An　Al-Ni-Mm-Fe　amorphous　and　nanocrystalline　composite　coating　was　prepared　onto　the　surface　of　AZ91　magnesium　alloy　by　high　velocity　arc　spraying　process.　And　the　microstructure　of　the　coating　was　analyzed　by　scanning　electron　microscope　(TEM)　and　X-ray　diffraction　(XRD).　The　analysis　results　indicated　that　the　coating　consists　of　amorphous,　nanocrystalline　and　crystalline　phases.　It　has　a　dense　structure　with　a　low　porosity　of　about　2.0　%.　Its　average　micro　Vickers　hardness　value　is　about　330　HV0.1,　which　is　five　times　than　that　of　AZ91　magnesium　alloy　(62　HV0.1)　and　four　times　than　that　of　pure　Al　coating　(71　HV0.1).　The　abrasion　tests　showed　that　the　Al-Ni-Mm-Fe　coating　exhibits　a　good　abrasion　resistance.　(C)　2013　The　Authors.　Published　by　Elsevier　B.V.　Open　access　under　CC　BY-NC-ND　license.