The effect of grain boundary segregation on superplastic behavior in cation-doped 3Y-TZP

Nakatani, Kazuki; Nagayama, Hitoshi; Yoshida, Hidehiro; Yamamoto, Takahisa; Sakuma, Taketo

doi:10.1016/s1359-6462(03)00408-1

Cited by 38 publications

(17 citation statements)

References 11 publications

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“…A typical example is the high temperature superplastic flow in TZP. [1][2][3][4] Studies showed that the flow stress in the superplastic TZP strongly depends on the type of doping cations, and the co-doping of TiO 2 and GeO 2 is particularly effective for enhancing the superplasticity, namely, reducing the level of flow stress and increasing the tensile ductility. 3 Such a doping effect can be explained by the increase in the grain boundary diffusivity of the Zr 4+ cation, because a couple of grain boundary sliding and grain switching accommodated by the grain boundary diffusion of the Zr 4+ cation can be regarded as the main mechanism of the superplastic flow in TZP.…”

Section: Introductionmentioning

confidence: 99%

Ionic conductivity of tetragonal ZrO2 polycrystal doped with TiO2 and GeO2

Yoshida

Morita

Kim

et al. 2009

Journal of the European Ceramic Society

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Section: Introductionmentioning

confidence: 99%

Ionic conductivity of tetragonal ZrO2 polycrystal doped with TiO2 and GeO2

Yoshida

Morita

Kim

et al. 2009

Journal of the European Ceramic Society

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“…25) It has been previously reported that the flow stress of high-temperature deformation caused by grain boundary sliding changes due to grain boundary segregation. 26) The activation energy of the grain boundary sliding of Ni is 156 kJ/mol, and that of NiB calculated from eq. ( 1) increases by 10 kJ/mol using the test results obtained at 1 © 10 ¹4 s ¹1 and 450°C.…”

Section: Discussionmentioning

confidence: 99%

Effect of Boron and Tungsten Addition on Superplasticity and Grain Growth in Electrodeposited Nickel Alloys

2022

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The effect of W and B addition on the superplastic deformation and grain growth of electrodeposited nanocrystalline Ni alloys with a crystal grain size of approximately 20 nm was investigated with the aim of improving the mechanical properties by maintaining fine grain sizes during superplastic deformation. A maximum elongation of 12% was recorded for electrodeposited Ni1.8 at% W at a temperature of 350°C and a strain rate of 1.0 © 10 ¹4 s ¹1 . The electrodeposited NiW failed to exhibit superplasticity because the segregated W at the grain boundaries increased the energy required for grain boundary sliding. In contrast, the electrodeposited Ni0.06 at% B exhibited superplasticity with a recorded elongation of 362% at a temperature of 450°C and a strain rate of 1.0 © 10 ¹4 s ¹1 . With the addition of B, the optimal superplastic strain rates of the electrodeposited NiB shifted to lower values than that of the electrodeposited Ni. The grain size and hardness of the electrodeposited NiB after superplastic deformation were smaller and higher, respectively, than those of the electrodeposited Ni. The addition of B successfully suppressed grain growth and improved the mechanical properties after superplastic deformation.

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“…For example, addition of some oxides (as Al 2 O 3 , SiO 2 , GeO 2 , TiO 2 , MgO) to 3Y-TZP significantly enhances the superplastic flow in this material. 9,10 Superplastic flow in 3Y-TZP is attributed to the grain boundary sliding controlled by the grain boundary diffusion of Zr 4+ ions. 5 The dopant cations added to 3Y-TZP, tend to segregate to the grain boundaries, thus they could affect grain boundary diffusion of Zr 4+ and hence they could change the superplastic flow of the ceramics.…”

Section: Introductionmentioning

confidence: 99%