Unstable stacking faults in submicron/micron Al grammins in multi-SiCp/multi-Al nanocomposite

作者：Yang Wenshu^*; Dong Ronghua; Jiang Longtao; Wu Gaohui; Hussain Murid

来源：Vacuum, 2015, 122: 1-5.

DOI：10.1016/j.vacuum.2015.09.002

• Metal-matrix composites (MMCs)
• Nano-structures
• Microstructures
• Liquid metal infiltration

It is difficult to obtain planar defects in aluminum due to its high stacking fault energy, in particular in submicron/micron Al grains. In this work we provide evidence for planar defects in submicron/micron Al grain of composites with multi nano-particles by transmission electron microscope observations. Nano-SiC particles (<100 nm) were found within micron-Al grains (>2 mu m), while submicron SiC particles (200-500 nm) were present at the boundary of ultrafine Al grains (100-500 nm). Zigzag defects and linear defects were observed in both the micron-Al grains and ultrafine Al grains. These defects are made up of distortion areas, edge dislocations, stacking faults which contain Frank partial dislocations and twinning. Therefore, these defects are in a state of extreme instability, which would "disappear" under the electron beam irradiation in a few seconds. These results highlight that the increase of interface could lead to the formation of stacking faults, even in the micron Al grains.

• 出版日期2015-12
• 单位哈尔滨工业大学