Impact of Gd minor alloying on the crystallization kinetics of Pd40Ni40P20 bulk metallic glass
Source abstract
Abstract
Minor alloying of metallic glasses is understood as a possible way to tune its properties and provides a study framework to the origin of their effects. Here, crystallization kinetics of Pd 40Ni 40P 20 and minor-alloyed samples (Pd 40Ni 40P 20) 99Gd 1 were studied using isothermal and isochronal calorimetry and the results were analyzed using the Johnson-Mehl-Avrami-Kolmogorov model. The addition of 1 at. % Gd into the primary alloy results in a substantial alteration of the crystallization kinetics. The Avrami exponent obtained directly from the calorimetric measurements varies from 2.5 for the ternary alloy to almost 4 for the minor-alloyed sample, indicating a change of the crystallization mechanism from a diffusion-controlled crystallization process with a constant nucleation rate and a gradually decreasing three-dimensional growth rate, to a transformation with a constant nucleation rate and a constant three-dimensional growth rate. TEM (transmission electron microscopy) microstructural analysis of the crystallized state indicates the formation of Pd-Gd-P areas, which might accelerate crystallization kinetics.
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Research context
OpenAlex topics: Metallic Glasses and Amorphous Alloys · Material Dynamics and Properties · Phase-change materials and chalcogenides
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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