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首页> 外文期刊>Philosophical Magazine Letters >'Age-hardened alloy' based on bulk polycrystalline oxide ceramic
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'Age-hardened alloy' based on bulk polycrystalline oxide ceramic

机译：基于散装多晶氧化物陶瓷的“年龄硬化合金”

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摘要

We report here for the first time the development of 'age-hardened/toughened' ceramic alloy based on MgO in the bulk polycrystalline form. This route allows for the facile development of a 'near-ideal' microstructure characterized by the presence of nanosized and uniformly dispersed second-phase particles (MgFe2O4) within the matrix grains, as well as along the matrix grain boundaries, in a controlled manner. Furthermore, the intragranular second-phase particles are rendered coherent with the matrix (MgO). Development of such microstructural features for two-phase bulk polycrystalline ceramics is extremely challenging following the powder metallurgical route usually adopted for the development of bulk ceramic nanocomposites. Furthermore, unlike for the case of ceramic nanocomposites, the route adopted here does not necessitate the usage of nano-powder, pressure/electric field-assisted sintering techniques and inert/reducing atmosphere. The as-developed bulk polycrystalline MgO-MgFe2O4 alloys possess considerably improved hardness (by ~52%) and indentation toughness (by ~35%), as compared to phase pure MgO.
机译：我们在此报告首次在散装多晶形式的MgO基于MgO的“年龄硬化/增韧”陶瓷合金的发展。该途径允许通过基质晶粒内的存在纳米化和均匀分散的二相颗粒（MgFe2O4），以及沿基质晶界，以受控方式，该途径允许面部的展开发展。此外，鞘内的第二相颗粒与基质（MgO）相干。在通常采用散装陶瓷纳米复合材料的开发之后，对两相体积多晶陶瓷进行两相多晶陶瓷的这种微观结构特征非常具有挑战性。此外，与陶瓷纳米复合材料的情况不同，这里采用的途径不需要使用纳米粉末，压力/电场辅助烧结技术和惰性/还原气氛。与相纯MgO相比，起效散装多晶MgO-MgO-MgFe2O4合金具有显着提高的硬度（通过〜52％）和压痕韧性（通过〜35％）。

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