Activation energy for the reverse eutectoid reaction in hypo-eutectoid Cu–Al alloys

Adorno, A. T.; Carvalho, T.M.; Magdalena, Aroldo Geraldo; Santos, C.M.A.; Silva, R.A.G.

doi:10.1016/j.tca.2011.12.027

Cited by 17 publications

(4 citation statements)

References 12 publications

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“…13 A number of experimental studies on Al-Cu alloys have been carried out over the past several years. [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] These studies mainly involve the mechanical properties, [14][15][16][17][18][19] corrosion resistance, [20][21][22][23] wear properties, [24][25][26] activation energy, 27 fatigue properties, 28 and so on. But there is no integrated theoretical investigation on thermodynamic properties, thermal stability, and energetic reaction properties.…”

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confidence: 99%

Molecular dynamics simulations on the melting, crystallization, and energetic reaction behaviors of Al/Cu core-shell nanoparticles

Cheng¹,

Zhang²,

Zhang³

et al. 2013

Journal of Applied Physics

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Using molecular dynamics simulations combined with the embedded atom method potential, we investigate the heating, cooling, and energetic reacting of core-shell structured Al-Cu nanoparticles. The thermodynamic properties and structure evolution during continuous heating and cooling processes are also investigated through the characterization of the total potential energy distribution, mean-square-distance and radial distribution function. Some behaviors related to nanometer scale Cu/Al functional particles are derived that two-way diffusion of Al and Cu atoms, glass phase formation for the fast cooling rate, and the crystal phase formation for the low cooling rate. Two-way atomic diffusion occurs first and causes the melting and alloying. In the final alloying structure, Cu and Al atoms mixed very well except for the outmost shell which has more Al atoms. For the investigation of the thermal stability and energetic reaction properties, our study show that a localized alloying reaction between the Al core and Cu shell is very slow when the initial temperature is lower than 600 K. But a two-stage reaction may occur when the initial temperature is 700 K. The reaction rate is determined by the solid-state diffusion of Al atoms in the Cu shell at the first stage, yet the reaction rate is much faster at the second stage, due to the alloying reaction between the liquid Al core and the Cu shell. At higher temperatures such as 800 K and 900 K, the alloying reaction occurs directly between the liquid Al core and the Cu shell.

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confidence: 99%

Molecular dynamics simulations on the melting, crystallization, and energetic reaction behaviors of Al/Cu core-shell nanoparticles

Cheng¹,

Zhang²,

Zhang³

et al. 2013

Journal of Applied Physics

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“…In order to analyze the reaction kinetics, the isoconversional method based on the Model-free kinetics [21,22] was utilized to obtain the activation energy for the bainite precipitation in the Cu-9 wt%Al-10 wt%Mn-3 wt%Ag alloy, considering the peak E 2 in Fig. 7-a…”

Section: Resultsmentioning

confidence: 99%

Phase stability in the Cu-9 wt%Al-10 wt%Mn-3 wt%Ag alloy

Santos

Adorno

Paganotti

et al. 2017

Journal of Physics and Chemistry of Solids

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A B S T R A C TThe phase stability in the Cu-9 wt%Al-10 wt%Mn-3 wt%Ag alloy was analyzed using differential scanning calorimetry (DSC), X-ray diffractometry (XRD), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), optical microscopy (OM) and microhardness measurements with quenching temperature. The results showed that the presence of silver alters the phase stability range and enhances the effect of bainite precipitation on the microhardness values of the Cu-9 wt%Al-10 wt%Mn-3 wt%Ag alloy.

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“…Kissinger's model assumed that the reaction rate corresponding to the peak temperature reached a maximum value during the nonisothermal annealing process. Therefore, the activation energy ( E a ) can be evaluated by determining the slope of

ln (\frac{β}{{T_{normalp}}^{2}})

against

\frac{1}{T_{normalp}}

. The relation between

ln (\frac{β}{{T_{normalp}}^{2}})

and

\frac{1}{T_{normalp}}

obtained from the DSC curves was plotted in Fig.…”

Section: Discussionmentioning

confidence: 99%

Palladium Migration Through a Zirconium Carbide Coating in TRISO‐Coated Fuel Particles

et al. 2016

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Reaction of ZrC with Pd at temperatures up to 1500°C was examined using ZrC/Pd composite, Pd/ZrC-coated TRISO particles, and Pd/ZrC bulk diffusion couples experiments. Intermetallic phase (Pd 3 Zr) and amorphous carbon at the ZrC-Pd interfaces were identified by X-ray diffraction (XRD), Raman and scanning electron microscope (SEM). Moreover, thicknesses of Pd 3 Zr layers were measured by energydispersive X-ray spectrometry (EDS). The validity of the reaction was proved by thermodynamic calculation. The reaction kinetics parameters, i.e., the activation energy (208.2-266.5 kJ/mol) and the reaction order (3.38-3.78) for Pd attacking through a ZrC coating in TRISO particles were determined based on both the DSC curves and the growth of the Pd 3 Zr layer.

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Activation energy for the reverse eutectoid reaction in hypo-eutectoid Cu–Al alloys

Cited by 17 publications

References 12 publications

Molecular dynamics simulations on the melting, crystallization, and energetic reaction behaviors of Al/Cu core-shell nanoparticles

Molecular dynamics simulations on the melting, crystallization, and energetic reaction behaviors of Al/Cu core-shell nanoparticles

Phase stability in the Cu-9 wt%Al-10 wt%Mn-3 wt%Ag alloy

Palladium Migration Through a Zirconium Carbide Coating in TRISO‐Coated Fuel Particles

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