Some observations on deformation-related discontinuous precipitation in an Al-14.6at.%Zn alloy

Ng, Hoi-Pang; Bettles, Colleen Joyce; Muddle, Barrington Charles

doi:10.1016/j.jallcom.2010.10.167

Cited by 12 publications

(7 citation statements)

References 26 publications

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“…Ng et al [46] investigated the DP reaction in a supersaturated Al-14.6at.% Zn alloy in relation to different forms of deformation structures. The intense surface scribing, followed by short-term ageing at 338 K, resulted in a recrystallized duplex structure with nanoscale equiaxed beta-Zn particles and alpha-Al grains.…”

Section: Role Of External Stresses and Plastic Deformationmentioning

confidence: 99%

Recent Developments on Discontinuous Precipitation

Zięba¹

2017

Archives of Metallurgy and Materials

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The discontinuous precipitation (DP) belongs to a group of diffusive solid state phase transformations during which the formation of a new phase is heterogeneous and limited to a migrating reaction front (RF). The use of analytical electron microscopy provided reliable information that there is no differences in the diffusion rate at the stationary grain boundary and moving RF of DP reaction. On the other hand, the use of "in situ" transmission electron microscopy observations indicated the importance of stop-go motion or oscillatory movement of the RF.During 2004-2016 period more or less 280 papers were published in which the terms "discontinuous precipitation, "cellular precipitation", discontinuous coarsening" appeared either in the abstract or in key-words.In the present contribution, the research on the DP reaction will be reviewed taking into account new aspects of theories and modelling, new evidences and findings, effect of various factors including third element, external stresses, plastic deformation and GB orientation, occurrence in less known systems and alloys like: superalloys, nitrided Fe-based alloys and Cu-based alloys. Finally, some suggestions for the future research will be formulated.

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Section: Role Of External Stresses and Plastic Deformationmentioning

confidence: 99%

Recent Developments on Discontinuous Precipitation

Zięba¹

2017

Archives of Metallurgy and Materials

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“…[20] Variety of alloy systems showing discontinuous precipitation have been shown to respond differently in the presence of prior plastic deformation. [5,11,12,14,53] Table VI lists some more literature [15][16][17][18][19] on the effect of prior plastic deformation on the kinetics of the discontinuous precipitation. It is apparent that the prior plastic deformation affects every alloy system differently due to the variety of the mechanisms at play.…”

Section: Discussionmentioning

confidence: 99%

“…[7] The driving force for the growth of the discontinuous precipitation cells is a result of multiple factors such as the relaxation of the supersaturated lattice due to solute depletion, reduction of interfacial free energy by ways of precipitate formation and grain boundary migration and by the recovery of prior plastic deformation. [8][9][10] It has been shown in various experimental studies [5,[11][12][13][14][15][16][17][18][19] that prior plastic deformation has significant effects on the kinetics of discontinuous precipitation in a variety of alloys. However, the effects are seen to differ both in the nature as well as the magnitude depending on the particular alloy system.…”

Section: Introductionmentioning

confidence: 99%

“…[20] It has been shown that the strain fields surrounding the deformation induced defects and the continuous precipitates determine the mobility of the discontinuous precipitation cell boundary in an alloy with prior plastic deformation. [17] In the process of the continuous precipitation, those sites which have lower activation energies for nucleation show correspondingly higher rates of nucleation. As a result of the nucleation of a second phase particle (volume V and total surface area A), there is a change in the free energy, which may be represented as [21] :…”

Section: Introductionmentioning

confidence: 99%

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Effect of Prior Plastic Deformation on the α-Cr Precipitation in a Binary Ni-Cr Alloy

Keskar

Krishna

Tewari

2020

Metall Mater Trans A

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The effect of prior plastic deformation on the discontinuous precipitation in a supersaturated binary Ni-Cr alloy (42 wt pct Cr) was investigated. Solutionised samples were cold rolled to different extents of reduction (20, 50 and 70 pct) and then subjected to aging heat treatments in the temperature range of 923 K to 1123 K (650°C to 850°C) for different time periods, resulting in the precipitation of a-Cr in various morphologies. The a-Cr precipitates were in the form of lamellar discontinuous precipitation, acicular continuous precipitation along the deformation bands, globularization and equiaxed precipitation concurrently with matrix recrystallization. The volume fraction of each morphology varied according to the heat treatments. Overall, the prior plastic deformation had a retarding effect on the kinetics of discontinuous precipitation and accelerated the kinetics of continuous precipitation. The retardation of discontinuous precipitation was attributed to the loss of supersaturation of the matrix due to the other competing modes of precipitation supported by deformation. Plastic deformation prior to aging is shown to be a possible route for engineering the microstructure in this alloy.

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“…By considering a homogeneous dislocation distribution, the evolution of the average dislocation density (ρ) with strain (γ) can be described by: (4) where and are the dislocation storage and annihilation terms, respectively.…”

Section: Discussion and Modelingmentioning

confidence: 99%