Microstructure and mechanical properties of doped and electron-beam treated surface of hypereutectic Al-11.1%Si alloy

Publication date: Available online 16 August 2019Source: Journal of Materials Research and TechnologyAuthor(s): Dmitrii Zaguliaev, Sergey Konovalov, Yurii Ivanov, Victor Gromov, Elizaveta PetrikovaAbstractThe effect of electroexplosive doping in two modes with subsequent intense pulsed electron beam treatment of hypereutectic Al-11.1%Si alloy (silumin) on the change of its structure and phase composition, mechanical and tribological properties has been investigated. Methods of methods of scanning electron microscopy, electron microprobe and X-ray diffraction analysis were used to analyze changes of the structure, phase composition, and morphology of the modified surface of hypoeutectic silumin subjected to a complex treatment. Change of tribological and mechanical properties after the complex energy deposition is evaluated: the microhardness increases by 3.2 times (2.34 GPa in contrast to 0.73 GPa in the as-cast state), the wear parameter (inverse to the wear resistance) decreases by 18–20 times (from 49⋅10−4 mm3/N⋅m to 2.5⋅10−4 mm3/N⋅m) and the friction coefficient decreases by ≈1.5 times (from 0.55 to 0.36). It is revealed that a complex treatment mode hardly affects the studied properties but it has a strong effect on the phase composition of a modified layer (the content of the aluminum-based solid solution is reduced by 2.5 times, and the relative content of silicon oxide grows by ≈2.2 times). The multiphase submicro- and nanocrystal...
Source: Journal of Materials Research and Technology - Category: Materials Science Source Type: research