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首页> 外文期刊>Metallurgical and Materials Transactions B >Improvement of Mechanical Properties in the Functionally Graded Aluminum Matrix Nanocomposites Fabricated via a Novel Multistep Friction Stir Processing
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Improvement of Mechanical Properties in the Functionally Graded Aluminum Matrix Nanocomposites Fabricated via a Novel Multistep Friction Stir Processing

机译：通过新型多步摩擦搅拌工艺制备的功能梯度铝基纳米复合材料的力学性能的改善

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摘要

In the present study, the functionally graded bulk Al-SiC nanocomposites were successfully fabricated by applying a novel multistep friction stir processing. Microstructural observations by scanning electron microscope indicated a proper distribution of SiC nanoparticles in the Al 6061 matrix. Microhardness profiles descended to 50 from 160 Hv due to the formation of compositionally gradient of SiC nanoparticles along the thickness. The tensile behavior of graded samples revealed a simultaneous enhancement of ultimate tensile strength (44 pct), strain at maximum stress (244 pct), and work of fracture (492 pct) with respect to the homogeneous sample. Furthermore, the graded samples sustained up to 4 pct strain after initiation of primary cracking, while the catastrophic fracture occurred instantly after cracking in the homogenous sample. A dimple-like ductile fracture surface was observed for the graded layers in which an increase in the SiC particle content will result in smaller dimple size.
机译：在本研究中，通过应用新型的多步摩擦搅拌工艺成功地制备了功能梯度的块状Al-SiC纳米复合材料。扫描电子显微镜的显微结构观察表明，SiC纳米颗粒在Al 6061基体中有适当的分布。由于SiC纳米颗粒沿厚度方向的成分梯度形成，因此显微硬度轮廓从160 Hv下降至50。分级样品的拉伸行为显示出相对于均质样品的极限拉伸强度（44pct），最大应力下的应变（244pct）和断裂功（492pct）同时增强。此外，初次开裂后，分级后的样品可承受高达4 pct的应变，而同质样品开裂后会立即发生灾难性断裂。对于梯度层观察到了凹痕状的韧性断裂表面，其中SiC颗粒含量的增加将导致较小的凹痕尺寸。

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    《Metallurgical and Materials Transactions B》 |2015年第1期|20-29|共10页
  • 作者

    Mojtaba Salehi; Hamidreza Farnoush; Arash Heydarian; Jamshid Aghazadeh Mohandesi;

  • 作者单位

    Department of Mining and Metallurgical Engineering Amirkabir University of Technology">(1);

    Department of Metallurgy and Materials Engineering Faculty of Engineering University of Kashan">(2);

    Department of Mining and Metallurgical Engineering Amirkabir University of Technology">(1);

    Department of Mining and Metallurgical Engineering Amirkabir University of Technology">(1);

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