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首页> 外文期刊>Materials Science and Engineering >Effects of nano-Al_2O_3 particle addition on grain structure evolution and mechanical behaviour of friction-stir-processed Al
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Effects of nano-Al_2O_3 particle addition on grain structure evolution and mechanical behaviour of friction-stir-processed Al

机译：纳米Al_2O_3的添加对搅拌摩擦加工Al晶粒组织演变和力学行为的影响

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摘要

The fabrication of nano-composites is quite challenging because the uniform dispersion of nano-sized reinforcements in metallic substrates is difficult to achieve using powder metallurgy or liquid processing methods. In the present study, Al-based nano-composites reinforced with Al_2O_3 particles have been successfully fabricated using friction stir processing. The effects nano-Al_2O_3 particle addition on the evolution of the grain structure and mechanical behaviour of a friction-stir-processed Al matrix were studied and discussed in detail. It was revealed that the pinning effect of Al_2O_3 particles retarded grain growth following recrystallisation during FSP and led to a more pronounced reduction in grain size. Significant increases in the microhardness and tensile strength relative to Al under the same conditions were obtained by adding Al_2O_3 particles. A microstructural examination suggested that the voids initiated from the A1/Al_2O_3 interfaces during testing of the tensile strength of the nano-composites.
机译：纳米复合材料的制造非常具有挑战性，因为使用粉末冶金或液体加工方法难以实现纳米尺寸增强材料在金属基材中的均匀分散。在本研究中，已经成功地通过摩擦搅拌工艺制备了由Al_2O_3颗粒增强的Al基纳米复合材料。研究并详细讨论了纳米Al_2O_3颗粒添加对搅拌摩擦加工的Al基体晶粒结构演变和力学行为的影响。结果表明，Al_2O_3颗粒的钉扎作用会延迟FSP期间再结晶后晶粒的生长，并导致晶粒尺寸的减小。通过添加Al_2O_3颗粒，在相同条件下相对于Al，显微硬度和抗拉强度显着提高。微观结构检查表明，在测试纳米复合材料的拉伸强度期间，由A1 / Al_2O_3界面引发的空隙。

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  • 来源
    《Materials Science and Engineering》 |2014年第25期|143-149|共7页
  • 作者

    J.F. Guo; J. Liu; C.N. Sun; S. Maleksaeedi; G. Bi; M.J. Tan; J. Wei;

  • 作者单位

    Singapore Institute of Manufacturing Technology (SIMTech) 71 Nanyang Drive, Singapore 638075, Singapore;

    Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore;

    Singapore Institute of Manufacturing Technology (SIMTech) 71 Nanyang Drive, Singapore 638075, Singapore;

    Singapore Institute of Manufacturing Technology (SIMTech) 71 Nanyang Drive, Singapore 638075, Singapore;

    Singapore Institute of Manufacturing Technology (SIMTech) 71 Nanyang Drive, Singapore 638075, Singapore;

    Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore;

    Singapore Institute of Manufacturing Technology (SIMTech) 71 Nanyang Drive, Singapore 638075, Singapore;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Friction stir processing; Nano-composites; Grain structure; Recrystallisation; Mechanical properties;

    机译：搅拌摩擦加工;纳米复合材料;晶粒结构重结晶;机械性能;

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