick Al 85 Y 8 Ni 5 Co 2 plate was spray deposited on a 30mm thick copper substrate pre-heated to 383 K. The hardness of different microstructural features and the compressive strength of the deposit, after extrusion at 723 K, were evaluated.
Journal ArticleDOI
Formation of Nanocrystalline Matrix Composite during Spray Forming of Al83La5Y5Ni5Co2
Vikas C Srivastava,Kumar Babu Surreddi,Volker Uhlenwinkel,Alwin Schulz,Jürgen Eckert,H-W Zoch +5 more
TL;DR: In this article, a multicomponent glass-forming Al83Y5La5Ni5Co2 (at pct) alloy was spray deposited on a copper substrate to produce an 8mm-thick plate.
Journal ArticleDOI
Spray Forming of Bulk Ultrafine-Grained Al-Fe-Cr-Ti
C. Banjongprasert,C. Banjongprasert,Simon C. Hogg,E. Liotti,Caroline A. Kirk,S. P. Thompson,J. Mi,Patrick S. Grant +7 more
TL;DR: In this paper, the microstructure and properties of Al-2.7Fe-1.9Cr and 1.8Ti alloys were compared with those of similar alloys produced by casting, powder aomization (PA), and mechanical alloying (MA) routes.
References
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Amorphous, nanoquasicrystalline and nanocrystalline alloys in Al-based systems
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Nanocrystalline metals crystallized from amorphous solids: nanocrystallization, structure, and properties
TL;DR: A review of the state of the art in this field can be found in this article, where the current status of research and developments on the nanocrystallization, microstructure and properties of the materials are summarized.
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Al–La–Ni Amorphous Alloys with a Wide Supercooled Liquid Region
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Calorimetric evidence for the microquasicrystalline structure of amorphous Al/transition metal alloys
Lincoln C. Chen,Frans Spaepen +1 more
TL;DR: The idea that a material exhibiting broad diffraction halos does not have a characteristic amorphous structure but is just an assembly of randomly orientated microcrystals is a remarkably resilient one as mentioned in this paper.
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Nanocrystal development during primary crystallization of amorphous alloys
TL;DR: In this article, a kinetics analysis has been developed to account for nanocrystal growth with diffusion field impingement and unequal component diffusivities in multicomponent amorphous alloys.