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Mechanical behavior of deformable particles reinforced Al matrix composites

机译：可变形颗粒加强Al基复合材料的力学行为

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摘要

Metal matrix composite reinforced by ceramic particles generally demonstrated a significant improvement in strength, while its ductility is suppressed sharply due to the incompatible deformation between matrix and rigid reinforcements. In this work, the SiCp/2024Al composites particles have been used as deformable reinforcement, which has lower elastic modulus and considerable elongation. Three Al alloys (1050A1, 2024A1, and 7A60A1) have been used as the matrix, respectively. Compared with the uniformly distributed SiCp/Al composites with the same SiC particle amount (30 vol%), the deformable particle/2024Al composites showed comparable tensile strength and higher toughness. In-situ strain observation, fracture surface analysis, and finite element method simulation proved the main deformation mechanism in the composite shifts with the increase of matrix strength. For low-strength matrix, strain concentration occurred in the matrix, while for high-strength matrix, reinforcements could also undergo plastic deformation. It could be inferred that uneven strain distribution and stress localization could be alleviated, even avoided for composites with designed ductile reinforcement, which are crucial factors for composites' ductility and machinability. A semi-empirical model was derived from statistics to describe the strengthening behavior of the composites reinforced by deformable particles. Further discussion revealed that the optimal value of the ratio between the yield strength (YS) of reinforcement and the matrix (σ_(Py)/σ_(my)) exists, by which the strength of the composite reaches the maximum value. Accordingly, the optimal ratio could be rationalized by experiments that uniform strain distribution was observed in the deformable particle/2024Al composites.
机译：由陶瓷颗粒加强的金属基质复合材料通常表现出强度的显着改善，而由于基质和刚性增强件之间的变形不相容，其延展性急剧抑制。在这项工作中，SICP / 2024AL复合材料颗粒已被用作可变形的加强件，其具有较低的弹性模量和相当大的伸长率。三种Al合金（1050A1,2024A1和7A60A1）分别用作基质。与具有相同SiC粒子量的均匀分布的SiCP / Al复合材料相比（30体积％），可变形颗粒/ 2024A1复合材料显示出相当的拉伸强度和更高的韧性。原位应变观察，断裂表面分析和有限元方法模拟在基质强度的增加中证明了复合变形的主要变形机制。对于低强度矩阵，在基质中发生应变浓度，而对于高强度基质，增强件也可以进行塑性变形。可以推断出可以缓解不均匀的应变分布和应力定位，甚至可以避免具有设计的延性加固的复合材料，这是复合材料延展性和可加工性的关键因素。衍生自统计学模型，以描述通过可变形颗粒增强的复合材料的强化行为。进一步的讨论表明，存在增强件和基质的屈服强度（ys）之间的比率（σ_（py）/σ_（my）），其中复合材料的强度达到最大值。因此，通过实验可以通过在可变形粒子/ 2024A1复合材料中观察到均匀的应变分布来合理化最佳比率。

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  • 来源
    《Materials Science and Engineering》 |2021年第4期|140815.1-140815.13|共13页
  • 作者

    Tan Xin; Liu Kai; Wang Zhixuan; Yan Xiaobo; Yang Wenshu; Wu Gaohui;

  • 作者单位

    School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China CECEP Environmental Protection Equipment Co. Ltd Beijing 100082 China;

    School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China;

    School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China;

    CECEP Environmental Protection Equipment Co. Ltd Beijing 100082 China;

    School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China Key Laboratory of Advanced Structure-Function Integrated Materials and Green Manufacturing Technology School of Material Science and Engineering Harbin Institute of Technology Harbin 150001 China;

    School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China Key Laboratory of Advanced Structure-Function Integrated Materials and Green Manufacturing Technology School of Material Science and Engineering Harbin Institute of Technology Harbin 150001 China;

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  • 正文语种 eng
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  • 关键词

    Metal matrix composites; Deformable reinforcement; Al matrix composite; Strain distribution; Strengthening model;

    机译：金属基复合材料;可变形钢筋;Al Matrix复合材料;应变分布;加强模型;

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