Tensile ductility behavior of superplastic ceramics
- Authors
- Kim, WJ; Sherby, OD
- Issue Date
- 2000
- Publisher
- MINERALS, METALS & MATERIALS SOC
- Citation
- DEFORMATION, PROCESSING, AND PROPERTIES OF STRUCTURAL MATERIALS, pp.269 - 276
- Journal Title
- DEFORMATION, PROCESSING, AND PROPERTIES OF STRUCTURAL MATERIALS
- Start Page
- 269
- End Page
- 276
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/27960
- Abstract
- The tensile elongation of fine-grained ceramics has been examined as function of flow stress and grain size. It is shown that tensile elongation is a strong function of flow stress increasing with decreasing flow stress, even though the values of strain-rate-sensitivity exponent remain high. The tensile ductility dependence on grain size was also investigated for many fine-grained ceramics either under a constant strain rate condition or a constant stress condition. It was found that large increase of tensile ductility with the decrease of grain size under a constant strain rate, is primarily attributed to the decrease in flow stress accompanying grain size refinement. When temperature is sufficiently high, however, superplastic ceramics show superplastic metallic-like behavior. This variation of tensile elongation behavior is attributed to the change in damage evolution mode from crack formation to cavity-stringer formation.
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Collections - Graduate School > Materials Science and Engineering > 1. Journal Articles
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