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Superplastic forming of an α-phase rich silicon nitride

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Abstract

The deformation behavior of fine-grained, α-phase rich silicon nitride materials has been studied between 1823 and 1923 K, both in compression and in tension. It is first shown that the higher the α-phase content, the 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. Elongations of more than 80% were achieved for strain rates between 2.5 and 5 × 10−5 s−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 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.

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Authors and Affiliations

  1. Laboratoire de Matériaux Céramiques et Traitements de Surface, URA-CNRS 320, 47 av. A Thomas, 87065, Limoges Cedex, France

    Tanguy Rouxel, Fabrice Rossignol, Jean-Louis Besson & Paul Goursat

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  1. Tanguy Rouxel
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  2. Fabrice Rossignol
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  3. Jean-Louis Besson
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  4. Paul Goursat
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Rouxel, T., Rossignol, F., Besson, JL. et al. Superplastic forming of an α-phase rich silicon nitride. Journal of Materials Research 12, 480–492 (1997). https://doi.org/10.1557/JMR.1997.0070

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