Improvements in spinodal alloys from past to present

Fındık, Fehim

doi:10.1016/j.matdes.2012.05.039

Cited by 115 publications

(51 citation statements)

References 111 publications

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“…A number of investigations were carried out on the spinodal decomposition in Cu-Ni-Cr alloys in the composition range of the miscibility gap [26][27][28][29][30] and discontinues precipitation reaction were observed after long time aging of these alloys. [26,27,30] According to, [27] the microstructural heterogeneity appears to derive primarily from relatively rapid loss of coherency of precipitate particles at GB and preferential growth or coarsening of these particles at the expense of the coherent particles within grains.…”

Section: B Spinodal Decomposition and Discontinues Precipitationmentioning

confidence: 99%

“…[26,27,30] According to, [27] the microstructural heterogeneity appears to derive primarily from relatively rapid loss of coherency of precipitate particles at GB and preferential growth or coarsening of these particles at the expense of the coherent particles within grains. The coarse precipitate structure triggers the migration of certain boundaries and a discontinuous coarsening (DC) reaction involves the migration of high-angle GB and boundary diffusion, similar to cellular precipitation.…”

Section: B Spinodal Decomposition and Discontinues Precipitationmentioning

confidence: 99%

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The Effect of the Rate of Cooling from High-Temperature Single-Phase Region on the Microstructure and Magnetic Properties of AlNi Alloys

Menushenkov

Savchenko

Жуков

2014

Metall Mater Trans A

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The microstructure of as-cast and melt spun AlNi alloys was studied by transmission (TEM) and scanning electron microscopy as well as atomic force microscopy (AFM). The magnetic properties of the alloys were measured using a vibrating sample magnetometer. The water quenched and melt spun AlNi samples were characterized by zone microstructure formed as a result of solid solution decomposition into b-and b 2 phases within the miscibility gap. Therefore, the subsequent aging of as-quenched alloy leads to the development of the zone microstructure instead of the decomposition of single-phase solid solution. The absence of preferential precipitations and discontinuous precipitation (DP) reaction was observed at grain boundaries (GB) of as-cast AlNi alloy after aging. The antiphase domains (APD) have been observed for the first time in the AlNi ribbons prepared by melt spinning. The effects of GB and APD boundaries on the decomposition of a solid solution in the AlNi ribbons were investigated. At first, a thin b-phase layer is formed along GB and APD boundaries. Then the decomposition leads to the formation of b 2 -phase layers on the both sides of b-phase layer. The GB and APD boundaries, which are decorated by precipitates of b-and b 2 layers, become visible in the TEM and AFM micrographs. A DP reaction at GBs has been observed for the first time in the AlNi ribbons after supplementary aging. The cellular microstructure at GBs consisting of alternating lamellas of b¢-and b¢ 2 phases was formed after aging the ribbons at 773 K (500°C) for 10 minutes.

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Section: B Spinodal Decomposition and Discontinues Precipitationmentioning

confidence: 99%

Section: B Spinodal Decomposition and Discontinues Precipitationmentioning

confidence: 99%

The Effect of the Rate of Cooling from High-Temperature Single-Phase Region on the Microstructure and Magnetic Properties of AlNi Alloys

Menushenkov

Savchenko

Жуков

2014

Metall Mater Trans A

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“…Most of the studies in the literature focus on the rather late stages of phase decomposition, when the embrittlement is already severe, and today it is still considered a major challenge to quantitatively characterize the nanostructure in technically relevant cases, when the length-scale is in the order of a few atomic distances and the concentration variations between a and a¢ are only a few atomic percent. [3,27,35] The purpose of the present work is to compare and discuss currently available experimental methodologies for structural characterization of phase separation in Fe-Cr alloys. In prior work, some of the present authors have presented APT and TEM studies of phase separation in binary Fe-Cr alloys exposed to aging at 773 K (500°C).…”

Section: Introductionmentioning

confidence: 99%

Structural Characterization of Phase Separation in Fe-Cr: A Current Comparison of Experimental Methods

Odqvist

Colliander

et al. 2016

Metall Mater Trans A

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Self-assembly due to phase separation within a miscibility gap is important in numerous material systems and applications. A system of particular interest is the binary alloy system Fe-Cr, since it is both a suitable model material and the base system for the stainless steel alloy category, suffering from low-temperature embrittlement due to phase separation. Structural characterization of the minute nano-scale concentration fluctuations during early phase separation has for a long time been considered a major challenge within material characterization. However, recent developments present new opportunities in this field. Here, we present an overview of the current capabilities and limitations of different techniques. A set of Fe-Cr alloys were investigated using small-angle neutron scattering (SANS), atom probe tomography, and analytical transmission electron microscopy. The complementarity of the characterization techniques is clear, and combinatorial studies can provide complete quantitative structure information during phase separation in Fe-Cr alloys. Furthermore, we argue that SANS provides a unique in-situ access to the nanostructure, and that direct comparisons between SANS and phase-field modeling, solving the non-linear Cahn Hilliard equation with proper physical input, should be pursued.

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“…Moreover, Findik et al [16][17][18][19][20][21] and Lei et al [22] considered the spinodal decomposition and discrete dynamical model to study the thermodynamic energy of metal materials, achieving some interesting results. Currently, a thorough research study on the surface-atom-bond contraction model based on surface tension, surface stress, and elastic modulus has not yet been proposed.…”

Section: Introductionmentioning

confidence: 99%

Effects of grain size and thermodynamic energy on the lattice parameters of metallic nanomaterials

Rong

Zhan

et al. 2015

Materials & Design

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Improvements in spinodal alloys from past to present

Cited by 115 publications

References 111 publications

The Effect of the Rate of Cooling from High-Temperature Single-Phase Region on the Microstructure and Magnetic Properties of AlNi Alloys

The Effect of the Rate of Cooling from High-Temperature Single-Phase Region on the Microstructure and Magnetic Properties of AlNi Alloys

Structural Characterization of Phase Separation in Fe-Cr: A Current Comparison of Experimental Methods

Effects of grain size and thermodynamic energy on the lattice parameters of metallic nanomaterials

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