Dispersion of silicon carbide nanoparticles in a AA2024 aluminum alloy by a high-energy ball mill

作者：Carreno Gallardo C; Estrada Guel I; Lopez Melendez C; Martinez Sanchez R^*

来源：Journal of Alloys and Compounds, 2014, 586: S68-S72.

DOI：10.1016/j.jallcom.2013.03.232

• Aluminum alloy
• SiC
• Mechanical alloying
• Composites

Al-2024 alloy was reinforced with silicon carbide nanoparticles (SiCNP), whose concentration was varied in the range from 0 to 5 wt.%; some composites were synthesized with the mechanical milling (MM) process. Structure and microstructure of the consolidated samples were studied by X-ray diffraction and transmission electron microscopy, while mechanical properties were investigated by compressive tests and hardness measurements. The microstructural evidence shows that SiCNP were homogeneously dispersed into the Al-2024 alloy using high-energy MM after 2 h of processing. On the other hand, an increase of the mechanical properties (yield stress, maximum strength and hardness) was observed in the synthesized composites as a direct function of the SiCNP content. In this research several strengthening mechanisms were observed, but the main was the obstruction of dislocations movement by the addition of SiCNP.

• 出版日期2014-2-15