Mechanism of twinning-induced grain boundary engineering in low stacking-fault energy materials

Randlè, Valerie

doi:10.1016/s1359-6454(99)00277-3

Cited by 377 publications

(155 citation statements)

References 18 publications

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“…1 These interfaces typically show lower grain boundary energies compared to those of low-CSL boundaries and HAGBs [15,16]. Coherent twin or Σ3 boundaries are the most prevalent type of special grain boundaries [17] and possess the lowest grain boundary energy [16]. Therefore, they are highly desirable features for breaking up the connectivity of the random grain boundary network.…”

Section: Introductionmentioning

confidence: 99%

Tailoring the Properties of a Ni-Based Superalloy via Modification of the Forging Process: an ICME Approach to Fatigue Performance

Detrois

Rotella

Hardy

et al. 2017

Integr Mater Manuf Innov

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Traditionally, material design and property modifications are usually associated with compositional changes. Yet, subtle changes in the manufacturing process parameters can also have a dramatic effect on the resulting material properties. In this work, an integrated computational materials engineering (ICME) framework is adopted to tailor the fatigue performance of a Ni-based superalloy, RR1000. An existing fatigue model is used to identify microstructural features that promote enhanced fatigue life, namely a uniform, fine grain size distribution, random orientation, a distinct grain boundary distribution (specifically high twin boundary density and limited low-angle grain boundaries). A deformation mechanism map and process models for grain boundary engineering of RR1000 are used to identify the optimal thermo-mechanical processing parameters to realize these desirable microstructural features. For validation, small-scale forgings of RR1000 were produced and heat-treated to attain fine grain and coarse grain microstructures that represent the conventionally processed and grain boundary engineered (GBE) conditions, respectively. For each of the four microstructural variants of RR1000, the twin density and grain size were characterized and were in agreement with the desired microstructural attributes. In order to validate the deformation mechanisms and fatigue behavior of the material, high-resolution digital image correlation was performed to generate strain maps relative to the microstructural features. The high density of twin boundaries was confirmed to inhibit the length of slip bands, which is directly attributed to extended fatigue life. Thus, this study demonstrated the successful role of models, both process and performance, in the design and manufacture of Ni-based superalloy disk forgings.

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Section: Introductionmentioning

confidence: 99%

Tailoring the Properties of a Ni-Based Superalloy via Modification of the Forging Process: an ICME Approach to Fatigue Performance

Detrois

Rotella

Hardy

et al. 2017

Integr Mater Manuf Innov

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“…of low-GBs is surprisingly high [7][8][9][10][11]. The number of low-GBs exceeds the theoretical value for a random polycrystal, derived by Mackenzie [12].…”

Section: Introductionmentioning

confidence: 99%

Faceting of the Σ 3 coincidence tilt boundary in Nb

et al. 2005

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Due to their unusual properties, the grain boundaries (GBs) with the lowest possible inverse density of coincidence sites = 3 play a special role in the GB engineering. The as-grown shape of the cylindric tilt grain boundary (GB) in Nb bicrystal grown by the floating zone method has been studied with the electron back-scattering diffraction method. Both grains form the superlattice called coincidence site lattice (CSL) with the lowest possible inverse density of coincidence sites = 3. Four different CSL facets (100) 3CSL , {110} 3CSL , {120} 3CSL and {210} 3CSL were observed simultaneously. Flat facets (100) 3CSL , {110} 3CSL , {120} 3CSL and {210} 3CSL form smooth edges (no slope discontinuity) with rounded rough GB portions. Rough surface curves away from the plane of the (-1, 2, 0) 3CSL facet at the edge with (-1, 1, 0) 3CSL facet as x β with β = 1.61 ± 0.09. At the edge between (210) 3CSL and (-1, 2, 0) 3CSL facets β = 1.46 ± 0.09. Both values reveal the GB roughening belonging to the Pokrovsky-Talapov universality class. It has been shown for Pb surfaces [K. Arenhold, S. Surnev, P. Coenen, H.P. Bonzel and P. Wynblatt, Surf. Sci. 417 (1998) L1160] that the β value depend on the details of the steps interaction at the vicinal surface. In our case the difference between measured β for two different facet edges can be due to the similar details of GB steps. C 2005 Springer Science + Business Media, Inc.

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“…Σ3 + Σ3 = Σ9 [41]. With the onset of deformation at ε = 0.23, a reduction in the HAGB, THAGB, Σ3 and Σ9 fractions is seen; following which they all exhibit a gradual increase at higher strains (Fig.…”

Section: Microstructure Evolution With Dynamic Recrystallisationmentioning

confidence: 87%

Microstructure and micro-texture evolution during the dynamic recrystallisation of a Ni-30Fe-Nb-C model alloy

Mannan

Saleh

Gazder

et al. 2016

Journal of Alloys and Compounds

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Pereloma, E. V. (2016). Microstructure and micro-texture evolution during the dynamic recrystallisation of a Ni-30Fe-Nb-C model alloy. Journal of Alloys and Compounds, Microstructure and micro-texture evolution during the dynamic recrystallisation of a Ni-30Fe-Nb-C model alloy AbstractThe evolution of microstructure and micro-texture during discontinuous dynamic recrystallisation of an austenitic Ni-30Fe-Nb-C model alloy subjected to interrupted plane strain compression at strains (ε) of 0.23, 0.35, 0.68, 0.85 and 1.2 was investigated using electron backscattering diffraction and transmission electron microscopy. Throughout the strain range, the majority of dynamic recrystallisation events comprised nucleation in necklace-like arrangements located at and along grain boundaries via bulging. At ε ≥ 0.68, discrete nucleation events were also observed within grain interiors. Grain growth during dynamic recrystallisation is characteristic of strain induced boundary migration. The initial texture comprised Cube-RD ({013}〈100〉), Cube-ND ({001}〈310〉) and Cube ({001}〈100〉) orientations. Up to ε ≤ 0.35, the unrecrystallised grain fractions comprised the Brass ({110}〈112〉) or Copper ({112}〈111〉) orientations and an intensity spread near Rotated Goss ({011}〈011〉). Between 0.68 ≤ ε ≤ 1.2, the texture of the unrecrystallised grain fractions was similar to that of the recrystallised grains throughout the strain range; both of which are dominated by the Cube orientation. The dominance of the Cube orientation in the secondary deformed and recrystallised grains can be ascribed to its low stored energy and orientation stability.

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Mechanism of twinning-induced grain boundary engineering in low stacking-fault energy materials

Cited by 377 publications

References 18 publications

Tailoring the Properties of a Ni-Based Superalloy via Modification of the Forging Process: an ICME Approach to Fatigue Performance

Tailoring the Properties of a Ni-Based Superalloy via Modification of the Forging Process: an ICME Approach to Fatigue Performance

Faceting of the Σ 3 coincidence tilt boundary in Nb

Microstructure and micro-texture evolution during the dynamic recrystallisation of a Ni-30Fe-Nb-C model alloy

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