Thermo-mechanical factors influencing annealing twin development in nickel during recrystallization

Jin, Yuan; Bo, Lin; Rollett, Anthony D.; Rohrer, Gregory S.; Bernacki, Marc; Bozzolo, Nathalie

doi:10.1007/s10853-015-9067-0

Cited by 53 publications

(26 citation statements)

References 30 publications

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“…This initial microstructure results from the prior recrystallization process. It has been established that the twin density after recrystallization is mainly controlled by the stored energy level [13,14] and that the twin formation event occurs more often when the grains are growing faster [9,15]. The migration rate of the recrystallization front decreases during the recrystallization process because the remaining stored energy level in the deformed matrix is decreasing.…”

Section: Experimental Results and Discussion Of The Underlying Mechanmentioning

confidence: 99%

“…In the grain growth regime, small grains containing several twin boundaries are consumed by large grains, which grow, but only very rarely produce new twins. A new mesoscopic model, which relates annealing twin formation to the topology of the moving grain boundaries, was proposed in [13,15,16] to explain this phenomenon. According to this model, coherent twins can nucleate only along grain boundary segments that migrate opposite to their curvature.…”

Section: Experimental Results and Discussion Of The Underlying Mechanmentioning

confidence: 99%

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Evolution of the Annealing Twin Density during δ-Supersolvus Grain Growth in the Nickel-Based Superalloy Inconel™ 718

Jin

Bernacki

Agnoli

et al. 2015

Metals

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Abstract:Grain growth experiments were performed on Inconel™ 718 to investigate the possible correlation of the annealing twin density with grain size and with annealing temperature. Those experiments were conducted at different temperatures in the δ supersolvus domain and under such conditions that only capillarity forces were involved in the grain boundary migration process. In the investigated range, there is a strong inverse correlation of the twin density with the average grain size. On the other hand, the twin density at a given average grain size is not sensitive to annealing temperature. Consistent with previous results for pure nickel, the twin density evolution in Inconel™ 718 is likely to be mainly controlled by the propagation of the pre-existing twins of the growing grains; i.e., the largest ones of the initial microstructure. Almost no new twin boundaries are created during the grain growth process itself. Therefore, the twin density at a given average grain size is mainly dependent on the twin density in the largest grains of the initial microstructure and independent of the temperature at which grains grow. Based on the observations, a mean field model is proposed to predict annealing twin density as a function of grain size during grain growth.

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Section: Experimental Results and Discussion Of The Underlying Mechanmentioning

confidence: 99%

Section: Experimental Results and Discussion Of The Underlying Mechanmentioning

confidence: 99%

Evolution of the Annealing Twin Density during δ-Supersolvus Grain Growth in the Nickel-Based Superalloy Inconel™ 718

Jin

Bernacki

Agnoli

et al. 2015

Metals

View full text Add to dashboard Cite

show abstract

“…In metals having fcc lattice with low-to-medium stacking fault energy (SFE), the population of special (CSL) boundaries is dominated by the R3 and related R3 2 (R9) and R3 3 (R27) GBs [44,59,60]. For example, the coherent twin typically accounts for 10-50 % of the grain boundary area in an annealed fcc polycrystal [61].…”

Section: Faceting-roughening Of Twin (R 5 3) Grain Boundaries In Coppermentioning

confidence: 99%

Review: grain boundary faceting–roughening phenomena

et al. 2015

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Similar to free surfaces, the grain boundaries (GBs) in metals, semiconductors and insulators can contain flat (faceted) and curved (rough) portions. In the majority of cases, facets are parallel to the most densely packed planes of coincidence sites lattice formed by two lattices of abutting grains. Facets disappear with the increasing temperature (faceting-roughening transition) and the increasing angular distance from coincidence misorientation. The temperature of GB faceting-roughening transition T R decreases with the increasing inverse density of coincidence sites R. In case of fixed R, T R decreases with the decreasing density of coincidence sites in the GB plane.The intersection line (ridge) between facets or between facets and curved (rough) portions of surfaces can be of first order (two different tangents in the contact point) or of second order (common tangent, continuous transitions). The rough (curved) portions of GB can also form the firstorder rough-to-rough ridges (with two tangents). GB facets control the transition from normal to abnormal grain growth and strongly influence the GB migration, diffusion, wetting, fracture and electrical conductivity.

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“…Their conclusions were reaffirmed by later transmission electron microscopy (TEM) observations showing how strain-induced boundary migration introduces twins during GB engineering [100]. More recently, the effects of prior deformation and heat treatment on recrystallization twinning were quantified by Jin et al [180].…”

Section: Introductionmentioning

confidence: 88%

Local Crystallographic Orientation Correlation Measurements Connecting the Processing and Properties of Face-Centered Cubic Metals

Bober

2017

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Thermo-mechanical factors influencing annealing twin development in nickel during recrystallization

Cited by 53 publications

References 30 publications

Evolution of the Annealing Twin Density during δ-Supersolvus Grain Growth in the Nickel-Based Superalloy Inconel™ 718

Evolution of the Annealing Twin Density during δ-Supersolvus Grain Growth in the Nickel-Based Superalloy Inconel™ 718

Review: grain boundary faceting–roughening phenomena

Local Crystallographic Orientation Correlation Measurements Connecting the Processing and Properties of Face-Centered Cubic Metals

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