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In the present experimental research, the compo-casting process was employed to fabricate Zn-35Al-1.2Mg-0.2Sr composite alloy reinforced with nano-SiC(p) + micro-Gr(p) particles and the water-cooling control system casting was applied to realize the effects of different chilling conditions on the as-synthesized material. Also, dry sliding wear experiments were performed to study the wear behavior of Zn-35Al-1.2Mg-0.2Sr composite alloy. Moreover, the effects of nano-SiC(p) + micro-Gr(p) addition on wear behavior of the as-prepared composite at different wear temperatures were analyzed. It was noticed that the abrasive resistance of Zn-35Al-1.2Mg-0.2Sr composite alloy was dependent on the percentage and the dendritic arm spacing of the wearable Al-rich α-phase as well as on the distribution of nano-SiC(p) + micro-Gr(p) particles. With the increase in cooling rate during casting, the dendritic arm spacing of the α-phase decreased apparently. Further, with the increase in wear temperature, the percentage of the wearable Al-rich α-phase, especially for the specimen cooled under a full cooling mode, started to increase significantly. The specimen cooled under a full cooling mode manifested excellent high-temperature abrasive resistance. Furthermore, the tensile strength of the ascast composite increased with the increase in cooling rate during casting, and it could be attributed to the refined microstructures and the distribution of nano-SiC(p) + micro-Gr(p) particles. K e y w o r d s: Zn-35Al-1.2Mg-0.2Sr, SiC nanoparticles, Gr microparticles, wear behavior, compo-casting

kovové materiály

Relationship between microstructure and dry wear behavior of compo-cast nano-SiC(p) + micro-Gr(p)/Zn-35Al-1.2Mg-0.2Sr composite under different chilling conditions