陈国清

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教授

博士生导师

硕士生导师

主要任职:材料科学与工程学院副院长

性别:男

毕业院校:哈尔滨工业大学

学位:博士

所在单位:材料科学与工程学院

办公地点:铸造中心208

联系方式:0411-84707970

电子邮箱:gqchen@dlut.edu.cn

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Effect of superplastic deformation on the properties of zirconia dispersed alumina nanocomposite

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论文类型:会议论文

发表时间:2007-01-01

收录刊物:CPCI-S

卷号:551-552

页面范围:527-+

关键字:superplastic extrusion; mechanical properties; ZrO2-Al2O3; nanocomposite

摘要:In this paper constrained extrusion of the zirconia dispersed alumina nanocomposite under superplastic conditions was conducted. The mechanical properties of deformed material were studied and its results were compared with those of the initial materials. The microstructure evolution during superplastic deformation was also analyzed. The results demonstrated that after superplastic extrusion the flexural strength, relative density, Vickers hardness as well as fracture toughness of the material increased noticeably. The flexural strength of the deformed composite even retained at a high value of 310MPa at 800 degrees C. The fracture toughness of the material increased from 6.92 MPa.m(1/2) to 8.87 MPa.m(1/2) after deformation. After superplastic extrusion due to grain boundary sliding and the compressive stress state, the internal porosities in as-sintered materials were eliminated. During extrusion with grain coarsening the effect of t-ZrO2 to m-ZrO2 transformation toughening increased because more zirconia grains reached the critical dimension. Although grain coarsening may cause the decrease of the fracture toughness in some extent, the phase transformation toughening and strengthening dominated. As a result, the mechanical properties of the deformed material were improved.