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DTIC ADA290817: Superplastic Ceramics. |
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by Defense Technical Information Center |
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Superplasticity is a newly observed phenomenon in |
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ceramics, with the first publication appearing in 1986. |
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The current program has centered on an experimental study |
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of superplasticity in polycrystalline iron carbide. This |
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material has been made superplastic by utilization of two |
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processing methods: powder processing and ingot- |
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processing. In both cases the end microstructure is a |
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continuous phase of ultra-fine grained iron carbide. The |
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ultra-fine grained powder processed material was |
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successfully gas-pressure blow-formed into a spherical |
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shaped object, and its deformation followed the predicted |
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behavior of a high strain-rate sensitive material that is |
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controlled by grain-boundary sliding. Thermo-mechanical |
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processing routes were developed to refine the coarse as- |
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cast ingot microstructure. Structural refinement is a |
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result of creation of strain-free regions by carbon |
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dissolution from high strain energy subgrain boundaries |
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and slip bands. It is proposed that thermomechanical |
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processing of ingot-cast eutectic-composition oxide |
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ceramics to achieve a superplastic structure is feasible. |
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(jg) |
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Date Published: 2018-03-22 07:03:59 |
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Identifier: DTIC_ADA290817 |
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Item Size: 9137389 |
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Language: english |
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Media Type: texts |
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# Topics |
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DTIC Archive; Sherby, Oleg D.; STANFO... |
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