Electrochemical machining (ECM) is one of the important machining processes for machining alloys and composites. Aluminum metal matrix composites (AMMCs) are increasingly gaining in importance in the aerospace and automobiles industries. In this research the metal matrix composite (MMCs) is fabricated using the aluminum alloy (7075) with 5 % mass fraction of B4C and 10 % mass fraction of B4C in two different proportions as reinforcement. AMMCs (Al7075 with 5 % mass fraction of B4C and Al7075 with 10 % mass fraction of B4C) specimens were fabricated through a stir-casting process. The comparative study of the machinability of these composites is proposed using ECM. The input parameters like electrolyte temperature, electrolyte concentration, voltage and duty cycle were chosen and machining speed, overcut and delamination factor (DF) are considered as an output response. Sodium nitrate is used as an electrolyte and the electrolyte is heated by an induction heater to maintain the temperature during the machining, which was monitored continuously with a thermocouple. Based on conducted experiments the machining speed increases with the electrolyte temperature. The specimen of Al7075 with 10 % mass fraction of B4C composite shows a lower overcut and DF during the ECM process. Based on a Scanning Electron Microscope (SEM) image it is evident that the proper circular holes were obtained on the AMMC specimens (Al7075 with 5 % mass fraction of B4C and Al7075 with 10 % mass fraction of B4C). The EDAX analysis and Rockwell hardness test were performed to study the mechanical properties of the specimen. Keywords: electrochemical machining (ECM), electrolyte temperature, composite aluminum 7075, boron carbide (B 4 C), SEM, EDAX Elektrokemijska obdelava (ECM) je pomemben postopek mehanske obdelave kovinskih zlitin in kompozitov. Kompoziti z matrico na osnovi Al zlitin postajajo vedno pomembnej{i materiali v letalski in avtomobilski industriji. V~lanku avtorji opisujejo raziskavo obdelovalnosti (vrtanja izvrtin) kompozitov z matrico iz Al zlitine (Al7075) in dvema razli~nima vsebnostma B4C (5 mas. % in 10 mas. %) kot oja~itvene faze. Vzorci kompozitov so bili izdelani s postopkom preme{avanja in ulivanja (angl.: stir casting process). Avtorji prispevka so izdelali primerjalno {tudijo ECM obdelovalnosti obeh kompozitov. Za vhodne parametre so izbrali temperaturo elektrolita, njegovo koncentracijo, napetost in storilnost, medtem ko so bili odgovorjajo~i izhodni parametri hitrost obdelave, prekomerni odrez in delaminacijski faktor (DF). Za elektrolit so izbrali natrijev nitrat, ki so ga indukcijsko ogrevali na`eljeno temperaturo. Le-to so konstantno nadzirali s termo~lenom. Na osnovi preizkusov so ugotovili, da je hitrost mehanske obdelave (odvzema materiala med vrtanjem) nara{~ala z nara{~ajo~o temperaturo elektrolita. Vzorci kompozita z 10 mas.% B4C so imeli manj{i prekomerni odrez in DF po izvedenem ECM procesu. Na osnovi mikroposnetkov izdelanih z vrsti~nim elektronskim mikroskopom (SEM) so ugotovili, da so med obdelavo obeh k...
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.