Microstructural and Mechanical Behaviourial Properties of Cold Compacted Ultra-Fined Grained (UFG) Magnesium AZ31B Alloy Prepared by Ball Milling Process

Abstract

The Magnesium and its alloys are majorly utilized in automotive, aerospace, and biomedical applications because of their extensive properties. The approach for the preparation of the Magnesium materials is done by modern powder metallurgy. This method allows us to study the structural, mechanical, and controlled corrosion resistance. In the present paper, the effect of cold compaction on magnesium AZ31B alloy are studied, were Ultra-Fined Grained (UFG) Magnesium AZ31B alloys of particle size 60 nm were obtained by 8hrs of Ball milling followed by cold compaction at the pressure of 40Mpa at laboratory temperatures. Sintering process for 8hrs were done for cold compacted specimens at temperatures of 425°C,450°C and 475°C in a Horizontal tubular vacuum furnace. Influence of compacting pressure and sintering were investigated for properties of microstructural, mechanical and corrosion resistance. It was observed that, during cold compaction process for Magnesium AZ31B alloys the product grains are distributed uniformly with less pores and particle boundaries. Homogenization were attended by sintering process and Microstructural, Mechanical properties strength, were shown extensive results of hardness and compressive strength of 516Mpa and 123Mpa, as the sintering temperatures were increased from 425°C to 475°C. The lowest corrosion resistance of 0.35 mm.y-1 is obtained for compacted AZ31B alloy as the temperature of sintering temperature raised to 475°C.