<i>In situ</i>determination of aging precipitation in deformed Fe-Cu and Fe-Cu-B-N alloys by time-resolved small-angle neutron scattering

He, Shiwei; Dijk, Niels van; Paladugu, Mohanchand; Schüt, H.; Kohlbrecher, J.; Tichelaar, F.D.; Zwaag, Sybrand van der

doi:10.1103/physrevb.82.174111

Cited by 60 publications

(31 citation statements)

References 45 publications

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“…Previous TEM studies on similar model alloys (Fe-Cu, Fe-Cu-B-N, Fe-Au, and Fe-Au-B-N) did not reveal a high dislocation density for undeformed specimens that were heated to 823 K (550°C). [16][17][18]22] Precipitates are also present along grain boundaries, as shown in Figure 8(c). Some grain boundaries are completely covered with a thin film of the Fe 2 Mo phase (see Figure 8(d)).…”

Section: Transmission Electron Microscopymentioning

confidence: 95%

“…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%

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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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Section: Transmission Electron Microscopymentioning

confidence: 95%

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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“…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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“…Fe-Cu and Fe-Cu-B-N alloys 142 and the growth of nanocrystals in glass-ceramics 143 have all been investigated. A particular benefit of TR-SANS is the ability to separately visualize the organic template and the forming structure, both of which have a vital role in the growth mechanism.…”

Section: Time-resolved Sans (Tr-sans)mentioning

confidence: 99%

Practical applications of small-angle neutron scattering

Hollamby

2013

Phys. Chem. Chem. Phys.

120

116

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Recent improvements in beam-line accessibility and technology have led to small-angle neutron scattering (SANS) becoming more frequently applied to materials problems. SANS has been used to study the assembly, dispersion, alignment and mixing of nanoscale condensed matter, as well as to characterise the internal structure of organic thin films, porous structures and inclusions within steel.Using time-resolved SANS, growth mechanisms in materials systems and soft matter phase transitions can also be explored. This review is intended for newcomers to SANS as well as experts. Therefore, the basic knowledge required for its use is first summarised. After this introduction, various examples are given of the types of soft and hard matter that have been studied by SANS. The information that can be extracted from the data is highlighted, alongside the methods used to obtain it. In addition to presenting the findings, explanations are provided on how the SANS measurements were optimised, such as the use of contrast variation to highlight specific parts of a structure. Emphasis is placed on the use of complementary techniques to improve data quality (e.g. using other scattering methods) and the accuracy of data analysis (e.g. using microscopy to separately determine shape and size). This is done with a view to providing guidance on how best to design and analyse future SANS measurements on materials not listed below.

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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

Cited by 60 publications

References 45 publications

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

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

Practical applications of small-angle neutron scattering

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