Abdelatty Rokaya H, Radwan Ahmed Bahgat, Youssef Khaled, Ijaz Muhammad Farzik, Abdul Shakoor Rana
Center for Advanced Materials (CAM), Qatar University, Doha 2713, Qatar.
Materials Science and Technology Graduate Program, Department of Physics and Materials Science, Qatar University, Doha 2713, Qatar.
Materials (Basel). 2024 Jul 2;17(13):3258. doi: 10.3390/ma17133258.
In the present investigation, aluminum metal matrix composites (AMMs) reinforced with aluminum nitride (AlN) nanoparticulates at different volumetric ratios of (0, 0.5, 1, 1.5, and 2 vol.%) were manufactured via a microwave-assisted powder metallurgy technique. The morphological, physical, mechanical, and electrochemical properties of the produced billets were examined to reflect the impact of the successive addition of AlN into the aluminum (Al) matrix. The morphological analysis revealed the high crystalline patterns of the formation of the Al-AlN composites. The microstructural analysis confirmed the presence of the elemental constituents of Al and AlN particles in the fabricated composites, showing an enhanced degree of agglomeration in conjunction with the additional amount of AlN. Positive behavior exhibited by the micro- and nanohardness was noticeable in the Al-AlN composites, especially at the ultimate concentration of AlN in the Al matrix of a 2 vol.%, where it reached 669.4 ± 28.1 MPa and 659.1 ± 11 MPa compared to the pure Al metal at 441.2 ± 20 MPa and 437.5 ± 11 MPa, respectively. A declining trend in the compressive strength was recorded in the reinforced Al samples. The corrosion resistance of the AlN-reinforced Al metal matrix was estimated at 3.5 wt.% NaCl using electrochemical impedance spectroscopy and potentiodynamic polarization. The results reveal that the inclusion of 2.0 vol.%AlN led to the lowest corrosion rate.
在本研究中，通过微波辅助粉末冶金技术制备了不同体积比（0、0.5、1、1.5和2 vol.%）的氮化铝（AlN）纳米颗粒增强铝基金属基复合材料（AMM）。对制备的坯料的形态、物理、机械和电化学性能进行了检测，以反映在铝（Al）基体中连续添加AlN的影响。形态分析揭示了Al-AlN复合材料形成的高结晶模式。微观结构分析证实了在制备的复合材料中存在Al和AlN颗粒的元素成分，表明随着AlN添加量的增加，团聚程度增强。Al-AlN复合材料的显微硬度和纳米硬度表现出积极的行为，特别是在Al基体中AlN的最终浓度为2 vol.%时，与纯Al金属相比，其分别达到669.4±28.1 MPa和659.1±11 MPa，而纯Al金属分别为441.2±20 MPa和437.5±11 MPa。在增强的Al样品中记录到抗压强度呈下降趋势。使用电化学阻抗谱和动电位极化法在3.5 wt.%NaCl溶液中评估了AlN增强铝基金属基的耐腐蚀性。结果表明，加入2.0 vol.%的AlN导致最低的腐蚀速率。
