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利用球磨预分散-搅拌铸造法制备纳米Al2O3/2024复合材料,并对所制备的铝基复合材料进行了显微组织及力学性能的研究。结果表明,经球磨预分散后,纳米颗粒团聚现象明显消除,纳米Al2O3呈单颗粒分散于Al粉表面;复合粉体添加法有效避免了超细增强颗粒和基体润湿性差和分散性较差的问题,实现纳米Al2O3颗粒均匀弥散分布于基体合金中;纳米Al2O3颗粒的加入显著提高基体合金的力学性能。与传统搅拌铸造相比,所制备的Al2O3/2024复合材料的抗拉强度、屈服强度和显微硬度分别提高了58%、59%和16%。
The nano-Al2O3 / 2024 composite was prepared by ball-milling pre-dispersion-stirring casting method, and the microstructure and mechanical properties of the prepared aluminum matrix composites were studied. The results showed that the aggregation of nanoparticles was obviously eliminated after pre-dispersion by ball milling, and nano-Al2O3 was dispersed as a single particle on the surface of Al powder. The composite powder addition method effectively avoided the poor wettability and poor dispersibility of ultrafine particles and matrix Issue, to achieve uniform dispersion of nano-Al2O3 particles distributed in the matrix alloy; nano-Al2O3 particles added significantly improve the mechanical properties of the matrix alloy. The tensile strength, yield strength and microhardness of Al 2 O 3/2024 composites were increased by 58%, 59% and 16%, respectively, compared with those of conventional stirred casting.