Grain rearrangements during superplastic deformation

Gifkins, R. C.

doi:10.1007/bf00552899

Cited by 164 publications

(37 citation statements)

References 16 publications

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“…A high m value of about 0.5 was found in the strain rate range of 10 −4 -10 −3 s −1 for both the solid recycled spec- imen and the virgin extruded specimen. This suggests that grain boundary sliding [22][23][24] is the dominant deformation process at 10 −4 -10 −3 s −1 for both the solid recycled specimen and the virgin extruded specimen. Figure 5 shows the side surfaces of the tensile specimens deformed at 3.3×10 −4 s −1 .…”

Section: Superplasticitymentioning

confidence: 94%

Superplasticity and Cavitation of Recycled AZ31 Magnesium Alloy Fabricated by Solid Recycling Process

et al. 2002

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Superplastic behavior and cavitation have been investigated for the solid recycled AZ31 magnesium alloy made of machined chips. The elongation to failure of the solid recycled specimen was lower than that for the extruded specimen from a virgin block (virgin extruded specimen) at elevated temperature, although the strain rate sensitivity for the solid recycled specimen was the same as that for the virgin extruded specimen. The volume fraction of cavities and the total number of cavities for the solid recycled specimen were larger than those for the virgin extruded specimen. Moreover, cavity nucleation occurred not only at grain boundaries, but also in the grains for the solid recycled specimen. It is suggested that contamination of oxide particles at grain boundaries and in grains promotes cavity nucleation in the solid recycled specimen and adversely affects the elongation to failure.

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Section: Superplasticitymentioning

confidence: 94%

Superplasticity and Cavitation of Recycled AZ31 Magnesium Alloy Fabricated by Solid Recycling Process

et al. 2002

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“…The other symbols have their normal meanings. Assumption 13 is that fine-grained spinel deforms by the grain boundary sliding mechanism (superplasticity) with a flow law given by [e.g., Gifkins, 1976Gifkins, , 1978 i;*' = 64V. D…”

mentioning

confidence: 99%

A constitutive model for olivine‐spinel aggregates and its application to deep earthquake nucleation

Liu¹

1997

J. Geophys. Res.

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“…At present, there is no experimental evidence that lends support to this expectation. Gifkins 50 proposed a model for superplasticity whose major feature is the emergence of grains during superplastic deformation. According to the details of the model, grain boundary sliding between four grains is accommodated by the emergence of a central new grain.…”

Section: P Dmentioning

confidence: 99%

The role of boundaries during superplastic deformation

Mohamed

2001

Surface & Interface Analysis

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Micrograin superplasticity refers to the ability of fine-grained materials (d < 10 µm, where d is the grain size) to exhibit extensive neck-free elongations during deformation at elevated temperatures (T > 0.5 T m , where T m is the melting point). Consideration of recent experimental data regarding the effects of impurities on the characteristics of micrograin superplasticity reveals an important role played by boundaries in superplastic alloys. This role pertains to the ability of boundaries to serve as favorable sites for the accumulation of impurities, i.e. boundary segregation. Evidence in support of boundary segregation during micrograin superplasticity is reviewed, with particular emphasis on creep behavior, cavitation, ductility, boundary sliding and the formation of cavity stringers.

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Grain rearrangements during superplastic deformation

Cited by 164 publications

References 16 publications

Superplasticity and Cavitation of Recycled AZ31 Magnesium Alloy Fabricated by Solid Recycling Process

Superplasticity and Cavitation of Recycled AZ31 Magnesium Alloy Fabricated by Solid Recycling Process

A constitutive model for olivine‐spinel aggregates and its application to deep earthquake nucleation

The role of boundaries during superplastic deformation

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