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Influence of nanostructured Al on the mechanical properties and sliding wear behavior of Al-MWCNT composites

机译：纳米结构Al对Al-MWCNT复合材料的力学性能和滑动磨损行为的影响

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In the present investigation, aluminum-based nanocomposites using multiwalled carbon nanotubes (Al-MWCNTs) were developed using nanostructured Al as a matrix and MWCNTs as nanofillers through a powder metallurgy route. The effect of nanostructured Al on the microstructure, microhardness, and sliding wear behavior of Al-MWCNT composites was studied. The crystallite size of nanostructured Al via mechanical milling for 25 h was found to be 32 nm. The major challenge associated with the development of Al-MWCNT nanocomposites is the uniform dispersion of the CNTs in the Al matrix, which was addressed by incorporating nanostructured Al. A significant improvement in the relative density, microhardness, and wear resistance of the Al-MWCNT composites up to the addition of 2 wt% of the MWCNTs was observed compared with as-received Al and its composites. The hardness of an Al-2 wt% MWCNT composite developed using nanostructured Al was 800 MPa, which was five times higher than as-received Al (170 MPa). Hardness and wear resistance found to be inversely proportional to crystallite size and porosity. The significant incremental improvement in the mechanical and wear properties mainly originates from fine-grain strengthening effects and the homogenous distribution of MWCNTs in the Al matrix. The presence of well-dispersed CNTs while maintaining structural integrity and aluminum carbide (Al_4C_3) crystals in the Al matrix were observed. The wear mechanism of Al-MWCNT nanocomposites was studied in detail. The wear mechanism of nanostructured Al composites has not been discussed in the literature previously; thus, this is the first comparative study of micro-and nanostructured Al-based composites.
机译：在本研究中，使用纳米结构Al作为基质和MWCNTS作为纳米填充物，通过粉末冶金途径开发使用多晶碳纳米管（Al-MWCNT）的铝基纳米复合材料。研究了纳米结构A1对Al-MWCNT复合材料的微观结构，显微硬度和滑动磨损行为的影响。通过机械研磨25小时，纳米结构Al的微晶尺寸为32nm。与Al-MWCNT纳米复合材料的发育相关的主要挑战是通过掺入纳米结构的Al基质中CNT的均匀分散。与接收的Al及其复合材料相比，观察到Al-MWCNT复合材料的相对密度，显微硬度和耐磨性的显着改善，从而达到2wt％的MWCNT。使用纳米结构Al开发的Al-2wt％MWCNT复合物的硬度为800MPa，其比接待Al（170MPa）高五倍。发现硬度和耐磨性与微晶尺寸和孔隙率成反比。机械和磨损性能的显着增量改善主要来自微粒强化效应和Al基质中MWCNT的均匀分布。观察到在保持Al基质中保持结构完整性和碳化铝（Al_4C_3）晶体的同时存在良好分散的CNT。详细研究了Al-MWCNT纳米复合材料的磨损机理。纳米结构的Al复合材料的磨损机理尚未在文献中讨论;因此，这是微型和纳米结构的铝复合材料的第一对比较研究。

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