1401 KB24 KB200020242014Chandramohan, GovindarajuluPrabagaran, SubramaniamShanmughasundaram, Palanisamyletnik:48številka:5str. 661-667COBISSID:1083818ISSN:1580-2949URN:URN:NBN:SI:doc-NNKUQ5Y0enInštitut za kovinske materiale in tehnologijeMateriali in tehnologijeboron carbideborov karbiddrsenjegrafitgraphiteobrabaodpornostpin-on-discslidingwear resistanceInfluence of graphite on the hardness and wear behavior of AA6061-B4C composite| Vpliv grafita na trdoto in vedenje kompozita AA6061-B4C pri obrabi|Dry-sliding-wear behavior of AA6061, AA6061-B4C composite and AA6061-B4C-Gr hybrid composite was investigated by employing a pin-on-disc wear-test rig. Hardness tests were also carried out. Graphite was used as a solid lubricant since it is a soft, slippery and greyish-black substance. Because of the cleavage (crystal) loose interlamellar coupling, graphite has good lubricating properties. A comparative analysis was made on the hardness and wear behavior of AA6061, AA6061-B4C composite and AA6061-B4C-Gr hybrid composite. Boron carbide is known as a robust material having a high hardness. Worn-out surfaces of the wear specimens after the wear tests were examined with a scanning electron microscope to study the morphology of the worn surfaces. Energy dispersive spectroscopy (EDS) was employed to identify the oxides formed on the worn surfaces of the AA6061-B4C and AA6061-B4C-Gr composites after the wear test. It was found that a mutual transfer of the material between the wearing Al-alloy and the steel counterface occurred as the load increased. Oxidative wear occurred at low applied loads and a high velocity, whereas delamination and adhesive wear occurred at a high load and high sliding velocityPreiskovano je bilo vedenje AA6061, AA6061-B4C-kompozita in hibridnega kompozita AA6061-B4C-Gr pri suhem drsenju z uporabo naprave "pin on disc". Kot trdno mazivo je bil uporabljen grafit, ki je mehka, spolzka in sivo-črna snov. Zaradi cepljive šibke medlamelarne povezave (v kristalu) ima grafit dobre mazalne lastnosti. Izvršene so bile analize primerjave trdote in vedenja pri obrabi AA6061, AA6061-B4C-kompozita in hibridnega kompozita AA6061-B4C-Gr. Borov karbid je poznan kot zdržljiv material z veliko trdoto. Po preizkusu obrabe je bila z elektronskim vrstičnim mikroskopom izvršena preiskava morfologije obrabljene površine vzorcev, da bi ugotovili nastale okside na obrabljeni površini kompozitov AA6061-B4C in AA6061-B4C-Gr. Ugotovljeno je bilo, da se pri naraščanju obremenitve pojavi vzajemen prenos materiala med Al-zlitino, ki se obrablja, in jeklom. Oksidativna obraba se je pojavila pri majhnih obremenitvah in velikih hitrostih, medtem ko se je obraba zaradi delaminacije in adhezije pojavila pri velikih obremenitvah in veliki hitrosti drsenjaTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaInštitut za kovinske materiale in tehnologije