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首页> 外文期刊>Materials Science and Engineering >Compressive behavior of C_(sf)/AZ91D composites by liquid-solid extrusion directly following vacuum infiltration technique
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Compressive behavior of C_(sf)/AZ91D composites by liquid-solid extrusion directly following vacuum infiltration technique

机译：直接通过真空渗透技术通过液固挤出的C_（sf）/ AZ91D复合材料的压缩行为

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摘要

10 vol. % short carbon fiber reinforced AZ91D composites (C_(sf)/AZ91D) were fabricated by liquid-solid extrusion directly following vacuum infiltration (LSEVI) technique. Liquid-solid extrusion of the composite induced reasonably uniform distribution and oriented arrangement of the carbon fibers. Compressive behaviors of the composites were investigated in the temperature range from room temperature to 300 ℃. The shapes of the compressive stress-strain curves at temperatures below and above 200 ℃ are very different, which can be attributed to the combined influence of matrix work hardening and strain softening induced by the rotation of the fibers. The ultimate compressive strength (UCS) and compressive yield strength (CYS) of the composites are enhanced by 86.5% and 123% than those of matrix alloy at room temperature, respectively. The composites are thermal stable up to 200 ℃, where the CYS is approximately 2.8 times as high as that of the AZ91D matrix. However, both the UCS and CYS of the composites are slightly less than those of monolithic AZ91D at 300 ℃. The plastic deformation of the C_(sf)f/AZ91D composites mainly localizes in a shear band along the diagonal axis, 45° to the loading axis at the center of samples. The main failure mechanism of the composite samples is shear fracture or plasticity instability induced by shear deformation, and the failure strain increases with the increasing test temperature.
机译：10卷％短碳纤维增强的AZ91D复合材料（C_（sf）/ AZ91D）是直接通过真空渗透（LSEVI）技术通过液-固挤压法制备的。复合材料的液-固挤压导致碳纤维合理地均匀分布和定向排列。在室温至300℃的温度范围内研究了复合材料的压缩行为。在200℃以下的温度下，压缩应力-应变曲线的形状差异很大，这可以归因于纤维旋转引起的基体功硬化和应变软化的综合影响。在室温下，复合材料的极限抗压强度（UCS）和抗压屈服强度（CYS）分别比基体合金提高了86.5％和123％。该复合材料在高达200℃的温度下具有热稳定性，其中CYS约为AZ91D基质的2.8倍。然而，复合材料的UCS和CYS在300℃时均比整体式AZ91D小。 C_（sf）f / AZ91D复合材料的塑性变形主要集中在剪切带上，该剪切带沿对角轴与样品中心的加载轴成45°角。复合材料样品的主要破坏机理是剪切变形或剪切变形引起的塑性不稳定性，破坏应变随着测试温度的升高而增加。

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  • 来源
    《Materials Science and Engineering》 |2012年第1期|p.164-170|共7页
  • 作者

    J. Liu; LH. Qi; J.T. Guan; Y.Q. Ma; J.M. Zhou;

  • 作者单位

    School of Mechatronic Engineering, Northwestern Polytechnical University. Xi'an 710072, PR China;

    School of Mechatronic Engineering, Northwestern Polytechnical University. Xi'an 710072, PR China,Education Ministry Key Laboratory of Modern Design and Integrated Manufacturing Technology, Northwestern Polytechnical University, Xi'an 710072, PR China;

    School of Mechatronic Engineering, Northwestern Polytechnical University. Xi'an 710072, PR China;

    School of Mechatronic Engineering, Northwestern Polytechnical University. Xi'an 710072, PR China;

    School of Mechatronic Engineering, Northwestern Polytechnical University. Xi'an 710072, PR China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    magnesium matrix composites; liquid-solid extrusion; compressive behavior; microstructure; strengthening mechanism;

    机译：镁基复合材料;液固挤出压缩行为微观结构强化机制;

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