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Wang, Z. C.; Ridley, N.; Davies, Thomas

doi:10.1023/a:1004677421922

Cited by 18 publications

(24 citation statements)

References 14 publications

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“…However, the value of strain rate sensitivity index is less than 1 in this material and hence the deviation from the ratio of 1 could be noted. As reported in the literature for other materials [15,18], in the initial stages of deformation the strain remains uniform through out the gauge. However, the strain localization is reported to take place somewhere in the middle portion of the gauge length on subjecting to large strains.…”

Section: Strain Localizationsupporting

confidence: 72%

“…Some qualitative observations of cavity morphology were reported along the gauge of the tensile sample in Zn Á/22% Al alloy [17]. Recently Wang et al [18] did a quantitative analysis on the effect of local strain on the cavitation behavior of 3Y-TZP. No such study was made in the superplastic Al Á/Li 8090 alloy, which has layered microstructure [8].…”

Section: Introductionmentioning

confidence: 99%

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Effect of local strain distribution on concurrent microstructural evolution during superplastic deformation of Al–Li 8090 alloy

Pancholi¹,

Kashyap²

2003

Materials Science and Engineering: A

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Superplastic deformation of Al Á/Li 8090 alloy was carried out to study the effect of local strain developed on the microstructural variation along the gauge length of tensile specimens. For this, separate specimens were deformed to failure at a constant temperature of 530 8C and at the strain rates within the superplastic regime. The strain distribution was found to be non-uniform with more deformation towards fracture tip and less towards the shoulder section of specimens. The grain size was found to decrease with increase in local strain whereas cavity size and cavity volume fraction were found to increase. The cavity growth in longitudinal direction is suggested to be controlled by power law but the same in transverse direction is controlled by diffusional process. A model is proposed for cavity nucleation on the basis of inhomogeneity in microstructure and its implication in deformation mechanism.

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Section: Strain Localizationsupporting

confidence: 72%

Section: Introductionmentioning

confidence: 99%

Effect of local strain distribution on concurrent microstructural evolution during superplastic deformation of Al–Li 8090 alloy

Pancholi¹,

Kashyap²

2003

Materials Science and Engineering: A

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“…This value is quite small in comparison with the gap, approximately 3 nm, of crack-like cavities observed by TEM. 23) However, the actual average gap thickness of the flat cavities may be larger than 0.48 nm, perhaps, in the order same with that observed by Wang et al, since the flat cavities are not forming a line along the tensile direction. After all, such cavities with thickness of roughly 3 nm or less are too small to identify by SEM.…”

Section: Wan Y Motohashi and S Harjosupporting

confidence: 60%

Effect of Superplastic Deformation on Thermal Expansion Behavior of Tetragonal Zirconia Polycrystals

2003

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Three mol% yttria stabilized tetragonal zirconia polycrystals (3Y-TZP) were superplastically deformed under various conditions and microstructural evolution was characterized. Thermal expansion properties of the 3Y-TZP specimens were then measured by a push-rod type dilatometer in a temperature range from 300 K to 1473 K. Experimental results showed that the mean coefficient of linear thermal expansion, , decreased with an increase in the volume fraction of cavities. The cavity dependence of value was dependent on temperature and was weakened with an increase in temperature. Changes in the average grain size and grain aspect ratio due to the superplastic deformations were found to have little effect on the thermal expansion property within the present experimental range.

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“…Experimental studies have shown that superplastic deformation is inherently accompanied by accelerated grain growth (dynamic grain growth) [12,[16][17][18] and intergranular cavitation [12,[16][17][18][19][20][21][22][23][24][25][26][27] the latter. Since cavitation damage leads to premature failure [12,[16][17][18][19][24][25][26][27] or degrades the postdeformation strength [28], consideration of these dynamic phenomena is indispensable for attaining HSRS and for industrial applications.…”

Section: Creep Equationmentioning

confidence: 99%

“…Accordingly, the void growth cannot be easily controlled by modifications in the chemical composition and microstructure. The growing voids interlink with each other, resulting in cracking perpendicular to the stress axis [16][17][18][19][24][25][26][27]. A strong resemblance has been found between this process and that of ductile failure in metallic materials containing microvoids or hard inclusions [27].…”

Section: Cavity Growth and Crackingmentioning

confidence: 99%

High-strain-rate superplasticity in oxide ceramics

Hiraga

Kim

Morita

et al. 2007

Science and Technology of Advanced Materials

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Factors limiting the strain rate of superplastic deformation in ceramic materials are discussed on the basis of existing models and experimental results concerning high-temperature plastic deformation, intergranular cavitation and dynamic grain growth. From the discussion, it is indicated that simultaneously fulfilling the following conditions is essential for attaining high-strain-rate superplasticity (HSRS) in ceramic materials: reduction in the initial grain size, enhanced diffusivity, suppressed dynamic grain growth, a homogeneous microstructure and a reduced number of residual defects. In the light of these conditions, explanations are given for HSRS attained in earlier studies on some oxide materials. It is also shown that HSRS can be intentionally attained in doped yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) and composites synthesized from ZrO 2 , Al 2 O 3 and MgO 2 ; the tensile ductility of these composites reached 300-2500% at a strain rate of 0.01-1.0 s À1. The postdeformation microstructure indicates that some secondary phases may suppress cavitation damage and thereby enhance HSRS. r

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Untitled

Cited by 18 publications

References 14 publications

Effect of local strain distribution on concurrent microstructural evolution during superplastic deformation of Al–Li 8090 alloy

Effect of local strain distribution on concurrent microstructural evolution during superplastic deformation of Al–Li 8090 alloy

Effect of Superplastic Deformation on Thermal Expansion Behavior of Tetragonal Zirconia Polycrystals

High-strain-rate superplasticity in oxide ceramics

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