标题：Influence of Y2O3addition on the Ti/Al2O3cermets by hot pressing sintering
作者：Shi, Guopu ;Wang, Zhi ;Liu, Luhao ;Wang, Chenguo
作者机构：[Shi, Guopu ;Wang, Chenguo ] School of Material Science and Engineering, Shandong University, Jinan; 250061, China;[Wang, Zhi ;Liu, Luhao ] School of 更多
来源：Journal of Alloys and Compounds
摘要：The Ti/Al2O3composites are fabricated by hot pressing sintering, and the effect of Y2O3on the microstructure and mechanical property of Ti/Al2O3composites has been studied by means of SEM, EDS and XRD. The results show that the Al2O3decomposition to Al and O first, and then Al diffusion to Ti formed the intermetallics such as Ti3Al and TiAl phases in the composites. Thermodynamics calculation shows us the Gibbs free energy are -120.23 kJ/mol and -73.44 kJ/mol for Ti3Al phase and TiAl phase, respectively. The addition of yttria to the composites makes enthalpy changes, reduces the amount of Ti3Al phase. The effect of Y2O3addition on the microstructures and mechanical properties of the Ti/Al2O3composite was characterized. When the Y2O3content is 1.0 vol%, the flexural strength, fracture toughness, Vickers hardness and relative density of the composite reach the maximum values of 302.73 MPa, 6.45 MPa m-1/2, 16.78 GPa and 98.63%, respectively, and the fracture mode changes from intergranular to transgranular.
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