Impact of Nano Magnesium AZ61, AZ91 Alloy on Corrosion, Mechanical, and Microstructural Properties under the Process of Laboratory Ball Milling

Abstract

The low density and excellent mechanical qualities of magnesium and its alloys, which are widely used, are examined in this paper's investigation of their microstructural, mechanical, and corrosion properties. Most applications for magnesium and its alloys are in the automotive, biomedical, and aerospace industries. The method of using powder metallurgy to increase the efficacy of magnesium was looked into, where the mixed powder is blended and carried out by uni-axial die compaction followed by sintering. This study examines the impact of cold compaction on magnesium alloys AZ61 and AZ91 utilizing ultra-fine-grained (UFG) powder with a particle size of 60 nm that was produced during an 8-hour mechanical ball milling process at room temperature.The coarse nanocrystalline powder is allowed to compact in a die at 40 MPa pressure for 5 minutes, producing a densely packed platelet. 8 hours of sintering were implemented in a tubular vacuum heater at 425⁰C, 450⁰C, and 475⁰C. Results reveal that the grain boundaries of the magnesium AZ61 and AZ91 alloy during cold compaction and sintering are less porous. It was possible to achieve a mechanical hardness of 543Mpa and compressive strength of 173Mpa, both of which were significantly enhanced by increasing sintering temperatures of 475⁰C. At 475⁰C temperatures, the lowest corrosion resistance value of 0.27 mm. y^-1 was achieved