Microstructural examination in high-strain-rate superplastically deformed tetragonal ZrO_2 dispersed with 30 vol% MgAl_2O_4 spinel

Koji Morita; Keijiro Hiraga; Byung-Nam Kim; Yoshio Sakka

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Microstructural examination in high-strain-rate superplastically deformed tetragonal ZrO_2 dispersed with 30 vol% MgAl_2O_4 spinel

机译：30％（体积）MgAl_2O_4尖晶石分散的高应变率超塑性变形四方ZrO_2的显微组织检查

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The role of MgAl_2O_4 spinel particle dispersion for attaining high-strain-rate superplasticity (HSRS) was examined in tetragonal ZrO_2. Microstructural examination shows that the dispersed spinel particles provide the following positive factors to ZrO_2 simultaneously: (ⅰ) stable fine grain size by retarding grain growth due to pinning effect; and (ⅱ) enhanced accommodation due to accelerated lattice diffusivity caused by the dissolution of aluminum and magnesium into ZrO_2 from the spinel particles, and accelerated relaxation of stress concentrations exerted by grain boundary sliding through dislocation motion. These positive factors make it possible to attain HSRS in ZrO_2.

机译：在四方ZrO_2中研究了MgAl_2O_4尖晶石颗粒分散体在获得高应变速率超塑性（HSRS）中的作用。显微组织检查表明，分散的尖晶石颗粒同时为ZrO_2提供了以下积极因素：（ⅱ）由于铝和镁从尖晶石颗粒溶解到ZrO_2中而引起的加速晶格扩散，以及由于位错运动引起的晶界滑动所引起的应力集中的加速弛豫而增强了适应性。这些积极因素使得有可能在ZrO_2中获得HSRS。

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来源
《Journal of Materials Research》 |2007年第3期|p.801-813|共13页
作者
Koji Morita; Keijiro Hiraga; Byung-Nam Kim; Yoshio Sakka;
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作者单位

National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
原文格式 PDF
正文语种 eng
中图分类工程材料学;
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外文文献

1. Effect of MgAl_2O_4 Spinel Dispersion on High-Strain-Rate Superplasticity in Tetragonal ZrO_2 Polycrystal [J] . Koji Morita, Keijiro Hiraga, Byung-Nam Kim Materials transactions . 2004,第7期

机译：MgAl_2O_4尖晶石分散体对四方ZrO_2多晶体高应变速率超塑性的影响
2. Yield drop in high-strain-rate superplastic deformation of ZrO_2-30 vol% MgAl_2O_4 spinel composite [J] . K. Morita, B.-N. Kim, K. Hiraga, Philosophical Magazine Letters . 2003,第9期

机译：ZrO_2-30 vol％MgAl_2O_4尖晶石复合材料高应变率超塑性变形的屈服下降
3. Effect of MgAl{sub}2O{sub}4 Spinel Dispersion on High-Strain-Rate Superplasticity in Tetragonal ZrO{sub}2 Polycrystal [J] . Koji Morita, Keijiro Hiraga, Byung-Nam Kim, Materials transactions . 2004,第7期

机译：MgAl {sub} 2O {sub} 4尖晶石分散体对四方ZrO {sub} 2多晶高应变率超塑性的影响
4. High-Strain-Rate Superplasticity in 3mol-Y_2O_3-Stabilized Tetragonal ZrO_2 Dispersed with 30vol MgAl_2O_4 Spinel [C] . K. Morita, B.-N. Kim, K. Hiraga, International Conference on Superplasticity in Advanced Materials(ICSAM 2003); 20030728-30; Oxford(GB) . 2003

机译：含30vol％MgAl_2O_4尖晶石的3mol％-Y_2O_3-稳定的四方ZrO_2中的高应变率超塑性
5. High-Strain-Rate Superplastic Flow Mechanism in ZrO2-30vol Spinel Two-Phase Composite [O] . Koji Morita, Kiraga Hiraga, Byung-nam Kim, 2016

机译：ZrO2-30vol％尖晶石两相复合材料的高应变速率超流动机理

Microstructural examination in high-strain-rate superplastically deformed tetragonal ZrO_2 dispersed with 30 vol% MgAl_2O_4 spinel

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