Atomic-scale APFIM and TEM investigation of grain boundary microchemistry in Astroloy nickel base superalloys

Blavette, D.; Duval, P.; Letellier, L.; Guttmann, M.

doi:10.1016/s1359-6454(96)00087-0

Cited by 135 publications

(42 citation statements)

References 16 publications

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“…This latter phenomenon has been widely investigated in numerous alloys because of its dramatic influence on the mechanical behaviour (creep, toughness or ductility). For example, it has been reported that in Al alloys Mg may segregate along grain boundaries [44][45][46], similar features were observed for Si, P and C in bcc Fe [47], while B exhibits the same behaviour in Ni 3 Al [48], FeAl [49], but was also detected along /" heterophase interfaces in superalloys [50]. Moreover, small quantities of residual impurities (especially of strongly segregating ones like P, S or C in Cu or Ni) can significantly modify GB diffusivities even at the ppm level [51,52].…”

Section: Spd Induced Gb Segregationmentioning

confidence: 57%

Grain boundaries in ultrafine grained materials processed by severe plastic deformation and related phenomena

Sauvage

Wilde

Divinski

et al. 2012

Materials Science and Engineering: A

489

219

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Grain boundaries in ultrafine grained (UFG) materials processed by severe plastic deformation (SPD) are often called "non-equilibrium" grain boundaries. Such boundaries are characterized by excess grain boundary energy, presence of long range elastic stresses and enhanced free volumes. These features and related phenomena (diffusion, segregation, etc.) have been the object of intense studies and the obtained results provide convincing evidence of the importance of a non-equilibrium state of high angle grain boundaries for UFG materials with unusual properties. The aims of the present paper are first to give a short overview of this research field and then to consider tangled, yet unclear issues and outline the ways of oncoming studies. A special emphasis is given on the specific structure of grain boundaries in ultrafine grained materials processed by SPD, on grain boundary segregation, on interfacial mixing linked to heterophase boundaries and on grain boundary diffusion. The connection between these unique features and the mechanical properties or the thermal stability of the ultrafine grained alloys is also discussed.

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Section: Spd Induced Gb Segregationmentioning

confidence: 57%

Grain boundaries in ultrafine grained materials processed by severe plastic deformation and related phenomena

Sauvage

Wilde

Divinski

et al. 2012

Materials Science and Engineering: A

489

219

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“…Blavette et al [34] used electron microscopy and atom probe techniques to investigate GB microchemistry in the Ni-base superalloy Astroloy (alloying system Ni-Co-CrMo-Al-Ti-Zr-B-C). Atom probe tomography revealed the presence of B, Mo and Cr at GBs, which agrees well with our theoretical predictions.…”

Section: Chemistry Of Interfaces In Ni-base Alloysmentioning

confidence: 99%

First-principles-aided design of a new Ni-base superalloy: Influence of transition metal alloying elements on grain boundary and bulk cohesion

2015

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“…The analysis was performed with the tomographic atom probe at the University of Göttingen, Germany, which was build around a detector system developed at the University of Rouen. 13,14 Detailed descriptions of the atom probe tomography principle are presented. 15,16 For the threedimensional AP analysis, suitable measurement conditions were found at a pulse rate of 2 kHz, a pulse fraction U dc /U pulse D 25% and a specimen temperature of 40 K.…”

Section: Methodsmentioning

confidence: 99%

Thermal reaction and stability of NiFe/Cu thin films investigated by atom probe tomography

Ene¹,

Schmitz

Kirchheim³

et al. 2007

Surface & Interface Analysis

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NiFe/Cu multilayer stacks of 2 nm single layer thickness were deposited onto needle-shaped W tips by ion beam sputtering and analysed by atom probe tomography (TAP) after appropriate heat treatments. After annealing at 250°C for 30 min, no significant structural or chemical transformation of the initial layer system is detected, although such a heat treatment appreciably reduces the magneto resistivity. A slight decrease of the concentration slope at the interfaces is attributed to a very short-range interdiffusion. Clear grain boundary diffusion is observed after annealing at 400°C for 30 min. Further annealing at 500°C for 20 min and 40 min still preserves the layered structure with a homogeneous solution of Ni inside the Cu layers of up to 25 at.% Ni.

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Atomic-scale APFIM and TEM investigation of grain boundary microchemistry in Astroloy nickel base superalloys

Cited by 135 publications

References 16 publications

Grain boundaries in ultrafine grained materials processed by severe plastic deformation and related phenomena

Grain boundaries in ultrafine grained materials processed by severe plastic deformation and related phenomena

First-principles-aided design of a new Ni-base superalloy: Influence of transition metal alloying elements on grain boundary and bulk cohesion

Thermal reaction and stability of NiFe/Cu thin films investigated by atom probe tomography

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