Microstructure and mechanical properties of Al2O3/TiAl composite

艾桃桃; 王芬; 朱建锋

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Microstructure and mechanical properties of Al2O3/TiAl composite

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＜正＞Al2O3/TiAl composites were fabricated by PAXD （pressure-assisted exothermic dispersion） method. The effects of Nb2O5 content on the microstructure and mechanical properties of the composites were investigated. The results show that the ultimate phases of the composite consist of TiAl, Ti3Al, Al2O3 and a small amount of NbAl3. SEM reveals that a submicronγ+（α2/γ） dual phases structure can be presented after sintered at 1 200℃. Furthermore, with the increase of Nb2O5 content,the ratio of TiAl to Ti3Al phase decreases correspondingly, the grains of the composites are remarkably refined, and the produced Al2O3 particles are uniformly dispersed. When 6% Nb2O5 is added, the composite has the best comprehensive properties. It exhibits a Vickers hardness of 4.77 GPa and a bending strength of 642 MPa. Grain-refinement and dispersion-strengthening are the main strengthening mechanisms.

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《中国有色金属学报：英文版》 |2006年第s3期|1924-1927|共4页
作者
艾桃桃; 王芬; 朱建锋;
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作者单位

School of Materials Science and Engineering Shaanxi University of Science and Technology;

Xianyang 712081;

China;

School of Materials Science and Engineering;

Shaanxi University of Science and Technology;

Xianyang 712081;

China;

School of Materials Science and E;

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原文格式 PDF
正文语种 chi
中图分类金属复合材料;
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机译：放热分散;Al2O3 / TiAl复合材料;显微组织;力学性能;

Microstructure and mechanical properties of Al2O3/TiAl composite

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