Dynamic grain growth during superplastic deformation

Rabinovich, M. Kh.; Trifonov, V. G.

doi:10.1016/1359-6454(95)00263-4

Cited by 62 publications

(23 citation statements)

References 10 publications

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“…This grain growth phenomenon in ultrafine-grained Zn-22 wt.%Al alloy during ECAP, is also well reported during superplastic deformation. This strain-induced grain growth [21] during superplastic deformation generally leads to strain hardening and adds to high strain-rate sensitivity, may provide a superplastic alloy an increased resistance to strain localization and result in higher ductility. It is also another reason for excellent superplastic property of samples processed by Route 2 at room temperature.…”

Section: Discussionmentioning

confidence: 98%

Improvement of room-temperature superplasticity in Zn–22wt.%Al alloy

Xia

Wang

et al. 2008

Materials Science and Engineering: A

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Section: Discussionmentioning

confidence: 98%

Improvement of room-temperature superplasticity in Zn–22wt.%Al alloy

Xia

Wang

et al. 2008

Materials Science and Engineering: A

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“…This type of timedependent superplastic deformation-enhanced grain growth has been observed in a number of other alloys. [25][26][27][28][29] Since grain growth during superplastic deformation may cause transition to power law deformation, this aspect of structural evolution should be accounted for in the superplasticity model; superplasticity-enhanced grain growth in Rene´88DT will be described in a future publication.…”

Section: Discussionmentioning

confidence: 99%

Deformation and Strain Storage Mechanisms during High-Temperature Compression of a Powder Metallurgy Nickel-Base Superalloy

Pollock

2010

Metall Mater Trans A

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High-temperature compression testing combined with high-resolution electron backscatter diffraction (EBSD) analysis has been used to study microstructural-scale straining processes that occur during high-temperature deformation of a powder-consolidated nickel-base superalloy, Rene´88DT (GE Aviation, Evendale, OH). Orientation imaging has been employed to study grain-level straining and strain storage at temperatures between 1323 K (1050°C) and 1241 K (968°C) for strain rates between 0.1/s and 0.00032/s at nominal strain levels between 0.1 and 0.7. Two distinct deformation mechanisms were observed. At strain rates below 0.01/s, superplastic deformation dominates, while power-law creep occurs during high rate compression. Stored strain and evolution of the grain structure during deformation are dependent on strain rate during compression. At low strain rates in the superplastic regime, low levels of stored strain and some grain growth are observed. At high strain rates, dynamic recrystallization occurs along with higher levels of stored strain within selected grains, particularly those at the high end of the grain size distribution. A constitutive model for superplastic deformation was employed to predict the temperature and strain rate dependence of the transition from superplastic to power law deformation. The transition in rate sensitivity was consistent with the transition in stored strain measured by EBSD. Superplasticity-enhanced grain growth is observed and the implications for the transition in deformation mechanisms are discussed.

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“…[14] In addition, the order of magnitude increase in grain size was larger than has been attributed to dynamic grain growth in other studies during elevated temperature deformation. [22] Third, abnormal grain growth of the original grain structure is ruled out as a possibility, as one of the criteria for abnormal grain growth to occur is that at least one initial grain be significantly larger than the average grain size. [23] Such grains were not found in these materials.…”

Section: Discussionmentioning

confidence: 99%

Dynamic Recrystallization of AA5083 at 450 °C: the Effects of Strain Rate and Particle Size

Agarwal

Krajewski

Briant

2008

Metall Mater Trans A

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This article presents a study of the dynamic recrystallization that occurs when AA5083 is deformed at elevated temperatures and strain rates typical of those observed in quick plastic forming (QPF). Strain rates between 0.0005 and 0.3/s were used for these tests, which were performed with the samples at 450°C. The results showed that for strain rates at or below 0.01/s, no recrystallization occurred. At higher strain rates, recrystallization did occur in the most highly strained regions of the sample. The recrystallized grain size was smallest at the highlystrained fracture point and increased in size as one moved away from the fracture end toward the grip of the sample. Below a critical strain, no further recrystallization was observed. This critical strain decreased with increasing strain rate and with an increase in the diameter of the largest constituent particles in the sample. Analysis of the results showed that both a critical strain rate and critical strain were required to achieve dynamic recrystallization. Humphrey's model for critical strain rate gave qualitative agreement with experimental results, but the fact that the strain rate in the necked region of the sample increases above the nominal strain rate made a more detailed comparison with the model difficult.

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Dynamic grain growth during superplastic deformation

Cited by 62 publications

References 10 publications

Improvement of room-temperature superplasticity in Zn–22wt.%Al alloy

Improvement of room-temperature superplasticity in Zn–22wt.%Al alloy

Deformation and Strain Storage Mechanisms during High-Temperature Compression of a Powder Metallurgy Nickel-Base Superalloy

Dynamic Recrystallization of AA5083 at 450 °C: the Effects of Strain Rate and Particle Size

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