The high temperature mechanical characteristics of superplastic 3 mol% yttria stabilized zirconia

Owen, David M.; Chokshi, Atul H.

doi:10.1016/s1359-6454(97)00251-6

Cited by 137 publications

(95 citation statements)

References 41 publications

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“…For instance, according to the analysis by Domínguez-Rodríguez's group, the superplastic flow is rate-controlled by grain boundary sliding accommodated by lattice diffusion; 17,35) the increased stress exponent in the intermediate flow stresses results from threshold stress of the grain boundary sliding, and Nabarro-Herring diffusional creep occurs at very low stresses. On the other hand, other interpretations, such as the interface reaction-controlled diffusional process 36,37) and dislocation activity-involved grain boundary sliding process, 38,39) have been proposed by other research groups. The discrepancy in the interpretations is probably attributed to the fact that different physical models for superplastic deformation often predict the same deformation parameters.…”

Section: Phenomenological Analysis Of Superplasticitymentioning

confidence: 99%

High Temperature Grain Boundary Plasticity in Ceramics

Sakuma

Yoshida

2009

Mater. Trans.

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Superplasticity in fine-grained materials has been generally analyzed on the basis of their experimental strain rate-flow stress relationship. The phenomenological analysis based on a constitutive equation is effective for understanding the overall flow and fracture behavior and to speculate on the rate-controlling mechanism of superplastic flow. However, it has been recently pointed out that the high temperature superplastic flow and failure in ceramics is significantly influenced by the atomic structure and chemistry of grain boundary. Such phenomenon cannot be explained based on the classical phenomenological analysis. Our research group has therefore proposed to establish a new research field, grain boundary plasticity, to describe the superplastic deformation related to the grain boundary quantum structure. This paper aims to point out the importance of the quantum structure analysis of the grain boundary to understand the high temperature plasticity in ceramics.

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Section: Phenomenological Analysis Of Superplasticitymentioning

confidence: 99%

High Temperature Grain Boundary Plasticity in Ceramics

Sakuma

Yoshida

2009

Mater. Trans.

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“…Therefore, the characteristic martensitic transformation temperatures [16] are expected to determine the operating temperature window of shape memory ceramics [12], and lay the foundation for tailoring their high temperature shape memory properties [17]. More importantly, our earlier work suggested that the stress-induced transformation in small volume zirconia could exhibit a systematic monoclinic variant preference in terms of transformation crystallography [18].…”

Section: Introductionmentioning

confidence: 99%

In-situ studies on martensitic transformation and high-temperature shape memory in small volume zirconia

Zeng

Tamura

et al. 2017

Acta Materialia

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Shape memory effect (SME) High temperature deformation High temperature shape memory ceramics a b s t r a c t Recently, the shape memory effect with significant recoverable shape deformation has been discovered in small volume single-crystal zirconia. The application potential for such shape memory ceramics has spurred in-depth exploration of the martensitic transformation crystallography and high temperature shape memory effect. In this work, the martensitic transformation of micron-sized zirconia has been studied in both a pristine as-produced condition and after micromechanical compression, using synchrotron scanning micro X-ray diffraction (mXRD). The pristine zirconia was found to transform into the monoclinic phase via a different crystallographic path than the compressed zirconia, resulting in distinct monoclinic variant preferences. The characteristic martensitic transformation temperatures were also found to be higher after uniaxial compression than in the pristine condition. Such observations provide insight on the differences between stress-induced and thermally-induced martensitic transformation. Moreover, we have observed a full cycle of the shape memory effect with large recoverable strain (7%) in micron-sized zirconia at a temperature of 400 C. Our findings provide an important guideline to tailor the high-temperature shape memory properties of zirconia for further scientific research and engineering applications.

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“…11,[18][19][20] It is therefore reasonable to explain that the high-strain-rate superplastic flow of the ZrO 2 -spinel composite also occurs primarily through GBS.…”

Section: Discussionmentioning

confidence: 99%

Effect of MgAl2O4 Spinel Dispersion on High-Strain-Rate Superplasticity in Tetragonal ZrO2 Polycrystal

et al. 2004

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The effect of second phase dispersion on high-strain-rate superplasticity was examined in tetragonal ZrO 2 dispersed with 30 vol% MgAl 2 O 4 spinel. The spinel particle enhances the diffusivity of ZrO 2 by supplying small amounts of aluminum and magnesium into ZrO 2 and suppresses grain growth by grain boundary pinning. After superplastic flow, the spinel particles highly elongate along the tensile direction. In the spinel particles, intragranular dislocations were observed, indicating that the spinel particles may contribute to the relaxation of stress concentrations around grain junctions exerted by grain boundary sliding. Comparison with earlier studies suggests that the dispersion of spinel particles can attain high-strain-rate superplasticity in tetragonal ZrO 2 through providing the following positive factors simultaneously; (i) the suppressed grain growth, enhanced accommodation process due to the accelerated (ii) diffusivity and (iii) stress relaxation.

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The high temperature mechanical characteristics of superplastic 3 mol% yttria stabilized zirconia

Cited by 137 publications

References 41 publications

High Temperature Grain Boundary Plasticity in Ceramics

High Temperature Grain Boundary Plasticity in Ceramics

In-situ studies on martensitic transformation and high-temperature shape memory in small volume zirconia

Effect of MgAl<SUB>2</SUB>O<SUB>4</SUB> Spinel Dispersion on High-Strain-Rate Superplasticity in Tetragonal ZrO<SUB>2</SUB> Polycrystal

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