Abstract
Several prior investigations have documented deformation-induced rotation of β-Si3N4 grains resulting in texture and property anisotropy. As documented previously for axisymmetric textures, Jeffery-based models correlate well with experimental results for a limited range of strains in plane strain deformation. Comparison to other experimental results and the implications of these results on texture modeling are discussed.
Highlights
Both the mechanical and thermal properties of silicon nitride (SiaN4) depend strongly on the orientation distribution of the elongated fl-Si3N grains in commercial cutting tools and engine parts
At a height reduction of 70% the model predicts a peak intensity of nearly 34 MRD, whereas the experimentally determined pole figure yields a peak of 8.7 MRD, Figure 7a
Texture dependency of plane-strain compression forging of silicon nitride was measured for varying height reductions
Summary
Both the mechanical and thermal properties of silicon nitride (SiaN4) depend strongly on the orientation distribution of the elongated fl-Si3N grains in commercial cutting tools and engine parts. Deformation of the bulk material, through methods such as axisymmetric compression, induces a preferred orientation of fl-Si3N4 grains that affects mechanical properties. In an earlier investigation on processing of fl-Si3N4, Lee and Bowman (1994) applied a hydrodynamic model developed by Jeffery (1922). This model describes the reorientation of non-interacting, rigid ellipsoids in an incompressible Newtonian flow. Experimental data and model predictions for axisymmetric compression agreed favorably for height reductions up to 60%. The present study is an application of the Jeffery approach to predict texture development in fl-Si3N4 with approximately 15 wt%
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