On micro-superplasticity

Zelin, M. G.

doi:10.1016/s1359-6454(97)00065-7

Cited by 46 publications

(39 citation statements)

References 14 publications

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“…[42] A variety of explanations have been proposed for the origins of these submicrometer fibers. [42] Figures 10 and 11, however, provide clear evidence from which at least two important conclusions can be drawn. First, fiber formation is distinctly associated with deformation by GBS creep.…”

mentioning

confidence: 99%

Failure mechanisms in superplastic AA5083 materials

Kulas

Green

Taleff

et al. 2006

Metall Mater Trans A

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mentioning

confidence: 99%

Failure mechanisms in superplastic AA5083 materials

Kulas

Green

Taleff

et al. 2006

Metall Mater Trans A

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“…To study the deformation structure under these conditions, we performed SEM observation of the deformation structure after 40% deformation ( Figure 12). Since we observed the projections of grain boundaries, the formation of the fiber structure on the grain boundaries, as well as minute cavities among the fiber structures, we assumed that GBS with concurrent formation of minute cavities was the main deformation mechanism [38,39]. Figure 12(b) shows the observed deformation structure; crease-like patterns (indicated by arrows) were observed within the grains and transgranular sliding also occurred.…”

Section: Evaluation Of the Stability Of High-temperature Deformationmentioning

confidence: 93%

“…At 40% deformation, GBS was clearly dominant, and the surface of the tensile specimen was uneven. When the degree of deformation was 80% and higher, cavities were clearly observed and GBS occurred; further, a fiber-like structure [38,39] was formed on the grain boundary, along with the growth of cavities. However, grains were not elongated in the tensile direction.…”

Section: Observation Of Plate Surface Structure After High-temperaturementioning

confidence: 99%

Transition in Deformation Mechanism of AZ31 Magnesium Alloy during High-Temperature Tensile Deformation

Noda

Mori

Funami

2011

Journal of Metallurgy

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Magnesium alloys can be used for reducing the weight of various structural products, because of their high specific strength. They have attracted considerable attention as materials with a reduced environmental load, since they help to save both resources and energy. In order to use Mg alloys for manufacturing vehicles, it is important to investigate the deformation mechanism and transition point for optimizing the material and vehicle design. In this study, we investigated the transition of the deformation mechanism during the high-temperature uniaxial tensile deformation of the AZ31 Mg alloy. At a test temperature of 523 K and an initial strain rate of 3 × 10 −3 s −1 , the AZ31 Mg alloy (mean grain size: ∼5 μm) exhibited stable deformation behavior and the deformation mechanism changed to one dominated by grain boundary sliding.

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“…The original surface deformed at 673 K is characterized by granular feature corresponding with a grain size of 7.9 µm. At the higher temperature of 793 K rows of fibers 14) appear between grains that have original surface before tensile testing. Formation of the rows of fibers was understood as cooperative grain boundary sliding.…”

Section: Temperature Dependencementioning

confidence: 99%

“…Formation of the rows of fibers was understood as cooperative grain boundary sliding. 14,15) The difference in the surface feature between at the two temperatures suggests that difference in contribution of grain boundary sliding (GBS) to elongation. The contribution of GBS can not be estimated obviously from these surface features although the GBS is expected to be a dominant mechanism at the higher temperature from the higher m value.…”

Section: Temperature Dependencementioning

confidence: 99%

Deformation and Fracture at High Temperatures in an Al-Mg-Mn Alloy Sheet Consisting of Coarse- and Fine-Grained Layers

et al. 2002

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High temperature deformation and fracture of the Al-Mg-Mn sheet consisting with the coarse-grained surface and the fine-grained center layers have been investigated. Such a microstructure was produced by the continuous cyclic bending (CCB) and the subsequent annealing. The elongation to failure has a peak value at 713 K at initial strain rates of 5.6 × 10 −4 s −1 and 5.6 × 10 −3 s −1 in both of as-received sample (0P) with fine grains and CCBent and annealed one (20P A) with the coarse and the fine grains in spite of different microstructures. The m value decreases for 20P A and increases for 0P with increasing temperature. However, the increase of the m value is not correspondent to the change in the elongation. Deformation mechanism is discussed with activation energy. The SEM micrographs of original surfaces of tensile specimen deformed to failure reveal that at the relatively high temperatures many cracks are formed inside the coarse grains. The features of fractured surface for the 20P A sample reflect the coarse-and the fine-grained layers faithfully.

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On micro-superplasticity

Cited by 46 publications

References 14 publications

Failure mechanisms in superplastic AA5083 materials

Failure mechanisms in superplastic AA5083 materials

Transition in Deformation Mechanism of AZ31 Magnesium Alloy during High-Temperature Tensile Deformation

Deformation and Fracture at High Temperatures in an Al-Mg-Mn Alloy Sheet Consisting of Coarse- and Fine-Grained Layers

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