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2020, vol. 48, br. 3, str. 532-542
Istraživanje mikrostrukture, mehaničkih svojstava i obradljivosti hibridnog nanokompozita na bazi Al7075/SiC/h i BN proizvedenog livenjem istiskivanjem uz pomoć ultrazvuka
Vellore Institute of Technology, School of Mechanical Engineering, Vellore, India

e-adresabenedict.thomas@vit.ac.in
Ključne reči: hybrid nanocomposite; ultrasonic-assisted squeeze casting; mechanical properties; machinability; roughness
Sažetak
Rad se bavi istraživanjem mikrostrukture, mehaničkih svojstava i obradljivosti hibridnog nanokompozita od Al7075 i Al7075/SiC/h-BN dobijenog livenjem istiskivanjem. Legura nanokompozita Al7075 je ojačana česticama SiC (1 wt%) mikrodimenzija i nanočesticama h-BN (0,5 wt %) koje su pripremljene mešanjem rastopine uz pomoć ultrazvuka. Da bi se postiglo bolje mešanje ojačanja, smanjio efekat aglomeracije nanočestica i bolja kvašljivost u rastopini, SiC i h-BN u praškastom stanju su podvrgnuti obradi kuglicama u trajanju od 4 časa. Istraživanje mikrostrukture pripremljenog nanokompozita je obavljeno korišćenjem OM, SEM i analizom mapiranja rendgen zraka. Mapiranje i OM metoda pokazuju dobru distribuciju ojačanja i prečišćenost dimenzija čestica. Istraživanje mehaničkih svojstava pokazuje značajno poboljšanje (35,33%; 21,69%; 13,87%; 12,27%) vrednosti napona razvlačenja, zatezne čvrstoće, tvrdoće po Rokvelu, odnosno mikrotvrdoće (Vikers). Analiza obradljivosti je obavljena da bi se ispitao uticaj nekoliko parametara obrade kao što je brzina rezanja, brzina pomoćnog kretanja i dubina rezanja na hrapavoj površini, silu rezanja i dužinu strugotine u uslovima suvog i minimalnog podmazivanja pri obradi. Rezultati analize obradljivosti su upoređeni sa uzorkom Al7075 i potom razmotreni.
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