Initiation and growth of the discontinuous precipitation reaction at [0 1 1] symmetric tilt boundaries in Cu–Be alloy bicrystals

Monzen, Ryoichi; Watanabe, Chihiro; Mino, D.; Saida, S.

doi:10.1016/j.actamat.2004.11.019

Cited by 37 publications

(21 citation statements)

References 27 publications

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“…About 50 grain boundaries in each of the Cu-Be-Co and 0.01 and 0.03%Mg-added alloys aged at 320°C for 30 min were observed using TEM. Similar to our previous observation [13], precipitation of the phase took place first at grain boundaries and then the boundaries migrated. DP cells were formed for about 100, 80 and 50% of the boundaries examined in the Cu-Be-Co and 0.01 and 0.03wt.%Mg-added alloys, indicating that the addition of Mg suppresses the formation of cells.…”

Section: Effect Of Mg On Strengthsupporting

confidence: 70%

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Bend formability and strength of Cu–Be–Co alloys

et al. 2011

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Section: Effect Of Mg On Strengthsupporting

confidence: 70%

“…The first critical step of the DP reaction in Cu-Be alloys is heterogeneous grain 7 boundary nucleation [12,13]. About 50 grain boundaries in each of the Cu-Be-Co and 0.01 and 0.03%Mg-added alloys aged at 320°C for 30 min were observed using TEM.…”

Section: Effect Of Mg On Strengthmentioning

confidence: 99%

Bend formability and strength of Cu–Be–Co alloys

et al. 2011

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“…The first critical step of the DP reaction in Cu-Be alloys is heterogeneous grain-boundary nucleation [11,12]. Similar to our previous observation [12], boundary precipitation of the γ phase occurred before any significant boundary migration.…”

Section: Precipitation Morphologysupporting

confidence: 75%

“…The DP cell in Cu-Be alloys consists of lamellae of the equilibrium γ phase (CuBe intermetallic) and solute-depleted α phase (Cu-rich solid solution). Rod-shaped precipitates of the γ phase in DP cells exhibit an orientation relationship to Cu matrix of the α phase [10][11][12]. We have found that the growth rate of DP cells depends on the sense (tension or compression) of the applied stress, and the growth rates in the loading and the transverse directions are identical, different from the previous observations [3,4,6,7,9].…”

Section: Introductioncontrasting

confidence: 55%

Effect of external stress on discontinuous precipitation in a Cu–2.1 wt % Be alloy

Monzen¹,

Hasegawa²,

Watanabe³

2010

Philosophical Magazine

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The influence of an applied stress on discontinuous precipitation (DP) in a Cu-2.1wt%Be alloy aged at 300ºC has been examined. A compressive stress accelerates the growth of DP cells, consisting of lamellae of the precipitated γ phase and the solute-depleted α phase, but a tensile stress does not essentially change it. The cell growth rates along the loading direction under the compressive and tensile stress are identical to those along the direction perpendicular to the loading direction under the same. Both the compressive and tensile stress have no influence on the incubation time to initiate DP. From measurements of the specimen length-change and investigations of the distribution of γ variants in cells in a particular case, specific γ variants among crystallographically equivalent ones are found to be formed, depending on the sense of the applied stress. This result, together with the dependence of the cell growth rate on the sense of the applied stress, can be well understood through the interaction energy between the external stress and the misfit strains of discontinuous γ precipitates.

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“…The dependence between misorientation angle and incubation period and cell growth velocity for the DP reaction at [011] symmetric tilt boundaries in Cu-0.75wt% Be alloy bicrystals was studied by Monzen [37] using TEM technique. Lower-energy boundaries were found to exhibit a longer incubation period and a slower growth rate.…”

Section: Relation To Gb Orientationmentioning

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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Initiation and growth of the discontinuous precipitation reaction at [0 1 1] symmetric tilt boundaries in Cu–Be alloy bicrystals

Cited by 37 publications

References 27 publications

Bend formability and strength of Cu–Be–Co alloys

Bend formability and strength of Cu–Be–Co alloys

Effect of external stress on discontinuous precipitation in a Cu–2.1 wt % Be alloy

Recent Developments on Discontinuous Precipitation

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