{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,20]],"date-time":"2026-01-20T09:03:43Z","timestamp":1768899823881,"version":"3.49.0"},"reference-count":58,"publisher":"MDPI AG","issue":"1","license":[{"start":{"date-parts":[[2019,12,18]],"date-time":"2019-12-18T00:00:00Z","timestamp":1576627200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001871","name":"Funda\u00e7\u00e3o para a Ci\u00eancia e a Tecnologia","doi-asserted-by":"publisher","award":["PD\/BD\/143030\/2018"],"award-info":[{"award-number":["PD\/BD\/143030\/2018"]}],"id":[{"id":"10.13039\/501100001871","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001871","name":"Funda\u00e7\u00e3o para a Ci\u00eancia e a Tecnologia","doi-asserted-by":"publisher","award":["UID\/EMS\/00285\/2019"],"award-info":[{"award-number":["UID\/EMS\/00285\/2019"]}],"id":[{"id":"10.13039\/501100001871","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Metals"],"abstract":"<jats:p>This research focuses on the characterization of a metal matrix nanocomposite (MMNC) comprised of a nickel matrix reinforced by carbon nanotubes (CNTs). The aim of this study was to characterize Ni\u2013CNTs nanocomposites produced by powder metallurgy using ball-milling. CNTs were initially untangled using ultrasonication followed by mixture\/dispersion with Ni powder by ball-milling for 60, 180, or 300 min. The mixtures were cold-pressed and then pressureless sintered at 950 \u00b0C for 120 min under vacuum. Their microstructural characterization was mainly performed by optical microscopy (OM), scanning electron microscopy (SEM), and electron backscatter diffraction (EBSD). The mechanical properties were evaluated by Vickers microhardness. The results indicate that combining ultrasonication and ball-milling can successfully produce Ni\u2013CNTs nanocomposites. The ball-milling time has a significant effect on both the CNT dispersion and the final nanocomposite microstructure.<\/jats:p>","DOI":"10.3390\/met10010002","type":"journal-article","created":{"date-parts":[[2019,12,20]],"date-time":"2019-12-20T09:50:33Z","timestamp":1576835433000},"page":"2","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":15,"title":["Characterization of Ni\u2013CNTs Nanocomposites Produced by Ball-Milling"],"prefix":"10.3390","volume":"10","author":[{"given":"\u00cdris","family":"Carneiro","sequence":"first","affiliation":[{"name":"CEMMPRE, Department of Metallurgical and Materials Engineering, University of Porto, R. Dr Roberto Frias, 4200-465 Porto, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2894-771X","authenticated-orcid":false,"given":"Filomena","family":"Viana","sequence":"additional","affiliation":[{"name":"CEMMPRE, Department of Metallurgical and Materials Engineering, University of Porto, R. Dr Roberto Frias, 4200-465 Porto, Portugal"},{"name":"INEGI-Institute of Science and Innovation in Mechanical and Industrial Engineering, R. Dr Roberto Frias, 4200-465 Porto, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3667-0562","authenticated-orcid":false,"given":"Manuel F.","family":"Vieira","sequence":"additional","affiliation":[{"name":"CEMMPRE, Department of Metallurgical and Materials Engineering, University of Porto, R. Dr Roberto Frias, 4200-465 Porto, Portugal"},{"name":"INEGI-Institute of Science and Innovation in Mechanical and Industrial Engineering, R. Dr Roberto Frias, 4200-465 Porto, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3692-585X","authenticated-orcid":false,"given":"Jos\u00e9","family":"Valdemar Fernandes","sequence":"additional","affiliation":[{"name":"CEMMPRE, Department of Mechanical Engineering, University of Coimbra, Rua Lu\u00eds Reis Santos, Pinhal de Marrocos, 3030-788 Coimbra, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4670-4516","authenticated-orcid":false,"given":"S\u00f3nia","family":"Sim\u00f5es","sequence":"additional","affiliation":[{"name":"CEMMPRE, Department of Metallurgical and Materials Engineering, University of Porto, R. Dr Roberto Frias, 4200-465 Porto, Portugal"},{"name":"INEGI-Institute of Science and Innovation in Mechanical and Industrial Engineering, R. 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