Fabrication of High Strength Al Nanocomposites with Populous TiB2 Nanoparticles
Fabrication of High Strength Al Nanocomposites with Populous TiB2 Nanoparticles
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DOI：
10.1016/j.promfg.2018.07.073
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
A. Javadi;S. Pan;Xiaochun Li
中科院分区：
文献类型：
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作者：
A. Javadi;S. Pan;Xiaochun Li
高性能轻质金属为许多应用提供了提高能效和系统性能的巨大潜力。传统的制造工艺，如热机械加工和变形，在进一步改善金属性能方面已经达到了极限。因此，需要一种新的方法来开发高性能的轻金属，可以提供有前途的性能。金属基纳米复合材料（MMNC）是生产轻质金属的一种出色方法，具有传统制造无法实现的改进性能。将合适的纳米颗粒系统有效地结合到金属基质如铝（Al）中可以改善基质的性能。然而，由于铝与纳米颗粒的高化学反应性和差的润湿性，实现高体积分数的纳米颗粒掺入是一个很大的挑战。在这里，我们展示了一种新的方法，将高体积分数的二硼化钛（TiB 2）纳米粒子在铝基体。Al-TiB 2纳米复合微粒最初是通过助熔剂辅助凝固工艺制备的。采用冷压-熔融法制备了Al-TiB 2纳米复合材料。扫描电子显微镜（SEM）图像显示，TiB 2纳米颗粒在Al基体中分散不牢固。成功制备了维氏硬度高达485.9±16.9的Al-TiB 2纳米复合材料。此外，还研究了熔化时间对Al-TiB 2纳米复合材料硬度的影响。
High performance lightweight metals offer tremendous potential to improve energy efficiency and system performance for numerous applications. Traditional manufacturing processes such as thermomechanical processing and deformation have reached their limits in further improving the properties of metals. Thus, a new approach is necessary to develop high performance lightweight metals which can offer promising properties. Metal matrix nanocomposite (MMNC) is an excellent approach to produce lightweight metals with improved properties that cannot be achieved by traditional manufacturing. Effective incorporation of a suitable nanoparticles system in a metallic matrix such as aluminum (Al) can improve the performance of the matrix. However, due to the high chemical reactivity and poor wettability of Al with nanoparticles, achieving high volume fraction of nanoparticles incorporation is of a great challenge. Here we show a novel approach to incorporate high volume fraction of titanium diboride (TiB2) nanoparticles in Al matrix. Al-TiB2nanocomposite microparticles were initially produced via flux assisted solidification processes. Al-TiB2nanocomposites were produced by cold compaction followed by melting. Scanning electron microscopic (SEM) images revealed that the TiB2nanoparticles are unfirmly dispersed and distributed in Al matrix. Al-TiB2nanocomposites with as high as 485.9±16.9 Vickers hardness were successfully produced. Furthermore, the effect of melting time was studied on the hardness of the Al-TiB2nanocomposites.