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Superplastic Forming of an α-Phase Rich Silicon Nitride
Abstract The deformation behavior of fine-grained α-phase rich silicon nitride materials has been studied between 1550°C and 1615°C, both in compression and in tension. First, it is shown that higher the α-phase content, better the superplastic forming ability. A large tension-compression flow asymmetry was evidenced. For instance, shear-thickening flow shows up in compression whereas shear-thinning is observed in tension. Furthermore, much higher flow stresses and hardening rates are reported in compression than in tension. Elongation of more than 80% were achieved for strain rates between 2.5 and 5×10−5S−1. In the light of our results and of the abundant literature dealing with the high temperature deformation in silicon nitride, a sketch of the different deformation stages is proposed, which emphasizes the tension-compression flow asymmetry. Starting from the promising results obtained at the laboratory scale, the feasibility for net-shaping of a real part was demonstrated by hot-forging of a parabolic shell.
Superplastic Forming of an α-Phase Rich Silicon Nitride
Abstract The deformation behavior of fine-grained α-phase rich silicon nitride materials has been studied between 1550°C and 1615°C, both in compression and in tension. First, it is shown that higher the α-phase content, better the superplastic forming ability. A large tension-compression flow asymmetry was evidenced. For instance, shear-thickening flow shows up in compression whereas shear-thinning is observed in tension. Furthermore, much higher flow stresses and hardening rates are reported in compression than in tension. Elongation of more than 80% were achieved for strain rates between 2.5 and 5×10−5S−1. In the light of our results and of the abundant literature dealing with the high temperature deformation in silicon nitride, a sketch of the different deformation stages is proposed, which emphasizes the tension-compression flow asymmetry. Starting from the promising results obtained at the laboratory scale, the feasibility for net-shaping of a real part was demonstrated by hot-forging of a parabolic shell.
Superplastic Forming of an α-Phase Rich Silicon Nitride
Rouxel, T. (Autor:in) / Rossignol, F. (Autor:in) / Besson, J. L. (Autor:in) / Goursat, P. (Autor:in) / Lespade, P. (Autor:in)
01.01.1997
7 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
Silicon Nitride , Tensile Axis , High Temperature Deformation , Transient Liquid Phase , Cavitation Damage Engineering , Industrial and Production Engineering , Materials Science, general , Ceramics, Glass, Composites, Natural Methods , Characterization and Evaluation of Materials , Inorganic Chemistry
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