Dynamic Grain Growth During Superplastic Deformation of Yttria-Stabilized Tetragonal Zirconia Polycrystals

1989 ◽  
Vol 72 (8) ◽  
pp. 1469-1472 ◽  
Author(s):  
Tai-Gang Nieh ◽  
Jeffrey Wadsworth
Keyword(s):  
Grain Growth ◽  
Superplastic Deformation ◽  
Tetragonal Zirconia ◽  
Dynamic Grain Growth

Dynamic grain growth during superplastic deformation

1996 ◽  
Vol 44 (5) ◽  
pp. 2073-2078 ◽  
Author(s):  
M.Kh. Rabinovich ◽  
V.G. Trifonov
Keyword(s):  
Grain Growth ◽  
Superplastic Deformation ◽  
Dynamic Grain Growth

Superplastic Extrusion of Al2O3-YTZ Nanocomposite and Its Deformation Mechanism

2005 ◽  
Vol 475-479 ◽  
pp. 2973-2976 ◽  
Author(s):  
Guo Qing Chen ◽  
Kai Feng Zhang
Keyword(s):  
Elevated Temperature ◽  
Grain Growth ◽  
Deformation Mechanism ◽  
Tetragonal Zirconia ◽  
Extrusion Pressure ◽  
Second Phase ◽  
Temperature Range ◽  
Punch Speed ◽  
Dynamic Grain Growth

Using Al2O3-YTZ(3mol% yttria stabilized tetragonal zirconia) nanocomposite, superplastic extrusion under different conditions was adopted to form blade models. The results demonstrate that desired microstructure is achieved through the addition of 20mol% YTZ which acts as a second-phase pinning agent. At temperature range of 1650°C to 1700°C the material shows good deformability. At this elevated temperature the maximum extrusion pressure is lower than 25MPa, and the maximum punch speed is about 0.35mm·min-1. In superplastic extrusion the dominating deformation mechanism is grain sliding and rotation, the accommodating mechanism is intergranular zirconia coordinated deformation. Meanwhile static and dynamic grain growth also plays an important role in deformation.

Dynamic Grain Growth in Superplastic Y-TZP and Al2O3/YTZ

1990 ◽  
Vol 196 ◽  
Author(s):  
T. G. Nieh ◽  
C. M. Tomasello ◽  
J. Wadsworth
Keyword(s):  
Growth Rate ◽  
Grain Size ◽  
Grain Growth ◽  
Kinetic Constant ◽  
Boundary Energy ◽  
Tetragonal Zirconia ◽  
Grain Boundary Energy ◽  
Fine Grained ◽  
Dynamic Grain Growth ◽  
Similar Equation

ABSTRACTBoth static and dynamic grain growth have been studied during superplastic deformation of fine-grained yttria-stabilized tetragonal zirconia (Y-TZP) and alumina reinforced yttria-stabilized tetragonal zirconia (Al2O3/YTZ). Grain growth was observed in both materials at temperatures above 1350° C. In the case of Y-TZP, both static and dynamic grain growth were found to obey a similar equation of the form: where D is the instantaneous grain size, Do is the initial grain size, t is the time, and k is a kinetic constant which depends primarily on temperature and grain boundary energy. The activation energies for Y-TZP were approximately 580 and 520 kJ/mol, for static and dynamic grain growth, respectively. In the case of Al2O3/YTZ, it was found that the grain growth rate for the Al2O3 phase was slower than that for the ZrO2 phase. The growth rate of the ZrO2 phase in Al2O3/YTZ is, however, similar to that in monolithic ZrO2, i.e., Y-TZP.

A grain-boundary diffusion model of dynamic grain growth during superplastic deformation

1999 ◽  
Vol 47 (12) ◽  
pp. 3433-3439 ◽  
Author(s):  
Byung-Nam Kim ◽  
Keijiro Hiraga ◽  
Yoshio Sakka ◽  
Byung-Wook Ahn
Keyword(s):  
Grain Boundary ◽  
Grain Growth ◽  
Diffusion Model ◽  
Superplastic Deformation ◽  
Boundary Diffusion ◽  
Grain Boundary Diffusion ◽  
Dynamic Grain Growth

The Effect of Grain Size on Superplastic Deformation of Ti-6Al-4V Alloy

2007 ◽  
Vol 551-552 ◽  
pp. 387-392 ◽  
Author(s):  
Wen Juan Zhao ◽  
Hua Ding ◽  
D. Song ◽  
F.R. Cao ◽  
Hong Liang Hou
Keyword(s):  
Grain Size ◽  
Grain Growth ◽  
Superplastic Deformation ◽  
Initial Strain Rate ◽  
Deformation Mode ◽  
Tensile Tests ◽  
Optical Microscope ◽  
Coarse Grained ◽  
Transmission Electron ◽  
Grain Growth Model

In this study, superplastic tensile tests were carried out for Ti-6Al-4V alloy using different initial grain sizes (2.6 μm, 6.5μm and 16.2 μm) at a temperature of 920°C with an initial strain rate of 1×10-3 s-1. To get an insight into the effect of grain size on the superplastic deformation mechanisms, the microstructures of deformed alloy were investigated by using an optical microscope and transmission electron microscope (TEM). The results indicate that there is dramatic difference in the superplastic deformation mode of fine and coarse grained Ti-6Al-4V alloy. Meanwhile, grain growth induced by superplastic deformation has also been clearly observed during deformation process, and the grain growth model including the static and strain induced part during superplastic deformation was utilized to analyze the data of Ti-6Al-4V alloy.

Dynamic grain growth in Al–6Ni: Modelling and experiments

2005 ◽  
Vol 53 (16) ◽  
pp. 4313-4321 ◽  
Author(s):  
K HYDE ◽  
P BATE
Keyword(s):  
Grain Growth ◽  
Dynamic Grain Growth

scholarly journals Grain Growth Induced by Superplastic Deformation in Zn-22%Al Alloy

1988 ◽  
Vol 52 (11) ◽  
pp. 1043-1050 ◽  
Author(s):  
Eiichi Sato ◽  
Kazuhiko Kuribayashi ◽  
Ryo Horiuchi
Keyword(s):  
Grain Growth ◽  
Superplastic Deformation ◽  
Al Alloy
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