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首页> 外文期刊>Materials Science and Engineering >A comparison between hot-rolling process and twin-screw rheo-extrusion process for fabrication of aluminum matrix nanocomposite
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A comparison between hot-rolling process and twin-screw rheo-extrusion process for fabrication of aluminum matrix nanocomposite

机译：铝基纳米复合材料热轧工艺与双螺杆流变挤出工艺的比较

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Solid-state modification of SiC nanoparticles in a ball-mill is a known method for deagglomeration of as-received nanoparticles in a bed of metallic carriers that will also aid their better injection and releasing into the melt. The melt temperature and condition of the melt is very important for a better interaction of composite powders including ceramic nanoparticles and metallic carrier with the melt. In this study, aluminum A356 matrix nanocomposites were produced by liquid-state stir casting at 715 degrees C followed by twin-screw rheo-extrusion (TSRE) in the semi-solid state to enhance the produced composite properties. For this purpose, SiC nanocomposite superstructures were prepared using ball-milling of SiC nanopowders with micron-sized titanium and nickel (separately) as carrier agents. Also, hot-rolling (HR) process was applied on liquid-state stir cast nanocomposites to compare the mechanical properties of rolled sheets with TSRE-processed bars. The experimental results indicated that stir-cast samples before TSRE and HR consisted various types of defects with poor dispersion of nanoparticles in some areas. However, more improved dispersions for the nanoparticles were obtained after TSRE and HR and rolled sheets had considerable improved mechanical properties compared with TSRE bars. This latter improvement was determined to be mainly due to extensive fragmentation and dispersion of eutectic silicon, Ti-rich, and Ni-rich intermetallic phases.
机译：在球磨机中对SiC纳米颗粒进行固态改性是一种用于将原样的纳米颗粒在金属载体床中解聚的已知方法，这也将有助于它们更好地注入并释放到熔体中。熔体的熔体温度和条件对于使包括陶瓷纳米颗粒和金属载体的复合粉末与熔体更好地相互作用至关重要。在这项研究中，铝A356基质纳米复合材料是通过在715摄氏度下进行液态搅拌铸造，然后以半固态进行双螺杆流变挤出（TSRE）来生产的，从而提高了生产的复合材料的性能。为此，使用球磨SiC纳米粉，并用微米尺寸的钛和镍（分别）作为载体，制备SiC纳米复合材料超结构。此外，热轧（HR）工艺应用于液态搅拌铸造纳米复合材料，以比较轧制板与TSRE处理棒材的机械性能。实验结果表明，在TSRE和HR之前的搅拌铸造样品包含各种类型的缺陷，并且在某些区域中纳米颗粒的分散性较差。但是，在TSRE和HR之后，纳米颗粒的分散体得到了进一步改善，与TSRE棒材相比，轧制板具有显着改善的机械性能。确定后一种改进主要是由于共晶硅，富钛和富镍金属间相的广泛破碎和分散。

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