Y-TZP/Al<sub><font size="-1">2</font></sub>O<sub><font size="-1">3</font></sub>複合体の高温変形機構
書誌事項
- タイトル別名
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- High-Temperature Deformation Mechanism of Y-TZP-Al<sub><font size="-1">2</font></sub>O<sub><font size="-1">3</font></sub> Composites
- Y-TZP/Al₂O₃複合体の高温変形機構
- Y-TZP/Al ₂ O ₃ フクゴウタイ ノ コウオン ヘンケイ キコウ
- High-Temperature Deformation Mechanism of Y-TZP-Al2O3 Composites
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Yttria-stabilized tetragonal zirconia (Y-TZP) and fine-grained alumina deform plastically at high temperatures and the mechanisms have been studied. Y-TZP shows superplastic behavior with extensive grain boundary sliding. On the other hand, Al2O3 possibly deforms by diffusional creep which is limited by interface reaction. Thus, a number of studies about deformation of ceramic materials have been reported, however, its mechanism has not yet been fully clarified. In this study, sintered Y-TZP-Al2O3 composite samples were prepared, and in order to examine its behaviors in a wide range of stress (∼2 to 350MPa), the specimens were used for three kinds of deformation tests : constant cross head speed compressive test, constant load compressive test and bending creep test. The results of strain rate έ vs true stress σ on a logarithmic scale, which generally determines stress exponent n, revealed four stages of flow (region I∼IV) exhibiting a sigmoidal curve. This indicates that the behaviors change from diffusional creep with n∼1 in region I at low stresses through a transition state with n >3 in region II at intermediate stresses and to superplasticity with n∼2 in region III at high stresses. The decrease in n with increasing stress from ∼2 in region III to ∼1.5 in region IV implies that diffusional creep tends to be dominant at higher stress. Furthermore, the increase in n from ∼2 in region III to >3 in region II suggests the occurrence of a threshold stress σ0 for superplastic flow. From the results of έ vs σ0 with different grain sizes, as the grain size is larger, the stress exponent n in region II seems to decrease gradually with increasing grain size, suggesting that threshold stress σ0 decreases with grain size.
収録刊行物
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- 材料
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材料 62 (6), 367-372, 2013
公益社団法人 日本材料学会
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詳細情報 詳細情報について
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- CRID
- 1390282680422864640
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- NII論文ID
- 130003367185
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- NII書誌ID
- AN00096175
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- COI
- 1:CAS:528:DC%2BC3sXhtlagsL%2FI
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- ISSN
- 18807488
- 05145163
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- NDL書誌ID
- 024708418
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- NDL
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- 使用不可