A Differential Scanning Calorimetric Study of the Mg-Cu-Y System

2012 ◽  
Vol 706-709 ◽  
pp. 1215-1220 ◽  
Author(s):  
Mohammad Mezbahul-Islam ◽  
Elhachmi Essadiqi ◽  
Mamoun Medraj
Keyword(s):  
Differential Scanning Calorimetry ◽  
Metallic Glass ◽  
Thermodynamic Modeling ◽  
Differential Scanning Calorimetric ◽  
Phase Assemblage ◽  
Calorimetric Study ◽  
Solidification Behavior ◽  
Scanning Calorimetry ◽  
Ternary Compounds ◽  
Melting Temperatures

The Mg-Cu-Y system has been experimentally investigated using differential scanning calorimetry (DSC). Vertical sections and phase assemblage diagrams are calculated using thermodynamic modeling. Solidification behavior of the key alloys was discussed in light of the thermodynamic calculation. Melting temperatures of two of the ternary compounds; Mg18CuY and Mg4CuY, are predicted using the modified thermodynamic database of this system. Key words: Mg alloys, Bulk metallic glass, Differential scanning calorimetry, Thermodynamic modeling.

scholarly journals Calorimetric study on Bi-Cu-Sn alloys

2019 ◽  
Vol 38 (2019) ◽  
pp. 541-546
Author(s):  
Jolanta Romanowska
Keyword(s):  
Differential Scanning Calorimetry ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Temperature Interval ◽  
Energy Dispersive Spectrometer ◽  
Energy Dispersive ◽  
Calorimetric Study ◽  
Calorimetric Investigation ◽  
Scanning Calorimetry ◽  
Scanning Electron

AbstractThe paper presents results of calorimetric investigation of the Bi-Cu-Sn system by means of differential scanning calorimetry (DSC) at the temperature interval 25-1250∘C, Values of liquidus, solidus and invariant reactions temperatures, as well as melting enthalpies of the selected alloys were determined. Microstructure investigation of the alloys were performed by the use of a scanning electron microscope (SEM) equipped with an energy-dispersive spectrometer (EDS).

scholarly journals Structural and Thermo-Mechanical Properties of Poly(ε-caprolactone) Modified by Various Peroxide Initiators

Polymers ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 1101 ◽  
Author(s):  
Przybysz ◽  
Hejna ◽  
Haponiuk ◽  
Formela
Keyword(s):  
Mechanical Properties ◽  
Differential Scanning Calorimetry ◽  
Cross Linking ◽  
Mechanical And Thermal Properties ◽  
Dicumyl Peroxide ◽  
Organic Peroxides ◽  
Reactive Processing ◽  
Scanning Calorimetry ◽  
Melting Temperatures ◽  
Gel Fraction

The modification of poly(ε-caprolactone) (PCL) was successfully conducted during reactive processing in the presence of dicumyl peroxide (DCP) or di-(2-tert-butyl-peroxyisopropyl)-benzene (BIB). The peroxide initiators were applied in the various amounts of 0.5 or 1.0 pbw (part by weight) into the PCL matrix. The effects of the initiator type and its concentration on the structure and mechanical and thermal properties of PCL were investigated. To achieve a detailed and proper explication of this phenomenon, the decomposition and melting temperatures of DCP and BIB initiators were measured by differential scanning calorimetry. The conjecture of the branching or cross-linking of PCL structure via used peroxides was studied by gel fraction content measurement. Modification in the presence of BIB in PCL was found to effectively increase gel fraction. The result showed that the cross-linking of PCL started at a low content of BIB, while PCL modified by high DCP content was only partially cross-linked or branched. PCL branching and cross-linking were found to have a significant impact on the mechanical properties of PCL. However, the effect of used initiators on poly(ε-caprolactone) properties strongly depended on their structure and content. The obtained results indicated that, for the modification towards cross-linking/branching of PCL structure by using organic peroxides, the best mechanical properties were achieved for PCL modified by 0.5 pbw BIB or 1.0 pbw DCP, while the PCL modified by 1.0 pbw BIB possessed poor mechanical properties, as it was related to over cross-linking.

