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首页> 外文期刊>Journal of Materials Engineering and Performance >Microstructure and Tensile Properties of n-SiCp/Mg-9%Al Composites Prepared by Ultrasonic Assisted Hot Pressing of Powder
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Microstructure and Tensile Properties of n-SiCp/Mg-9%Al Composites Prepared by Ultrasonic Assisted Hot Pressing of Powder

机译：通过超声波辅助热压粉末制备的N-SICP / Mg-9％Al复合材料的微观结构和拉伸性能

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摘要

In this paper, the Mg-9%Al alloy reinforced by 5 wt.% SiC nanoparticles was fabricated by hot pressing of powder with ultrasonic vibration under a semi-solid state. The influence of hot-pressing temperature on the microstructure and mechanical properties of the n-SiCp/Mg-9%Al composite was investigated. The results indicated that the density of the composite was increased significantly and the agglomeration of SiC nanoparticles was evidently reduced with the increase in the hot-pressing temperature from 450 to 510 A degrees C. Additionally, the elevated hot-pressing temperature resulted in remarkable grain refinement. However, as the hot-pressing temperature increased to 530 A degrees C, the density decreased and the average grain size increased, which caused a decline in the mechanical properties. The study of the interface between the n-SiCp and the matrix in the nanocomposite suggested that n-SiCp bonded well with the matrix without interfacial activity. The ultimate tensile strength, yield strength and elongation to fracture of the nanocomposites were simultaneously enhanced compared with that of the Mg-9%Al alloy. This improvement could be attributed to obvious grain refinement and the Orowan strengthening mechanism.
机译：本文中，通过在半固态下通过具有超声振动的超声波振动来制造5重量％的Mg-9％Al合金。研究了热压温度对N-SiCP / Mg-9％Al复合材料的微观结构和力学性能的影响。结果表明，复合材料的密度显着增加，随着450至510℃的热压温度的增加，SiC纳米粒子的附聚显着减少了。另外，升高的热压温度导致了显着的晶粒细化。然而，随着热压温度增加到530℃，密度降低，平均晶粒尺寸增加，这导致机械性能下降。纳米复合材料中N-SICP与基质之间的界面的研究表明，N-SICP与基质粘合得很好，没有界面活性。与Mg-9％Al合金相比，同时增强了纳米复合材料的最终拉伸强度，屈服强度和延伸的伸长率。这种改进可能归因于明显的谷物细化和奥罗仑强化机制。

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