Thermally activated precipitation at deformation-induced defects in Fe-Cu and Fe-Cu-B-N alloys studied by positron annihilation spectroscopy

He, Shiwei; Dijk, Niels van; Schüt, H.; Peekstok, E.R.; Zwaag, Sybrand van der

doi:10.1103/physrevb.81.094103

Cited by 65 publications

(29 citation statements)

References 41 publications

(54 reference statements)

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“…For comparison, complementary hardness tests and transmission electron microscope ͑TEM͒ observations have been performed. The results are compared to earlier positron annihilation spectroscopy measurements 30 performed on the same alloys.…”

Section: Introductionmentioning

confidence: 71%

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In situdetermination of aging precipitation in deformed Fe-Cu and Fe-Cu-B-N alloys by time-resolved small-angle neutron scattering

Dijk

Paladugu

et al. 2010

Phys. Rev. B

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We performed in situ time-resolved small-angle neutron scattering ͑SANS͒ measurements on high-purity Fe-Cu and Fe-Cu-B-N alloys during isothermal aging at 550°C in order to study the potential self-healing of deformation-induced defects by nanosized Cu precipitation. Three different samples with 0%, 8%, and 24% prestrain were used to study the influence of variable defect levels on the Cu precipitation kinetics. The time-resolved SANS measurements show the presence of two contributions corresponding to spherical precipitates and precipitation at dislocations and/or interfaces, as confirmed by complementary transmission electron microscopy experiments. For the Fe-Cu alloy, prestrain was found to accelerate the formation of spherical precipitates in initial aging stage and lead to a significant enhancement of copper precipitation at dislocations and/or interfaces. For the Fe-Cu-B-N alloy, the addition of boron and nitrogen accelerates the formation of spherical precipitates but suppresses the precipitation along dislocations in the prestrained samples.

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Section: Introductionmentioning

confidence: 71%

“…The transition from coherent to partially incoherent Cu clusters is in good agreement with recent positron annihilation spectroscopy results. 30 …”

Section: Discussionmentioning

confidence: 99%

In situdetermination of aging precipitation in deformed Fe-Cu and Fe-Cu-B-N alloys by time-resolved small-angle neutron scattering

Dijk

Paladugu

et al. 2010

Phys. Rev. B

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“…In our previous work on Fe-Cu and Fe-Cu-B-N model alloys, Cu precipitation at deformation-induced structural defects was indeed found to take place. [16,17] However, the preference for Cu and BN to precipitate at open deformation-induced defects was found to be relatively weak and a high concentration of spherical Cu precipitates was formed homogeneously in the matrix, greatly reducing the healing potential of the Cu atoms initially brought into a supersaturated state.…”

Section: Introductionmentioning

confidence: 99%

Autonomous Filling of Grain-Boundary Cavities during Creep Loading in Fe-Mo Alloys

Zhang

Fang

Gramsma

et al. 2016

Metall Mater Trans A

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We have investigated the autonomous repair of creep damage by site-selective precipitation in a binary Fe-Mo alloy (6.2 wt pct Mo) during constant-stress creep tests at temperatures of 813 K, 823 K, and 838 K (540°C, 550°C, and 565°C). Scanning electron microscopy studies on the morphology of the creep-failed samples reveal irregularly formed deposits that show a close spatial correlation with the creep cavities, indicating the filling of creep cavities at grain boundaries by precipitation of the Fe 2 Mo Laves phase. Complementary transmission electron microscopy and atom probe tomography have been used to characterize the precipitation mechanism and the segregation at grain boundaries in detail.

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“…In our previous work, copper precipitation was indeed observed at open-volume defects in solutionized Fe-Cu and Fe-Cu-B-N model alloys. [14][15][16] However, Cu precipitation at deformation-induced defects was found to be relatively weak as spherical Cu precipitates are simultaneously formed inside the matrix.…”

Section: Introductionmentioning

confidence: 99%

Autonomous Repair Mechanism of Creep Damage in Fe-Au and Fe-Au-B-N Alloys

Zhang

Kwakernaak

Tichelaar

et al. 2015

Metall Mater Trans A

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The autonomous repair mechanism of creep cavitation during high-temperature deformation has been investigated in Fe-Au and Fe-Au-B-N alloys. Combined electron-microscopy techniques and atom probe tomography reveal how the improved creep properties result from Au precipitation within the creep cavities, preferentially formed on grain boundaries oriented perpendicular to the applied stress. The selective precipitation of Au atoms at the free creep cavity surface results in pore filling, and thereby, autonomous repair of the creep damage. The large difference in atomic size between the Au and Fe strongly hampers the nucleation of precipitates in the matrix. As a result, the matrix acts as a reservoir for the supersaturated solute until damage occurs. Grain boundaries and dislocations are found to act as fast transport routes for solute gold from the matrix to the creep cavities. The mechanism responsible for the self-healing can be characterized by a simple model for cavity growth and cavity filling.

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Thermally activated precipitation at deformation-induced defects in Fe-Cu and Fe-Cu-B-N alloys studied by positron annihilation spectroscopy

Cited by 65 publications

References 41 publications

In situdetermination of aging precipitation in deformed Fe-Cu and Fe-Cu-B-N alloys by time-resolved small-angle neutron scattering

In situdetermination of aging precipitation in deformed Fe-Cu and Fe-Cu-B-N alloys by time-resolved small-angle neutron scattering

Autonomous Filling of Grain-Boundary Cavities during Creep Loading in Fe-Mo Alloys

Autonomous Repair Mechanism of Creep Damage in Fe-Au and Fe-Au-B-N Alloys

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