Journal ArticleDOI
Improvement of tensile ductility in high-purity alumina due to magnesia addition
Y. Yoshizawa,T. Sakuma +1 more
TLDR
In this article, the role of grain size on tensile ductility is discussed in high-temperature plastic flow of high-purity A1 2 O 3 and MgO-doped A 1 2 O3 in a temperature range 1300 ∼ 1450°C.Abstract:
High-temperature plastic flow of high-purity A1 2 O 3 and MgO-doped A1 2 O 3 has been examined in a temperature range 1300 ∼ 1450°C. High-purity A1 2 O 3 with an initial grain size of about 0.9 μm is characterized by large strain-hardening rate and small tensile ductility up to 20%. The addition of 0.1 wt% MgO into A1 2 O 3 results in a decrease of strain-hardening rate and improves tensile ductility. The tensile elongation up to 70% is obtained in MgO-doped A1 2 O 3 . The difference in plastic flow behavior between pure and MgO-doped A1 2 O 3 is caused by the difference in grain growth during high-temperature deformation between the two materials. The grain growth inhibition caused by the MgO addition is very important to improve the tensile ductility. The tensile ductility of MgO-doped A1 2 O 3 is slightly but further improved in a temperature-increasing test. The role of grain size on tensile ductility is discussed in this paper.read more
Citations
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Journal ArticleDOI
Grain Boundary Migration in Ceramics
J.D. Powers,Andreas M. Glaeser +1 more
TL;DR: In this paper, the authors examined grain boundary migration in ceramics and discussed the effects of solutes, pores, and liquid phases on grain boundary migrations, and their role in the development of anisotropic (anisometric) microstructures.
Journal ArticleDOI
Superplasticity in fine grained ceramics and ceramic composites: current understanding and future prospects
TL;DR: In this paper, the authors provide an overview of superplastic deformation and failure in ceramics, with specific emphasis on a 3 mol.% yttria stabilized zirconia and a 20wt.% alumina composite.
Journal ArticleDOI
The enhancement of superplastic flow in tetragonal zirconia polycrystals with SiO2-doping
TL;DR: In this paper, the authors investigated the superplasticity of SiO{sub 2}-doped tetragonal zirconia polycrystal (2.5Y-TZP) by means of tensile testing in a temperature range 1,200--1,500 C.
Journal ArticleDOI
Fabrication of textured alumina by high-temperature deformation
TL;DR: In this article, fine, disklike grains formed in the equiaxial fine-grained matrix during high-temperature deformation and aligned unidirectionally via material flow during deformation.
Journal ArticleDOI
Superplasticity of zirconia-alumina-spinel nanoceramic composite by spark plasma sintering of plasma sprayed powders
Xinzhang Zhou,Dustin M. Hulbert,Joshua D. Kuntz,R.K. Sadangi,Vijay Shukla,Bernard H. Kear,Amiya K. Mukherjee +6 more
TL;DR: In this article, a spark plasma sintering of plasma sprayed particles was used to synthesize a Zirconia 3-mol% yttria-alumina-aluminina-magnesia spinel nanoceramic composite, which showed superplasticity at temperatures between 1300 and 1450°C and at strain rates between 10−4 and 10−2 s−1.
References
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Journal ArticleDOI
Superplasticity—Recent advances and future directions
Oleg D. Sherby,Jeffrey Wadsworth +1 more
Journal ArticleDOI
Plastic creep flow effects in the diffusive cavitation of grain boundaries
Alan Needleman,James R. Rice +1 more
TL;DR: In this article, the growth of cavities along grain interfaces was analyzed by the combined processes of grain boundary diffusion and plastic dislocation creep in the adjoining grains, and it was shown that the coupling between the processes can be expressed in terms of a parameter L, which has the dimensions of length and which is a function of material properties, temperature and applied stress.
Journal ArticleDOI
Superplasticity of yttria-stabilized tetragonal ZrO2 polycrystals
TL;DR: In this article, the uniaxial tensile deformation behavior of 3 molpercent Y/sub 2/O/sub 3/-tetragonal ZrO/Sub 2/ polycrystals was studied at temperatures up to 1500 C in ambient atmosphere.
Journal ArticleDOI
Development of Superplastic Structural Ceramics
I-Wei Chen,Liang An Xue +1 more
TL;DR: Newnham et al. as mentioned in this paper showed that the selection of an appropriate phase and the tailoring of the grain boundary or liquid-phase composition can sometimes drastically alter the cavitation resistance.