Adding　heterogeneous　nucleation　refiners　is　an　effective　route　to　obtain　fine　grained　microstructure.　To　investigate　effect　of　silicon　carbide　(SiC)　particles　on　mechanical　properties　of　Al-Mg　alloy,　metallic　matrix　composites　(MMCs)　were　fabricated　by　an　innovative　powder　and　wire　cold　metal　transfer　(CMT)　process　with　enhanced　mechanical　properties.　Microstructure　evolution,　grain　orientation　and　mechanical　properties　of　CMT　processed　MMCs　reinforced　by　SiC　particles　at　different　concentrations　were　discussed.　The　mechanical　properties　of　Al-Mg　alloy　reached　the　highest　tensile　strength　of　325.6　+/-　16　MPa　by　addition　of　SiC　particles　with　a　volume　fraction　of　8%　and　an　average　grain　diameter　of　49.1　mm.　This　research　provided　a　novel,　time-saving,　low-cost　approach　to　fabricate　Al-Mg　composites　and　expands　application　of　Al-Mg　alloy.　(c)　2022　The　Authors.　Published　by　Elsevier　B.V.　This　is　an　open　access　article　under　the　CC　BY-NC-ND　license　(http://creativecommons.org/licenses/by-nc-nd/4.0/).