Phase decomposition in an Fe-40at.% Cr alloy after isothermal aging and its effect on hardening

López-Hirata, Vı́ctor M.; Soriano-Vargas, Orlando; Rosales-Dorantes, Hector J.; Saucedo‐Muñoz, Maribel L.

doi:10.1016/j.matchar.2011.05.012

Cited by 20 publications

(11 citation statements)

References 8 publications

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“…Kobayashi and Takasugi observed sphericallike particles in the Fe-17 at.% Cr-8 at.% Al alloy [15]. In addition, the separated particles and the worm shaped α′ phase are similar to the high resolution transmission electron microscopy (HR-TEM) micrographs of the Fe-40 at.% Cr alloy aged at 773 K for 750 h [49,50]. Therefore, the simulated morphology of the α ′ phase in the Fe-38 at.% Cr-10 at.% Al alloy is reasonable.…”

Section: Resultssupporting

confidence: 55%

Quantitative Phase-Field Simulation of Composition Partition and Separation Kinetics of Nanoscale Phase in Fe-Cr-Al Alloy

Chen

Shi

et al. 2019

Journal of Nanomaterials

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Phase separation of the Cr-enriched nanoscale α′ phase in the Fe-38 at.% Cr-10 at.% Al alloy is studied by utilizing phase-field simulation. The partition of elements in the α and α′ phases is clarified with the composition evolution through the α/α′ phase interface, and the separation kinetics is quantitatively investigated by the temporal evolution of the size and volume fraction of the α′ phase. Aluminum partitions into the Fe-enriched α phase and depletes in the α′ phase, and the partition coefficient decreases as the temperature changes from 720 K to 760 K for the steady-state coarsening stage. As the temperature increases, the initial change rate of the volume fraction of the α′ phase is faster, indicating an accelerated phase separation. At the coarsening stage, the average particle distance and coarsening rate constant of the α′ phase increase with increased temperature, and the ratio of the Ostwald ripening is dominating compared with coalescence coarsening. The element partition and kinetics evolution of the α′ phase with temperature are helpful for the morphology and property predication of nanoscale precipitates.

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Section: Resultssupporting

confidence: 55%

Quantitative Phase-Field Simulation of Composition Partition and Separation Kinetics of Nanoscale Phase in Fe-Cr-Al Alloy

Chen

Shi

et al. 2019

Journal of Nanomaterials

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“…In contrast, the Ω A-B and T c values of 16628 J/mol are close to those in Fe-Cr alloys. The minimum value of modulation wavelength for the A-B alloy shows a good agreement with those reported in the literature for Fe-Cr alloys 16,17 . Finally, the morphology prediction of the decomposed phases corresponds to that reported in the literature.…”

Section: Comparison With Actual Alloy Systemssupporting

confidence: 89%

“…For instance, the phase decomposition in Fe-Cr alloys occurs at higher temperatures 6 and the phase decomposition process is much more rapid than that observed in Cu-Ni alloys. Table 2 shows a comparison of simulated results, the modulation wavelength and morphology of decomposed phases, for the present work using nonlinear equation with other simulated and experimental results for Cu-Ni and Fe-Cr alloys [14][15][16][17] . The simulation results corresponding to Ω A-B values of 8314 and 12471 J/mol have the T c temperature of the miscibility gap located at temperatures between 500 and 750 K. This temperature range is close to that of the miscibility gap in Cu-Ni alloys [14][15] .…”

Section: Comparison With Actual Alloy Systemsmentioning

confidence: 99%

Numerical analysis of phase decomposition in A-B binary alloys using Cahn-Hilliard equations

Lezama-Alvarez¹,

Ávila-Dávila

López-Hirata³

et al. 2013

Mat. Res.

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The analysis of phase decomposition was carried out using the nonlinear and linear Cahn-Hilliard equations in a hypothetical A-B alloy system with a miscibility gap. These equations were solved by the explicit finite difference method assuming a regular solution model. The supersaturated solid solution and decomposed phases were considered to have an fcc structure. Different aging temperatures and thermodynamic interaction parameters Ω A-B were used to simulate different alloy systems. The numerical simulation results showed that the growth kinetics of phase decomposition in the alloy with 30at.% A was slower than that of 50 at.% A. Additionally, the start time and modulation wavelength of phase decomposition are strongly affected by the thermodynamic interaction parameter Ω A-B value. The numerical simulation results showed that the growth kinetics of phase decomposition with the linear equation is slower than that with the nonlinear one.

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“…The average radius of the a¢ phase is expected to increase continuously at the coarsening stage, as deduced from the variation tendency of the radius shown in . Therefore, the simulated morphologies and particle size of the a¢ phase in Fe-42 at.% Cr alloy aged at 700, 725, and 750 K are reasonable compared with the experimental results ( Ref 2,9,39,42). Figure 3 shows the variation of the volume fractions of the a¢ phase as a function of aging time for Fe-42 at.% Cr alloy aged at 700, 725, and 750 K. The volume fractions of the a¢ phase increase quickly at the initial stage, then transform into a slightly increasing state at t* = 168, 120, and 192 for 700, 725, and 750 K, respectively.…”

Section: Temporal Average Radius and Volume Fraction Of A¢ Phasesupporting

confidence: 79%

“…Because of its scientific and applied importance, the phase decomposition of Fe-Cr alloys has attracted much attention in recent years (Ref [6][7][8][9]. The phase decomposition in duplex stainless steel at 475°C and its effects on the fatigue and fracture were studied by Sahu et al (Ref 7).…”

Section: Introductionmentioning

confidence: 99%

Phase-Field Simulation of the Separation Kinetics of a Nanoscale Phase in a Fe-Cr Alloy

Liu

et al. 2016

J. of Materi Eng and Perform

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The separation of a Cr-enriched nanometer-scale a¢ phase can induce the embrittlement of Fe-Cr alloys at high temperature, and the separation kinetics of the a¢ phase determines its spatial morphology. The quantitative kinetics of the a¢ phase formed by spinodal decomposition was studied in a Fe-42 at.% Cr alloy by phase-field simulation at various aging temperatures; the temporal morphology, average particle radius, volume fraction, particle number density, and particle size distribution of a¢ phase were investigated. The results indicate that the coarsening rate of the a¢ phase increases with increasing aging temperature, and the particle number density shows a large slope in the coarsening stage at higher aging temperature. The particle size distribution also demonstrates faster growth and coarsening rates of the a¢ phase at higher aging temperature. The mutual effects of supercooling and diffusion during phase decomposition result in a highest decomposition rate at 725 K than that of 700 and 750 K in the Fe-42 at.% Cr alloy. The simulation results of the kinetics of the Cr-enriched a¢ phase provide a basic understanding of the thermal aging and morphology evolution of Fe-Cr alloys.

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Phase decomposition in an Fe-40at.% Cr alloy after isothermal aging and its effect on hardening

Cited by 20 publications

References 8 publications

Quantitative Phase-Field Simulation of Composition Partition and Separation Kinetics of Nanoscale Phase in Fe-Cr-Al Alloy

Quantitative Phase-Field Simulation of Composition Partition and Separation Kinetics of Nanoscale Phase in Fe-Cr-Al Alloy

Numerical analysis of phase decomposition in A-B binary alloys using Cahn-Hilliard equations

Phase-Field Simulation of the Separation Kinetics of a Nanoscale Phase in a Fe-Cr Alloy

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