Abstract
The paper analyzes research data on the structure and properties of surface layers of commercially pure A7-grade aluminum subjected to treatment that combines deposition of a thin metal film, intense pulsed electron beam irradiation, and nitriding in low-pressure arc plasma. The analysis shows that the combined method of surface modification provides the formation of a multilayer structure with submicro- and nano-sized phases in the material through a depth of up to 40 μm, allowing a manifold increase in its surface microhardness and wear resistance (up to 4 and 9 times, respectively) compared to the material core. The main factors responsible for the high surface strength are the saturation of the aluminum lattice with nitrogen atoms and the formation of nano-sized particles of aluminum nitride and iron aluminides.
Highlights
The low hardness and the low wear resistance of aluminum limit the application of the material and its alloys in industry [1]
Our study shows that when nitrided, the Al surface layer assumes an island structure (Fig. 1, a)
The second phase is Al with a Electron diffraction analysis of thin foils shows that the AlN islands have a columnar structure with lateral sizes of columns of 0.4–0.5 m (Fig. 2, a)
Summary
The low hardness and the low wear resistance of aluminum limit the application of the material and its alloys in industry [1]. We analyze the structure and properties of commercially pure aluminum subjected to treatment that combines deposition of a thin metal film, intense pulsed electron beam irradiation, and nitriding in low-pressure arc plasma.
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