Effect of MgAl2O4 Spinel Dispersion on High-Strain-Rate Superplasticity in Tetragonal ZrO2 Polycrystal
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- Morita Koji
- National Institute for Materials Science
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- Hiraga Keijiro
- National Institute for Materials Science
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- Kim Byung-Nam
- National Institute for Materials Science
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- Sakka Yoshio
- National Institute for Materials Science
書誌事項
- タイトル別名
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- Effect of MgAl<SUB>2</SUB>O<SUB>4</SUB> Spinel Dispersion on High-Strain-Rate Superplasticity in Tetragonal ZrO<SUB>2</SUB> Polycrystal
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The effect of second phase dispersion on high-strain-rate superplasticity was examined in tetragonal ZrO2 dispersed with 30 vol% MgAl2O4 spinel. The spinel particle enhances the diffusivity of ZrO2 by supplying small amounts of aluminum and magnesium into ZrO2 and suppresses grain growth by grain boundary pinning. After superplastic flow, the spinel particles highly elongate along the tensile direction. In the spinel particles, intragranular dislocations were observed, indicating that the spinel particles may contribute to the relaxation of stress concentrations around grain junctions exerted by grain boundary sliding. Comparison with earlier studies suggests that the dispersion of spinel particles can attain high-strain-rate superplasticity in tetragonal ZrO2 through providing the following positive factors simultaneously; (i) the suppressed grain growth, enhanced accommodation process due to the accelerated (ii) diffusivity and (iii) stress relaxation.
収録刊行物
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- MATERIALS TRANSACTIONS
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MATERIALS TRANSACTIONS 45 (7), 2073-2077, 2004
公益社団法人 日本金属学会
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詳細情報 詳細情報について
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- CRID
- 1390282679228167936
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- NII論文ID
- 10013336565
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- NII書誌ID
- AA1151294X
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- COI
- 1:CAS:528:DC%2BD2cXmvFejs7g%3D
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- ISSN
- 13475320
- 13459678
- http://id.crossref.org/issn/09161821
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- NDL書誌ID
- 7015697
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可