Resistiometric determination of phase transformations in VHx and VDx

1980 ◽  
Vol 75 (2) ◽  
pp. 207-222 ◽  
Author(s):  
M.W Pershing ◽  
G Bambakidis ◽  
J.F Thomas ◽  
R.C Bowman
Keyword(s):  
Phase Transformations

scholarly journals Crystalline forms of silver iodide II: Determination of phase transformations

2007 ◽  
Vol 72 (8-9) ◽  
pp. 857-868 ◽  
Author(s):  
Marija Vukic ◽  
Dragan Veselinovic ◽  
Vesna Markovic
Keyword(s):  
Phase Transition ◽  
Phase Transformations ◽  
Heating Rate ◽  
Silver Iodide ◽  
Room Temperature ◽  
Sample Heating ◽  
Crystalline Forms

In order to obtain appropriate forms of AgI (?- and ?-), a procedure was developed to synthesize AgI at room temperature (23?C), whereby samples of varying crystallographic purity and of varying crystallographic contents of the different forms were obtained. This paper presents the results of investigations of the influence of the manner of preparation of ?-AgI and ?-AgI samples and the sample heating rate on the phase transformations and their temperatures. During the heating of non-ground, ground and pressed synthesized AgI samples, the phase transformations and the corresponding temperatures for one ?-AgI and four ?-AgI samples with different ?-AgI contents (representing a crystallographic impurity) were identified. The following phase transformations were observed for the non-ground AgI samples: ?-AgI ? ?-AgI at 149.6?C (for the ?-AgI sample) and ?-AgI ? ?-AgI at 148.7?C or 148.2?C for the ?-AgI samples with a minimum content of ?-AgI (less than 7 %), as a crystallographic impurity. The phase transition ?-AgI ? ?-AgI was irreversible because ?-AgI was obtained whenever the samples were heated up to 260?C. Manual sample grinding, as well as pressing at p1 = 650 MPa and p2 = 900 MPa resulted in the ?-AgI ? ?-AgI phase transition in all the investigated cases. .

scholarly journals Phase transformations and thermal conductivity of the In-Ag alloys

10.30544/488 ◽  
2020 ◽  
Vol 26 (3) ◽  
pp. 239-251
Author(s):  
Dragan Miroslav Manasijevic ◽  
Ljubiša Balanović ◽  
Ivana Markovic ◽  
Milan Gorgievski ◽  
Uros Stamenkovic ◽  
...  
Keyword(s):  
Phase Transition ◽  
Thermal Conductivity ◽  
Phase Transformations ◽  
Silver Content ◽  
Calphad Method ◽  
Flash Method ◽  
Scanning Calorimetry ◽  
Phase Transition Temperatures ◽  
Equilibrium Solidification

Phase transformations and thermal conductivity of three In-Ag alloys with 5, 15, and 45 wt.% of Ag were experimentally investigated in the present work. Phase transition temperatures were measured using differential scanning calorimetry (DSC). DSC heating scans were compared with the equilibrium and non-equilibrium solidification paths, calculated by using optimized thermodynamic parameters from literature and calculation of phase diagrams (CALPHAD) method.  The flash method was employed for the determination of thermal diffusivity and thermal conductivity of the investigated alloys in the temperature range from 25 to 100 °C. It has been found that an increase in silver content does not lead to an increase in the thermal conductivity of the investigated alloys. Thermal conductivities for all three investigated In-Ag alloys slightly decrease with temperature increasing.

scholarly journals New advances in the laboratory characterization of refractories: testing and modelling

2017 ◽  
Vol 114 (6) ◽  
pp. 610 ◽  
Author(s):  
Jacques Poirier ◽  
Eric Blond ◽  
Emmanuel de Bilbao ◽  
Rudy Michel ◽  
Antoine Coulon ◽  
...  
Keyword(s):  
Phase Transformations ◽  
Numerical Analyses ◽  
Laboratory Methods ◽  
Corrosion Kinetics ◽  
Laboratory Characterization ◽  
Deformation Phase ◽  
Macroscopic Deformation

This publication presents new advances in the field of refractories characterization. These laboratory methods that combine experiments and numerical analyses and concern both the thermomechanical and thermochemical behaviour are illustrated through different examples: identification of asymmetrical creep, determination of elastic and inelastic properties, measurements of macroscopic deformation, phase transformations or corrosion kinetics. These advanced techniques offer the refractory community new opportunities to improve the knowledge and the prediction of the phenomena of degradation of the refractories.

scholarly journals Investigations of Temperatures of Phase Transformations of Low-Alloyed Reinforcing Steel within the Heat Treatment Temperature Range

2017 ◽  
Vol 62 (2) ◽  
pp. 891-897 ◽  
Author(s):  
T. Kargul
Keyword(s):  
Phase Transformations ◽  
Treatment Temperature ◽  
Protective Atmosphere ◽  
Eutectoid Transformation ◽  
Dsc Analysis ◽  
Temperature Range ◽  
Proeutectoid Ferrite ◽  
Temperatures Of Phase Transformations ◽  
Tempcore Process

AbstractThe paper presents the results of DSC analysis of steel B500SP produced in the process of continuous casting, which is intended for the production reinforcement rods with high ductility. Studies were carried out in the temperature range below 1000°C in a protective atmosphere of helium during samples heating program. The main objective of the study was to determine the temperature range of austenite structure formation during heating. As a result of performed experiments:Ac1s,Ac1f– temperatures of the beginning and finish of the eutectoid transformation,Ac2– Curie temperature of the ferrite magnetic transformation and the temperature Ac3of transformation of proeutectoid ferrite into austenite were elaborated. Experimental determination of phase transformations temperatures of steel B500SP has great importance for production technology of reinforcement rods, because good mechanical properties of rods are formed by the special thermal treatment in Tempcore process.

scholarly journals Solid-Solid Phase Transformations and Their Kinetics in Ti-Al-Nb Alloys

Metals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1991
Author(s):  
Benedikt Distl ◽  
Katja Hauschildt ◽  
Florian Pyczak ◽  
Frank Stein
Keyword(s):  
Phase Transformations ◽  
Heating Rate ◽  
Solid Phase ◽  
Thermal Analyses ◽  
Order Type ◽  
Heating Rates ◽  
Transformation Temperatures ◽  
Intermetallic Materials ◽  
Reduction Of Co2

The application of light-weight intermetallic materials to address the growing interest and necessity for reduction of CO2 emissions and environmental concerns has led to intensive research into TiAl-based alloy systems. However, the knowledge about phase relations and transformations is still very incomplete. Therefore, the results presented here from systematic thermal analyses of phase transformations in 12 ternary Ti-Al-Nb alloys and one binary Ti-Al measured with 4–5 different heating rates (0.8 to 10 °C/min) give insights in the kinetics of the second-order type reaction of ordered (βTi)o to disordered (βTi) as well as the three first-order type transformations from Ti3Al to (αTi), ωo (Ti4NbAl3) to (βTi)o, and O (Ti2NbAl) to (βTi)o. The sometimes-strong heating rate dependence of the transformation temperatures is found to vary systematically in dependence on the complexity of the transformations. The dependence on heating rate is nonlinear in all cases and can be well described by a model for solid-solid phase transformations reported in the literature, which allows the determination of the equilibrium transformation temperatures.

scholarly journals Determination of the heat of phase transformations in calorimetric studies

2018 ◽  
Vol 2018 (4) ◽  
pp. 136-143
Author(s):  
V.E. Vasilenkov ◽  
◽  
V.A. Trush ◽  
Keyword(s):  
Phase Transformations ◽  
Calorimetric Studies
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