A method to quantify crystallinity in amorphous metal alloys: A differential scanning calorimetry study

Abstract

We developed and describe a differential scanning calorimetry method for calculating the initial crystallinity, change of crystallinity and crystallinity percentage of amorphous metal alloys as a function of temperature. Using thermodynamic enthalpies of amorphous, crystalline and partially devitrified specimens, our methodology is capable of determining crystallinity percentages as low as a few percent. Moreover, the linear relationship between the set (pre-determined) and calculated crystallinities of experimental samples indicates that there is no need to prepare calibration samples before measuring the crystallinity percentage of target samples. This technique also eliminates the need for expensive in situ accessories, such as those required in electron microscopy. Thus, the technique is highly relevant as a primary technique for characterization of devitrification behavior in amorphous materials.

Correlation Between Structural and Ionic Transport Properties of Lithium-ion Hybrid Gel Polymer Electrolytes Based PMMA-PLA

“…They also claimed that lithium salt has broadened the T g peak related to the polymer network heterogeneity. In addition, Yazdani et al [57] also reported similar pattern of T g peak as present work, indicating amorphous nature of the samples.…”

Enhanced Mechanical and Antibacterial Properties of Nanocomposites Based on Poly(vinyl Alcohol) and Biopolymer-Derived Reduced Graphene Oxide

“…Especially for PVA–TrGO-2wt.% nanocomposites, the deviation was quite significant, which can be attributed to the following factors: firstly, DSC provides information from the whole sample, whereas WAXD retrieves information within a few µm, hence is surface-sensitive. Thus, the inhomogeneous distribution of TrGO nanofillers in the PVA matrix can lead to a different crystallinity fraction, but with a similar trend [ 49 ], as observed here. Secondly, when the material undergoes thermal treatment during DSC measurement, the temperature elevation promotes relaxation, which can cause a partial structural recovery, leading to a deviation from the true crystallinity of the material, as observed using WAXD.…”

Phase, microstructure and service character of as-deposited and short-time heat-treated Ni-Mo alloys with mixed state

“…This means that there is A small amount of crystalline phases distributed on the amorphous matrix. Considering of the pre-peak and the obviously broaden diffraction peaks, the obtained alloy has the ability to form a complete amorphous [ 24 , 25 ].…”

“…The existence of pre-peaks corresponds to the orientation of crystalline growth. At the same time, the stability of the corresponding short-range chemical structure is related to the stability of amorphous alloys [21][22][23][24][25][26][27][28]. Meanwhile, there is a weaker crystallization peak (2θ�50.38˚) in the diffraction peak, which indicates that there is a crystallization phase in the deposited.…”