Sun Kai, Zhu Ping, Zhang Pinliang, Zhang Qiang, Shao Puzhen, Wang Zhijun, Yang Wenshu, Zhao Dashuai, Balog Martin, Krizik Peter, Wu Gaohui
Departmentof Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China.
Key Laboratory of Advanced Structure-Function Integrated Materials and Green Manufacturing Technology, Harbin Institute of Technology, Harbin 150001, China.
Nanomaterials (Basel). 2022 Jun 30;12(13):2258. doi: 10.3390/nano12132258.
Nanomaterials play an important role in metal matrix composites (MMC). In this study, 3.0 wt.%, 6.0 wt.%, and 9.0 wt.% nano-AlN-particles-reinforced AA6061 (nano-AlN/AA6061) composites were successfully prepared by pressure infiltration technique and then hot extruded (HE) at 500 °C. The microstructural characterization of the composites after HE show that the grain structure of the Al matrix is significantly refined, varying from 2 to 20 μm down to 1 to 3 μm. Nano-AlN particles in the composites are agglomerated around the matrix, and the distribution of nano-AlN is improved after HE. The interface between AA6061 and nano-AlN is clean and smooth, without interface reaction products. The 3.0 wt.% nano-AlN/AA6061 composite shows an uppermost yield and supreme tensile strength of 333 MPa and 445 MPa, respectively. The results show that the deformation procedure of the composite is beneficial to the further dispersion of nano-AlN particles and improves the strength of nano-AlN/AA6061 composite. At the same time, the strengthening mechanism active in the composites was discussed.
纳米材料在金属基复合材料（MMC）中发挥着重要作用。在本研究中，通过压力浸渗技术成功制备了3.0 wt.%、6.0 wt.%和9.0 wt.%纳米AlN颗粒增强的AA6061（纳米AlN/AA6061）复合材料，然后在500℃下进行热挤压（HE）。热挤压后复合材料的微观结构表征表明，Al基体的晶粒结构显著细化，从2至20μm减小至1至3μm。复合材料中的纳米AlN颗粒在基体周围团聚，热挤压后纳米AlN的分布得到改善。AA6061与纳米AlN之间的界面干净且光滑，没有界面反应产物。3.0 wt.%纳米AlN/AA6061复合材料的屈服强度和抗拉强度最高，分别为333MPa和445MPa。结果表明，复合材料的变形过程有利于纳米AlN颗粒的进一步分散，并提高了纳米AlN/AA6061复合材料的强度。同时，对复合材料中起作用的强化机制进行了讨论。
