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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Microstructure and mechanical properties of in-situ nano gamma-Al2O3p/A356 aluminum matrix composite
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Microstructure and mechanical properties of in-situ nano gamma-Al2O3p/A356 aluminum matrix composite

机译：原位纳米γ-AL2O3P / A356铝基复合材料的组织和力学性能

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In this study, the nanometer in-situ gamma-Al2O3 particles reinforced aluminum matrix composites was successfully fabricated by the A356 aluminum alloy and Co3O4 powder at 850 degrees C by means of in-situ reaction in the high temperature melt. The effects of gamma-Al2O3 particle and cobalt element on the microstructure and properties of the composites were investigated in detail. The endogenous gamma-Al2O3 and cobalt could modify the coarse plate like eutectic Si into fine fibrous like and refine the second dendrite arm spacing (SDAS) of the grains simultaneously. When the content of cobalt was lower than 0.57% and content of gamma-Al(2)O(3)particles was lower than 0.6 vol%, the particles distributed uniformly in the grain, however, when the particulate amount was up to 0.8 vol%, the particles would distribute at the grains boundaries or form as a rodlike phase. The grain size was sharply refined to 200 mm when the particulate content was 0.8 vol%. It was found that the ultimate tensile strength (UTS), elongation of the 0.6 vol% gamma-Al2O3/A356 composites had arrived at the maximum that had enhanced by 43.6% and 85.7% in comparison to the matrix respectively, which were attributed to the homogeneous distribution of the nanoparticles, the refinement of the SDAS of the alpha-Al grains and the modification of the eutectic Si phases. (C) 2019 Elsevier B.V. All rights reserved.
机译：在这项研究中，纳米原位伽马氧化铝颗粒增强铝基复合材料已成功由A356铝合金和Co3O4粉末通过在高温熔化的原位反应的方式制造在850摄氏度。在微观结构和复合材料性能的γ-Al2O3的粒子和钴元素的影响进行了详细的调查。内源的γ-Al2O3的和钴可以修改粗板状的共晶Si为细纤维等，并且同时细化晶粒的第二枝晶臂间距（SDAS）。当钴的含量低于0.57％和γ-Al系的含量（2）O（3）的颗粒低于0.6体积％，但是在晶均匀分布，颗粒，当颗粒量为最多0.8体积％，所述颗粒将在晶粒边界散布或形成为棒状相。晶粒尺寸急剧细化至200mm当颗粒的含量为0.8体积％。结果发现，在极限拉伸强度（UTS），伸长率的0.6体积％的γ-氧化铝/ A356复合材料在那个已43.6％和85.7％相比，矩阵分别提高了最大，这归因于所述已抵达所述纳米颗粒的均匀分布，α-Al系晶粒的SDAS的细化和共晶硅相的修饰。 （c）2019 Elsevier B.v.保留所有权利。

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