A Review of Superplasticity and Related Phenomena

Underwood, Ervin E.

doi:10.1007/bf03378205

Cited by 33 publications

(22 citation statements)

References 10 publications

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“…(a) The earliest theories, those of Bochvar and Presnyakov (see Underwood [4]) involved solution-precipitation fluctuations or a breakdown of an initially metastable state. As the class of alloys which exhibited superplasticity was enlarged these theories were shown to be inadequate [38].…”

Section: Proposed Mechanismsmentioning

confidence: 99%

“…Several deformation mechanisms have been proposed to account for the details of superplasticity associated with phase transformation: (i) loss of cohesion between atoms in the interface between phases as they move into new positions [4]; (ii) recovery creep enhanced by the abundance of point defects created during volume change which takes place on the transformation austenite to ferrite and vice versa [103]; (iii) the interaction and absorption of dislocation pile-ups in the austenite/ferrite interface [97]; (iv) grain boundary segregation of carbon in ferrite which locally promotes transformation to austenite at the grain boundaries [105,106].…”

Section: Proposed Mechanismsmentioning

confidence: 99%

“…Subsequently, Bochvar, Presnyakov and co-workers (see Underwood [4]) revived interest in the subject and following the work of Backofen et aI [5], a considerable volume of literature describing superplastic alloys has appeared.…”

Section: Introductionmentioning

confidence: 99%

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Superplasticity: A review

et al. 1970

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Section: Proposed Mechanismsmentioning

confidence: 99%

Section: Proposed Mechanismsmentioning

confidence: 99%

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Superplasticity: A review

et al. 1970

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“…Extremly large elongation appears in the superplastic material under optimum conditions of deformation (1). In order to clarify the deformation mechanism in superplasticity and also to obtain the basic knowledge on its application, it is necessary to express the elongation as a function of deformation parameters.…”

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confidence: 99%

Influence of Notch Shape on Elongation in a Sn–Pb Superplastic Alloy

et al. 1986

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The influence of notch shape on the elongation has been investigated for a Sn-38.1 mass%Pb superplastic alloy using specimens with a couple of various V-type notches or a small hole type notch.The elongation of the notched specimen seemed to have a correspondence with the ratio of the cross-sectional area of the specimen, An/As, where An was the minimum area appearing at the bottom of notch and As the original area in the smooth part. However, since the concept based on the ratio itself had no consideration on the significant difference due to the shape of notch, the analysis could not explain the variation in the elongation of specimens with different shapes of notch. Therefore, a simple model of superplastic deformation has been proposed in order to express the difference in notch shape more properly. The model is taking account for distributions of both the strain rate and the m-value pond to the change in cross-sectional area in the gage section including the notch. Using the model, the elongation of the notched specimen has been calculated by the numerical analysis on the basis of the relation between the true stress and the true strain rate for the smooth specimen; a comparison between the experimental and the calculated values of the elongation has been carried out systematically. As a result, it is revealed that the two values are in a fairly good agreement. It is also considered that the flow stress during superplastic deformation is almost directly related to the true strain rate.

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“…However, research interests in superplasticity greatly increased in the 1960s [51,52], when it was demonstrated that in this regime metal sheets could easily be formed to complex shapes. Research efforts are increasingly being directed towards new classes of superplastic materials, some of which exhibit superplastic behavior at considerably higher forming rates [53,54].…”

Section: In Situ Tem Straining and Heating: Superplasticitymentioning

confidence: 99%

Advances in Transmission Electron Microscopy: Self Healing or is Prevention Better than Cure?

Hosson

Yasuda

2007

Springer Series in Materials Science

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In the field of transmission electron microscopy fundamental and practical reasons still remain that hamper a straightforward correlation between microscopic structural information and self healing mechanisms in materials. We argue that one should focus in particular on in situ rather than on postmortem observations of the microstructure. In this contribution this viewpoint has been exemplified with in situ TEM nanoindentation and in situ straining studies at elevated temperatures of metallic systems that are strengthened by either solid solution or antiphase boundaries in intermetallic compounds. It is concluded that recent advances in in situ transmission electron microscopy can provide new insights in the interaction between dislocations and interfaces that are relevant for self healing mechanisms in metallic systems.

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A Review of Superplasticity and Related Phenomena

Cited by 33 publications

References 10 publications

Superplasticity: A review

Superplasticity: A review

Influence of Notch Shape on Elongation in a Sn–Pb Superplastic Alloy

Advances in Transmission Electron Microscopy: Self Healing or is Prevention Better than Cure?

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A Review of Superplasticity and Related Phenomena

Cited by 33 publications

References 10 publications

Superplasticity: A review

Superplasticity: A review

Influence of Notch Shape on Elongation in a Sn&ndash;Pb Superplastic Alloy

Advances in Transmission Electron Microscopy: Self Healing or is Prevention Better than Cure?

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Influence of Notch Shape on Elongation in a Sn–Pb Superplastic Alloy