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首页> 外文期刊>Materials Science and Engineering >Influences of carbon additions on reaction mechanisms and tensile properties of Al-based composites synthesized in-situ by Al-SiO_2 powder system
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Influences of carbon additions on reaction mechanisms and tensile properties of Al-based composites synthesized in-situ by Al-SiO_2 powder system

机译：碳添加对Al-SiO_2粉末体系原位合成Al基复合材料反应机理和拉伸性能的影响

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摘要

The effects of carbon additions on reaction mechanisms and mechanical properties of Al-based composites fabricated in-situ through Al-SiO_2 system were studied by differential scanning calorimetry (DSC), X-ray diffraction (XRD), scanning electron microscopy (SEM), and X-ray energy dispersive spectroscopy (EDS). It was found that when the powder of C was added into the Al-SiO_2 system, Al first reacted with SiO_2 to form the α-Al_2O_3 and Si. Some of the Si then reacted with the C to form the SiC, and the remaining Si dissolved into Al to form the Al-Si alloy. Based on the DSC curves obtained from five different heating rates, the apparent activation energy for the synthesis of the new composites was calculated and found to be 309 kJ/mol, which was larger than that of Al-SiO_2 system that yielded the same reinforcement volume fraction of 30%. As compared with the reference materials prepared from the Al-SiO_2 system, the morphology of Si in the new composites changed from a large block to a needle-like shape. Moreover, the tensile strength and ductility of the new materials increased from 165 MPa and 3.95% to 208 MPa and 4.20%, respectively.
机译：通过差示扫描量热法（DSC），X射线衍射（XRD），扫描电子显微镜（SEM）研究了碳添加对通过Al-SiO_2系统原位制备的Al基复合材料的反应机理和力学性能的影响，和X射线能量色散光谱（EDS）。发现当将C的粉末添加到Al-SiO_2体系中时，Al首先与SiO_2反应形成α-Al_2O_3和Si。然后，一些Si与C反应形成SiC，剩余的Si溶解到Al中形成Al-Si合金。根据从五种不同加热速率获得的DSC曲线，计算出合成新复合材料的表观活化能，发现为309 kJ / mol，比产生相同补强体积的Al-SiO_2体系的表观活化能大。比例为30％。与由Al-SiO_2系统制备的参考材料相比，新复合材料中Si的形态从大块状变为针状。此外，新材料的抗拉强度和延展性分别从165 MPa和3.95％提高到208 MPa和4.20％。

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  • 来源
    《Materials Science and Engineering》 |2015年第19期|78-82|共5页
  • 作者

    Heguo Zhu; Guanhong Guo; Tao Cui; Jiewen Huang; Jianliang Li; Zonghan Xie;

  • 作者单位

    College of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, PR China;

    College of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, PR China;

    College of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, PR China;

    College of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, PR China;

    College of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, PR China;

    School of Mechanical Engineering, University of Adelaide, SA 5005, Australia,School of Materials Science and Engineering, Tianjin Polytechnic University, Tianjin 300387, PR China;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    Aluminum matrix composites; Reaction mechanism; Apparent activation energy; Tensile strength; Fracture surface;

    机译：铝基复合材料;反应机理;表观活化能;抗拉强度;断裂面;

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