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Mechanical properties of metal reinforced-Al_2O_3 based micro and nanocomposites

机译：基于金属增强-AL_2O_3的微纳米复合材料的机械性能

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This work attempts to explain the mechanical improvements observed in a brittle matrix reinforced with ductile particles. The effects of the inclusion size as well as the thermal expansion mismatch between the ceramic and the metallic phases (Δα=α_m-α_p) are investigated. In order to carry out this study, four sets of materials were synthesized and characterized: Regarding the effect of the thermal mismatch, Al_2O_3/Ni and Al_2O_3/Mo composites with oppositeΔα were studied. For a given system, two synthesis route were also considered. When the metal is incorporated into the matrix through a gas reduction process, the mean particle size in the sintered samples is relatively small (typical nanosized particles). However, when the composite is obtained through a mixture of alumina and metal powders, a larger particle size is obtained. These composites with different microstructures allow us to investigate the effect of the inclusion size on the mechanical properties.
机译：该工作试图解释用韧性颗粒加固的脆性基质中观察到的机械改进。研究了包含尺寸的效果以及陶瓷和金属相之间的热膨胀失配（Δ=α_M-α_P）。为了进行这项研究，已经合成了四组材料和表征：关于热失配，研究了与相对Δα的al_2O_3 / Ni和Al_2O_3 / Mo复合材料。对于给定的系统，还考虑了两个合成途径。当金属通过气体还原过程掺入基质中时，烧结样品中的平均粒度相对较小（典型的纳米颗粒）。然而，当通过氧化铝和金属粉末的混合物获得复合材料时，获得更大的粒度。具有不同微结构的这些复合材料允许我们研究包含尺寸对机械性能的影响。

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