Studying the possibility of hypereutectic silumin surface layer structure and properties modification by intense pulsed electron beam

Metallurgy and Material Science

Material science


Аuthors

Rygina M. E.*, Petrikova E. A.**, Teresov A. D.***, Ivanov Y. F.****

Institute of High Current Electronics, Siberian Branch, Russian Academy of Sciences, IHCE SB RAS, 2/3, Akademichesky av., Tomsk, 634055, Russia

*e-mail: l-7755me@mail.ru
**e-mail: petrikova@opee.hcei.tsc.ru
***e-mail: tad514@yandex.ru
****e-mail: yufi55@mail.ru

Abstract

Silumins of the hypereutectic composition in the cast state are characterized by a high level of porosity, the presence of large silicon inclusions and intermetallides, which significantly reduces the range of this material application in industry. To eliminate these drawbacks, samples of hypereutectic silumin (Al- (20-22) wt% Si) were irradiated in vacuum with an intense pulsed electron beam in the surface layer melting mode. Irradiation of the surface of the silumin samples was performed by an intense pulsed electron beam (“SOLO” facility, HCEI SB RAS). The irradiation was performed in a residual argon atmosphere at a pressure of 0.02 Pa with the following parameters: 18 keV; 40 J/cm2; 200 µs; 0.3 c-1; 20 pulses. The selected mode, as shown by the results of modeling the temperature field formed in the surface layer of silumin, results in the surface layer melting of the material up to 70 μm thickness. Investigations of the elemental and phase composition, the state of silumin defective substructure in the initial state, and after irradiation with an intense pulsed electron beam were performed using scanning electron microscopy (SEM-515 Philips) and transmission electron microscopy (JEM 2100F), X-ray diffraction (XRD 6000, imaging copper-filtered radiation of Cu-K 1, monochromator CM-3121). The samples microhardness was being determined with the PMT-3 device with an indentor load of 0.1 N. The wear-out parameter and friction coefficient were being identified on a TRIBOtechnic tribometer. The results of the studies performed revealed that the high-speed melting and subsequent high-speed crystallization were led to a nonporous surface layer forming of up to 100 μm thickness with the structure of cellular crystallization free of primary inclusions of silicon and intermetallides.

The size of the cells of high-speed crystallization formed by a solid solution based on aluminum was 0.4-0.6 μm. The cells were separated by interlayers enriched with silicon, copper, nickel and iron atoms. The transverse size of the interlayers was up to 100 nm. It was revealed that the nonporous surface layer formation with a multiphase submicro- nanocrystal structure was accompanied by an increase in the silumin microhardness by 4.5 times, and wear resistance by 1.2 times compared to the cast state.

Keywords:

hypereutectic silumin, intensive pulsed electron beam, phase composition, structure, hardness, wear resistance

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