Microstructure and mechanical characterization of (B4C+ h-BN)/Al hybrid nanocomposites processed by ultrasound assisted casting
Microstructure and mechanical characterization of (B4C+ h-BN)/Al hybrid nanocomposites processed by ultrasound assisted casting
复制标题
DOI：
10.1016/j.ijmecsci.2017.08.039
复制
发表时间：
2018-08-01
影响因子：
7.3
通讯作者：
Selvakumar, N.
中科院分区：
文献类型：
--
作者：
Harichandran, R.;Selvakumar, N.
六方氮化硼纳米颗粒（h-BN）具有良好的自润滑性能、热稳定性和化学稳定性，因此，作为铝合金增强体的研究越来越受到人们的关注。铝纳米复合材料含有不同的重量%，采用搅拌和超声辅助铸造法制备了B4 C纳米颗粒和Al-B4 C-h-BN杂化纳米复合材料。所制备的混合物和纳米复合材料，其特征在于使用X射线衍射，原子力显微镜，扫描电子显微镜和能量色散X射线分析。采用拉伸、冲击和显微硬度测试评价了硼基纳米颗粒分散混合物和纳米复合材料的机械性能。显微组织研究表明，复合材料中的颗粒分布均匀，晶粒细化，孔隙率低。拉伸试验结果表明，有一个显着的改善，在拉伸强度（67%）的混合纳米复合材料相比，基础铝基体。所述纳米复合材料包含6重量%的的B4 C纳米颗粒显示出最大值的拉伸强度和硬度相比，所有其他组合的增强。B4 C（2重量%）的混合组合和4 wt.%）和h-BN（2重量%）与纳米复合材料相比，纳米颗粒增强的铝混杂纳米复合材料显示出冲击能量和伸长率的改善。含4wt%B4C和2wt% B4 C的混杂纳米复合材料的磨损性能h-BN与未增强的铝基体和纳米复合材料相比表现出上级耐磨性能。(C)2017爱思唯尔有限公司版权所有。
The interest in use of hexagonal boron nitride nanoparticles (h-BN) as reinforcement for aluminium has been growing considerably due to its self-lubricating property, thermal and chemical stability. The aluminium nanocomposites containing different wt.% of B4C nanoparticles and Al-B4C-h-BN hybrid nanocomposites are prepared using stir and ultrasound assisted casting method. The prepared hybrid and nanocomposites are characterized using X-ray diffraction, Atomic Force Microscopy, Scanning Electron Microscopy and Energy Dispersive X-ray Analysis. The mechanical properties of boron based nanoparticles dispersed hybrid and nanocomposites are evaluated using tensile, impact, and microhardness testing. The results of microstructural study reveal uniform distribution, grain refinement and low porosity in the composite specimens. The tensile test results show that there is a significant improvement in tensile strength (67%) of the hybrid nanocomposites compared to the base aluminium matrix. The nanocomposite containing 6 wt.% of B4C nanoparticles shows the maximum values of tensile strength and hardness compared to all other combinations of reinforcements. Hybrid combination of B4C (2 wt.% and 4 wt.%) and h-BN (2 wt.%) nanoparticles reinforced aluminium hybrid nanocomposites shows improvement in impact energy and elongation compared to the nanocomposites. The wear properties of the hybrid nanocomposites, containing 4 wt% B4C and 2 wt.% h-BN, exhibit the superior wear resistance properties compared to the unreinforced aluminium matrix and nanocomposites. (C) 2017 Elsevier Ltd. All rights reserved.