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Superplastic forming of an α-phase rich silicon nitride

Published online by Cambridge University Press:  31 January 2011

Tanguy Rouxel ,
Fabrice Rossignol ,
Jean-Louis Besson  and
Paul Goursat
Tanguy Rouxel
Affiliation:
Laboratoire de Matériaux Céramiques et Traitements de Surface, URA-CNRS 320, 47 av. A Thomas, 87065 Limoges Cedex, France
Fabrice Rossignol
Affiliation:
Laboratoire de Matériaux Céramiques et Traitements de Surface, URA-CNRS 320, 47 av. A Thomas, 87065 Limoges Cedex, France
Jean-Louis Besson
Affiliation:
Laboratoire de Matériaux Céramiques et Traitements de Surface, URA-CNRS 320, 47 av. A Thomas, 87065 Limoges Cedex, France
Paul Goursat
Affiliation:
Laboratoire de Matériaux Céramiques et Traitements de Surface, URA-CNRS 320, 47 av. A Thomas, 87065 Limoges Cedex, France
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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.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 2 , February 1997 , pp. 480 - 492
Copyright
Copyright © Materials Research Society 1997

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References

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