Crystallization sequence of an (Al86Ni9La5)98Si2 amorphous alloy under continuous heating
Source abstract
Abstract
Based on isochronal phase transformation kinetics, the crystallization sequence of (Al 86Ni 9La 5) 98Si 2 amorphous alloy was fcc-Al→fcc-Al→Al 3Ni+La 3Al 11 +unidentified phases at a heating rate > 5 K/min; while the crystallization sequence changed to fcc-Al→Al 3Ni+La 3Al 11+unidentified phases→fcc-Al at a heating rate < 5 K/min. However, the last two crystallization events were kinked rather than reversed in sequence even if the heating rate decreased from 160 to 1 K/min in experiments. This inconsistency illustrated that the crystallization sequence associated with the two crystallization events can hardly be profiled sophisticatedly by their individual thermal analyzed kinetics, and here was attributed to two bifurcate originations: the prerequisite conditions for the formation of Al 3Ni, La 3Al 11 , and unidentified phases was actually the precipitation of the second stage fcc-Al, and the monotonous Al can hardly be existed independently in the amorphous state.
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Research context
OpenAlex topics: Metallic Glasses and Amorphous Alloys · Phase-change materials and chalcogenides
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