Polymorphic transformation of ZrO2 in the 75 wt % Al2O3 + 25 wt % ZrO2 alloy solidified under nonequilibrium conditions

Gladkov, V.E.; Berezin, V. M.; Zhekhanova, N.B.

doi:10.1134/s0020168510070125

Cited by 3 publications

(1 citation statement)

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“…Obviously, GdZrO grows on the expense of Zr and O from the 3YSZ substrate. The loss of oxygen resulting in the formation of a nonstoichiometric ZrO 2-x [19] could explain gray coloring of the substrates, noted during the high-temperature tests. The melting temperature for the Gd-rich phase in the Gd 40 Ti 60 and Gd 60 Ti 40 alloys (1220-1250°C) determined upon heating in the present sessile drop studies on all substrates shows a good agreement with the eutectic isotherm (T E = 1240°C) from the Gd-Ti phase diagram [1].…”

Section: Discussionmentioning

confidence: 96%

Sessile drop study of Gd–Ti monotectic alloys on ceramic substrates: phase transformations, wetting, and reactivity

Kaban

Nowak²,

Korpała³

et al. 2012

J Mater Sci

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Gd-Ti monotectic alloys were studied in a wide temperature range by the sessile drop technique. The eutectic and monotectic transformations in Gd-Ti alloys upon heating were in situ monitored by a high-speed and high-resolution CCD camera. Our findings suggest that the existing Gd-Ti phase diagram significantly underestimates the monotectic and binodal temperatures in this system. The wetting behavior and the high-temperature interaction of the Gd-Ti melts with yttria and yttria-stabilized zirconia substrates were investigated.

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Section: Discussionmentioning

confidence: 96%

Sessile drop study of Gd–Ti monotectic alloys on ceramic substrates: phase transformations, wetting, and reactivity

Kaban

Nowak²,

Korpała³

et al. 2012

J Mater Sci

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Study of Polymorphic Transformation Processes and Their Influence in Polycrystalline ZrO2 Ceramics upon Irradiation with Heavy Ions

2023

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The aim of this work was to study the mechanisms of polymorphic transformations in ZrO2 ceramics under irradiation with heavy ions, as well as to determine the nature of structural distortions in the case of t-ZrO2 → c-ZrO2 type transformations and associated anisotropic deformations. The samples of ZrO2 ceramics were irradiated with Kr15+ heavy ions with an energy of 150 MeV and fluences of 1011–1016 ion/cm2. During evaluation of the structural changes depending on the irradiation fluence, it was found that at low irradiation fluences (1011–1012 ion/cm2), the main role is played by deformation distortions of the crystal lattice, which have a pronounced anisotropic character. Meanwhile, at fluences above 1013 ion/cm2, the main role is played by polymorphic transformations of the t-ZrO2 → c-ZrO2 type, followed by amorphization of the damaged layer at fluences above 1015 ion/cm2. It was established that the anisotropic distortion of the crystal lattice is more pronounced along the crystallographic a axis, as well as the (011) texture orientation, which is characteristic of t-ZrO2. The polymorphic transformation processes of the t-ZrO2 → c-ZrO2 type occur at irradiation fluences of 1013–1014 ions/cm2, which are characterized by the formation of an overlap of local areas of defects that appear along the trajectory of ions in the material. The dependences of changes in the strength and thermophysical properties of ZrO2 ceramics on the irradiation fluence were obtained. The mechanisms of influence of the structural disorder and polymorphic transformations on the decrease in strength and crack resistance were established.

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Investigation of Physical and Chemical Processes of Formation of Composite Materials with Specified Structural Phase Characteristics

Михайлов

Morozova

Бамбуров

2019

MSF

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In domestic practice development of the production technology of rail grinding wheels has outstripped the development of technology for the production of zirconium electro-corundum; the electrocorundum meets the requirements of non-thermal metal treatment. Among the artificial abrasives the leading place belongs to corundum and corundum based alloys (zirconium electrocorundum). At the moment the domestic factories of the abrasive industry are producing zirconium electrocorundum of the pre-eutectic composition (containing about 25% of zirconium dioxide) for rough grinding applied for the rough processing of the rolled products. The zirconium electrocorundum for the final non-thermal metal treatment is not produced by domestic factories; there are no technical requirements for such a material. This work was targeted to develop compositions and parameters for melting of prototypes for the industrial scale production of zirconium electrocorundum with specified and controlled properties. The grain of zirconium electrocorundum in the grinding wheels used in rail grinding trains has specific properties. According to the principles of non-thermal material processing, the structural and phase state of the grinding grain should provide high strength and durability under normal conditions, and at the same time it should tend to shear during the thermal exposure. The design of domestic electrocorundum for rail grinding with properties which are not inferior in comparison with the imported analogues is a strategic issue.

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Polymorphic transformation of ZrO2 in the 75 wt % Al2O3 + 25 wt % ZrO2 alloy solidified under nonequilibrium conditions

Cited by 3 publications

References 1 publication

Sessile drop study of Gd–Ti monotectic alloys on ceramic substrates: phase transformations, wetting, and reactivity

Sessile drop study of Gd–Ti monotectic alloys on ceramic substrates: phase transformations, wetting, and reactivity

Study of Polymorphic Transformation Processes and Their Influence in Polycrystalline ZrO2 Ceramics upon Irradiation with Heavy Ions

Investigation of Physical and Chemical Processes of Formation of Composite Materials with Specified Structural Phase Characteristics

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