technique could be developed to replace metallography as the primary control tool [ 3 ].
Thermal analysis as a technique is used to evaluate the melt quality. By this method, some characteristic values are extracted from a coolingcurve and/or its
well. Thermal analysis has been gaining increasing acceptance in many aluminium foundries as a faster, online process control, non-destructive and quantitative technique [ 7 ] that can be used before casting [ 8 ].
Authors:M. B. Djurdjevic, J. H. Sokolowski, and Z. Odanovic
plotted on temperature–composition equilibrium (phase) diagrams.
The non-equilibrium coolingcurve method is useful for commercial applications for a number of reasons: it is simple, inexpensive, and provides consistent rapid results for all
Authors:Emma Chiavaro, Lorenzo Cerretani, Maria Paciulli, and Stefano Vecchio
samples of indium ( T fus = 156.6 °C, Δ fus H = 3.266 kJ mol −1 ) and n -dodecane ( T fus = −9.65 °C, Δ fus H = 36.918 J mol −1 ). The temperature and heat flow uncertainties were estimated to be ±0.1 °C and ±0.05 mW, respectively. DSC coolingcurves
Authors:Stelian Stan, Mihai Chisamera, Iulian Riposan, and Michael Barstow
, thermal analysis became an important tool to reflect the solidification behaviour of foundry alloys, ferrous and non-ferrous [ 5 – 18 ]. The coolingcurve itself, as well as its derivatives and related temperatures, and calculated parameters provide
A data acquisition system and the SAD2 software, that provide characteristic cooling curves, in combination with microstructure
analysis were used to study precipitates formation in the AA380.0 aluminium alloys modified by adding extra magnesium. The
samples were solidified with distinct cooling rates caused by carrying out the solidification in shell and permanent molds.
The mathematics processing of the cooling curves in agreement with the microstructure analysis have confirmed the remarkable
presence of both the Al–Si dendrite network and the Mg2Si interdendritic phase in the alloys with the addition of extra magnesium.
Authors:Musbah Mahfoud, A. Prasada Rao, and Daryoush Emadi
Recycling of aluminum scrap has gained interest owing to its economic and ecological benefits. Unfortunately, during the collection
of scrap from a mixer of junk from various sectors it is difficult to ensure that the recycled alloy has the same chemical
composition as that of already existing commercial alloys. Consequently, some of the alloying elements become trace/tramp
elements in the recycled alloy. Therefore, in order to obtain high performance recycled alloys, controlling the impurity levels
of the aluminum melt is of vital importance. Normally, computer aided cooling curve analysis (CA-CCA) is used to find the
relationship between cooling curve parameters, melt treatments, alloy composition, and properties. In the present study, the
first differential thermal analysis (DTA) approach has been used to detect and quantify impurity elements in scrap-like liquid
The curves of heating and cooling crystalline lanthanum nitrate were registered and numerical differentiation was carried
out. The first derivatives of kinetic curves expressed as the temperature function make it possible to carry out comparative
studies of dissolution and crystallization. Superposition of relative water concentration scale on the third derivative of
heating and cooling curves make the analysis of stoichiometry and mechanism of hydration changes possible in the solid phase
and saturated solutions.
Authors:D. živković, Ž. živković, L. Stuparević, and S. Rančić
Results of the thermodynamic investigations in the Bi–GaSb system are presented in this paper. Thermodynamic characteristics
experimentally determined by Oelsen's calorimetric method were compared with values predicted by different thermodynamic predicting
methods (general solution model, Kohler, Muggianu, Toop, Hillert) at the temperature of 1073 K. Also, based on the obtained
cooling curves and microstructure analysis of the investigated samples by optical microscopy, phase diagram of the Bi–GaSb
system was investigated and compared with literature data.
Results of the comparative thermodynamic analysis of the Bi-Ga0.1Sb0.9 section in theBi-Ga-Sb system are given in this paper. Experimental calorimetric investigations were done according to Oelsen's
method, while for the thermodynamic prediction Chou's general solution model was applied. Activities, activity coefficients,
partial molar quantities for bismuth and integral molar quantities were obtained at a temperature of 1073 K. Based on obtained
cooling curves, DTA and SEM results for the investigated samples, phase diagram of the investigated section is constructed
and presented in this paper, too.