Anisotropy of the mechanical properties and features of the tetragonal to monoclinic transition in partially stabilized zirconia crystals

Borik, M.A.; Borichevskij, V.P.; Бублик, В. Т.; Kulebyakin, A. V.; Ломонова, Е. Е.; Milovich, F. O.; Мызина, В. А.; Ryabochkina, P. A.; Sidorova, N. V.; Tabachkova, N. Yu.

doi:10.1016/j.jallcom.2019.04.105

Cited by 15 publications

(4 citation statements)

References 17 publications

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“…Unlike ceramics, crystals exhibit anisotropic mechanical properties [17,40], which should be taken into account if the material is practically applied. With regard to earlier results [23] on the mechanical properties of ZrO 2 -Gd 2 O 3 solid solutions in regard to the different crystallographic faces of the crystals, we studied the effect of annealing on the microhardness and fracture toughness of specimens cut from crystals perpendicular to the <100> direction in regard to different indenter diagonal orientations in the specimen plane.…”

Section: Resultsmentioning

confidence: 99%

Effect of heat treatment on the structure and mechanical properties of partially gadolinia-stabilized zirconia crystals

Borik

Chislov

Kulebyakin

et al. 2021

Journal of Asian Ceramic Societies

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ZrO 2 ) 1-x (Gd 2 O 3 ) x (x= 0.028-0.04) is heat-treated at 1600°C in air or in vacuum. Partially gadolinia-stabilized zirconia crystals are grown by the skull melting technique. The effect of annealing on the phase compositions, structures, and mechanical properties of the crystals is studied using X-ray diffraction, Raman spectroscopy, transmission electron microscopy, and indentation. A comparison with previously obtained data on the structure and properties of crystals after growth shows that annealing the crystals leads to the redistribution of gadolinia between the tetragonal phases: the t phase is depleted of gadolinia while the t' phase becomes enriched. The gadolinia-enriched t' phase undergoes multistage twinning. Thus, the sizes of the twins in the t' phase are far smaller than those in the t phase. Annealing the crystals increases their fracture toughness, and this increase is larger for all crystals after air annealing. The increase in the fracture toughness of the crystals is caused by a decrease in the gadolinia concentration in the transformable t phase, which enhances the effect of the transformation hardening mechanism. The fracture toughness of the crystals is further increased by the ferroelastic hardening mechanism, the effect of which is enhanced with an increase in the quantity of the t' phase in the crystals.

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Section: Resultsmentioning

confidence: 99%

Effect of heat treatment on the structure and mechanical properties of partially gadolinia-stabilized zirconia crystals

Borik

Chislov

Kulebyakin

et al. 2021

Journal of Asian Ceramic Societies

Self Cite

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“…It should be noted that there is a scatter in the values of microhardness on the friction surface, due to both the scatter of the hardness on the initial surface and the inhomogeneity of the microstructure of the surface films. The decrease in microhardness during tribological tests of samples containing up to 3.5 mol.% Y2O3 is obviously associated with the appearance on the sample surface of a monoclinic phase formed during the phase transition of the transformed tetragonal phase under the action of mechanical loads and a local increase in temperature during friction [9]. Due to the mechanism of transformation hardening [13], the number of microcracks on the surface is small and they are of a surface nature, but the microhardness decreases.…”

Section: Resultsmentioning

confidence: 99%

“…Among zirconium materials, partially stabilized zirconia (PSZ) crystals stand out for their unique combination of strength and tribological properties [9]. During friction, due to the discreteness of the contact of solid bodies, large temperature jumps appear on the areas of actual contact [10].…”

Section: Introductionmentioning

confidence: 99%

Analysis of surface structure of zirconia crystals in case of friction against steel

et al. 2020

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The article considers the formation of the third body during dry friction of the nanostructured zirconia crystals partially stabilized with yttria against steel. The assumption is substantiated that the tribological properties of the studied friction pair are determined by the properties of the films formed on the surface of the crystals. Friction tests under sliding conditions were performed according to the “disk-finger” scheme. The results of electron microscopic examination of the friction surfaces of crystals are presented. The elemental composition was determined, and the phase composition of the transfer films of various sections of the crystal friction surface was calculated. At high magnifications, it was found that the friction surface of samples with 2-4 mol.% of Y2O3 has the sufficiently homogeneous structure of the films with traces of boundaries of smaller particles of the transferred material. Destruction of the friction surface of a sample with a Y2O3 content of 8 mol.% occurs at a deeper level and affects not only the layer of secondary structures, but also the underlying layers of the base material.

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“…The differences in the mechanical properties of anisotropic materials are generally manifested by the elastic modulus, Poisson’s ratio, and strength, in different directions [ 10 , 11 , 12 ]. Therefore, classical elastoplastic mechanics based on homogeneous, continuous, and isotropic assumptions cannot correctly reflect anisotropic mechanical behavior.…”

Section: Introductionmentioning

confidence: 99%

Spatial Constitutive Modeling of AA7050-T7451 with Anisotropic Stress Transformation

Wang

et al. 2022

Materials

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The mechanical properties of anisotropic materials are generally characterized based on the orthotropy or transverse isotropy. However, the two-dimensional plane stress problems cannot comprehensively characterize the anisotropy of materials. In this study, based on the theory of elasticity and the transformation of the three-dimensional space coordinate system, combined with the projection relationship of the Cauchy stress tensor of an arbitrary section, the transformation relationship of the elastic modulus, shear modulus, and stress–strain between the orthogonal and load coordinate systems are obtained. The orthotropic Johnson-Cook (JC) constitutive model of AA7050-T7451 aluminum alloy is modified by fitting, and the constitutive relationship at any spatial angle is theoretically calculated by combining the obtained spatial coordinate transformation matrix. The generated spatial constitutive model is verified and modified through experiments. The results demonstrate that the theoretical mechanical properties and the modified spatial constitutive model can accurately reflect the effect of the spatial angle on the material stress distribution.

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Anisotropy of the mechanical properties and features of the tetragonal to monoclinic transition in partially stabilized zirconia crystals

Cited by 15 publications

References 17 publications

Effect of heat treatment on the structure and mechanical properties of partially gadolinia-stabilized zirconia crystals

Effect of heat treatment on the structure and mechanical properties of partially gadolinia-stabilized zirconia crystals

Analysis of surface structure of zirconia crystals in case of friction against steel

Spatial Constitutive Modeling of AA7050-T7451 with Anisotropic Stress Transformation

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