Precipitation kinetics in an air-cooled aluminum alloy: A comparison of scanning and isothermal calorimetry measurement methods

Smith, George W.

doi:10.1016/s0040-6031(97)00452-8

Cited by 25 publications

(14 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Kissinger method [10] for deriving the activation energy for θ precipitation is based on the fact that the observed peak temperature depends on the scan rate, φ = dT dt , of the experiment. This shift in the peak temperatures l 3 and l 4 with a change in scan rate is shown in Fig.…”

Section: Kissinger Analysismentioning

confidence: 99%

See 1 more Smart Citation

Precipitation in AlCu4.3 and AlCu4Mg alloys studied by dilatometry and calorimetry

Mohammadian¹,

Degischer²

2011

View full text Add to dashboard Cite

The precipitation kinetics of a laboratory alloy (AlCu4.3) is compared with that of a commercial alloy AW2024 (AlCu4Mg) by continuous and isothermal dilatometry and differential scanning calorimetry (DSC). The precipitation and decomposition sequence are demonstrated by means of DSC. Precipitation of θ causes an accelerated thermal expansion of AlCu4.3 complemented by retarded expansion in the dissolution temperature range. Dilatometry results from several temperature scan rates are analysed by the Kissinger method to give apparent activation energies and rate constants for the precipitation of θ in AlCu4.3. The activation energy of formation varies from 80 to 100 kJ mol −1 , while that for dissolution amounts to 200 kJ mol −1 . The sequence of precipitation of the S phase in solutionized 2024 aluminium is more complex, but shows only little effect on the thermal expansion.K e y w o r d s : Al-Cu alloys, precipitation kinetics, dilatometry, differential scanning calorimetry (DSC), activation energy

show abstract

Section: Kissinger Analysismentioning

confidence: 99%

“…Here, the coefficient of thermal expansion difference to Al is plotted versus temperature for precipitation in AlCu4.3 alloy, at scan rates 5, 10 and 20 K min −1 . The Kissinger expression as modified by Mittemeijer et al [10]:…”

Section: Kissinger Analysismentioning

confidence: 99%

Precipitation in AlCu4.3 and AlCu4Mg alloys studied by dilatometry and calorimetry

Mohammadian¹,

Degischer²

2011

View full text Add to dashboard Cite

show abstract

“…The activation energy of growth was about 95 kJ/mol and is close to that obtained for diffusion of copper in aluminum. [9,11] During annealing the samples in the dilatometer at a temperature range of 480-540°C contracted (Fig. 5) because of the increase in the amount of copper in solid solution.…”

Section: Analysis and Discussionmentioning

confidence: 99%

“…For continuous heating kinetic studies of activation energy Q of the transformations, the Kissinger method [6,[8][9][10] was used,…”

Section: Precipitation and Dissolution Studiesmentioning

confidence: 99%

Kinetics of transformation during supersaturation and aging of the Al-4.7mass%Cu alloy: Grain size, dilatometric, and differential thermal analysis studies

Wierszyłłowski

Stankowiak

Wieczorek

et al. 2005

J Phs Eqil and Diff

View full text Add to dashboard Cite

The processes taking place during supersaturation of the Al-4.7mass%Cu alloy have been studied by the methods of quantitative metallography and dilatometry. The grain growth activation energy was about 95 kJ/mol, and the exponent of time, n, was close to 0.4. Dissolution of precipitates caused two-stage shrinkage of the sample, which had activation energies of 90 kJ/mol (first stage, n = 0.8) and 63 kJ/mol (second stage, n = 0.4).The kinetics of the phase transformation during aging of the Al-4.7mass%Cu alloy has been studied by the dilatometry and differential thermal analysis The activation energy of the precipitation processes within the range of 50-320°C varied between 50 and 100 kJ/mol and confirmed the results obtained previously. For the precipitation processes within the range of 320-462°C, the activation energy varied from 226 to 300 kJ/mol. The results obtained were compared with literature data with good agreement.

show abstract

“…The kinetic parameters determined by the Kissinger analysis are very important as they help to provide a prediction of the fraction transformed as a function of time during an isothermal aging. Different values of the activation energies were reported in the literature for θ′-Al2Cu [43][44][45] and θ-Al2Cu [43] for binary Al-Cu alloys. In the binary Al-3.5 wt%Cu alloy studied in our previous study [22], the fraction transformed of GP zones and θ′-Al2Cu started to rise significantly after respectively…”

Section: Calorimetric Precipitation Studymentioning

confidence: 99%

Precipitation Kinetics and Evaluation of the Interfacial Mobility of Precipitates in an AlSi7Cu3.5Mg0.15 Cast Alloy with Zr and V Additions

Heugue

Larouche

Breton

et al. 2019

Metals

View full text Add to dashboard Cite

Recent environmental restrictions constrained car manufacturers to promote cast aluminum alloys working at high temperatures (180 °C–300 °C). The development of new alloys permits the fabrication of higher-strength components in engine downsizing. Those technologies increase internal loadings and specific power and stretch current materials to their limits. Transition metals in aluminum alloys are good candidates to improve physical, mechanical, and thermodynamic properties with the aim of increasing service life of parts. This study is focused on the modified AlSi7Cu3.5Mg0.15 alloy where Mn, Zr, and V have been added as alloying elements for high-temperature applications. The characterization of the cast alloy in this study helps to evaluate and understand its performance according to their physical state: As-cast, as-quenched, or artificially aged. The precipitation kinetics of the AlSi7Cu3.5Mg0.15 (Mn, Zr, V) alloy has been characterized by differential scanning calorimetry (DSC), transmission electron microscopy (TEM) observations, and micro-hardness testing. The Kissinger analysis was applied to extract activation energies from non-isothermal DSC runs conducted at different stationary heating rates. Finally, first-order evaluations of the interfacial mobility of precipitates were obtained.

show abstract

Precipitation kinetics in an air-cooled aluminum alloy: A comparison of scanning and isothermal calorimetry measurement methods

Cited by 25 publications

References 39 publications

Precipitation in AlCu4.3 and AlCu4Mg alloys studied by dilatometry and calorimetry

Precipitation in AlCu4.3 and AlCu4Mg alloys studied by dilatometry and calorimetry

Kinetics of transformation during supersaturation and aging of the Al-4.7mass%Cu alloy: Grain size, dilatometric, and differential thermal analysis studies

Precipitation Kinetics and Evaluation of the Interfacial Mobility of Precipitates in an AlSi7Cu3.5Mg0.15 Cast Alloy with Zr and V Additions

Contact Info

Product

Resources

About