A Differential Scanning Calorimetric Study of Carbide Transition in 10Cr Tempered Martensitic Steels

2015 ◽  
Vol 1754 ◽  
pp. 37-42
Author(s):  
H.C. Wang
Keyword(s):  
Electron Microscopy ◽  
Carbide Precipitation ◽  
The Other ◽  
Differential Scanning Calorimetric ◽  
Calorimetric Study ◽  
Martensitic Steels ◽  
Scanning Calorimetry ◽  
Precise Understanding ◽  
Kinetics Of

ABSTRACTThe process and kinetics of carbide precipitation upon tempering of an Fe-10Cr-0.15C (wt.%) alloy fabricated from high-purity components has been studied. Differential scanning calorimetry reveals three exotherms in a temperature range of 100-700°C. Using advanced electron microscopy and Kissinger analysis, the exothermic processes have been interpreted. Cementite precipitated first upon tempering at temperatures as low as 200°C; M7C3 and M23C6 appear at higher temperatures, precipitating at approximately the same time but on different sites (M7C3 within grains and laths and M23C6 on grain and lath boundaries). Subsequently, the more stable M23C6 coarsens at the expense of M7C3, which dissolves. The first exotherm was interpreted as being related to the precipitation of cementite whilst the other two overlapping exotherms were interpreted as relating to the concurrent precipitation and coarsening of M7C3 and M23C6, respectively. In-situ SEM and TEM observation is being conducted in order to obtain a more precise understanding and further validate the interpretation of the DSC results.

Desorption of Hydrogen from Palladium and Palladium-Silver Alloys followed by Differential Scanning Calorimetry

1972 ◽  
Vol 50 (9) ◽  
pp. 1321-1324 ◽  
Author(s):  
D. Artman ◽  
Ted B. Flanagan
Keyword(s):  
Differential Scanning Calorimetry ◽  
Slow Step ◽  
Differential Scanning Calorimetric ◽  
Solid State Diffusion ◽  
Palladium Alloys ◽  
Scanning Calorimetry ◽  
Silver Alloys ◽  
State Diffusion ◽  
Silver Palladium ◽  
Palladium Silver

Differential scanning calorimetric curves have been obtained corresponding to the desorption of hydrogen from palladium and palladium–silver alloys. There was no evidence for the existence of an exotherm, following the endothermic desorption of hydrogen, which has been previously found and attributed to the relaxation of a metastable, expanded hydrogen-free palladium lattice. Heats of desorption have been evaluated from the areas of the endotherms and these are reasonable in the light of values obtained by other techniques. Comparisons of scanning curves for palladized and unpalladized hydrogen-containing silver–palladium alloys demonstrate that solid-state diffusion cannot be the slow step for the former but may be for the latter.

Nanometer-scale Structural Relaxation in Zr-based Bulk Metallic Glass

2007 ◽  
Vol 1048 ◽  
Author(s):  
Jinwoo Hwang ◽  
Hongbo Cao ◽  
Paul M. Voyles
Keyword(s):  
Electron Microscopy ◽  
Differential Scanning Calorimetry ◽  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Range Order ◽  
Nanometer Scale ◽  
Length Scale ◽  
Scanning Calorimetry ◽  
Medium Range Order ◽  
Medium Range

AbstractWe investigated the influence of annealing on the nanometer-scale medium-range order in Zr54Cu38Al8 bulk metallic glass using fluctuation electron microscopy. Fluctuation microscopy experiments probing structure at a length scale of 1 nm show that the as-cast Zr bulk metallic glass contains significant medium range order. That structure is unchanged by annealing at 87% of the glass transition temperature for 24 hours, although that anneal does significantly change the differential scanning calorimetry trace.

scholarly journals Accuracy in the experimental calorimetric study of the crystallization kinetics and predictive transformation diagrams: Application to a Ga–Te amorphous alloy

1998 ◽  
Vol 13 (3) ◽  
pp. 744-753 ◽  
Author(s):  
N. Clavaguera ◽  
M. T. Clavaguera-Mora ◽  
M. Fontana
Keyword(s):  
Amorphous Alloy ◽  
Primary Crystallization ◽  
Continuous Heating ◽  
Differential Scanning Calorimetric ◽  
Nominal Composition ◽  
Base Line ◽  
Calorimetric Study ◽  
Calorimetric Data ◽  
Scanning Calorimetry ◽  
Transformation Diagrams

The uncertainties inherent to experimental differential scanning calorimetric data are evaluated. A new procedure is developed to perform the kinetic analysis of continuous heating calorimetric data when the heat capacity of the sample changes during the crystallization. The accuracy of isothermal calorimetric data is analyzed in terms of the peak-to-peak noise of the calorimetric signal and base line drift typical of differential scanning calorimetry equipment. Their influence in the evaluation of the kinetic parameter is discussed. An empirical construction of the time-temperature and temperature-heating rate transformation diagrams, grounded on the kinetic parameters, is presented. The method is applied to the kinetic study of the primary crystallization of Te in an amorphous alloy of nominal composition Ga20Te80, obtained by rapid solidification.

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