Sadangi R.,Armament Research and Development and Engineering Center |
Kapoor D.,Armament Research and Development and Engineering Center |
Zahrah T.,MATSYS, Inc. |
Tandon R.,Magnesium Electronic Powder Products |
Madan D.,Magnesium Electronic Powder Products
Advances in Powder Metallurgy and Particulate Materials - 2014, Proceedings of the 2014 World Congress on Powder Metallurgy and Particulate Materials, PM 2014 | Year: 2014
Fine-grained magnesium alloys with optimal combination of strength and ductility are being sought for lightweight structural applications. Prior work focused on hot isostatic pressing (HIP) and extrusion of commercially available gas-atomized WE43B powders. Powder Metallurgy (PM) processed materials displayed similar or better properties than cast and wrought materials. The HIP-ed materials showed prior particle boundaries and inhomogeneous microstructure, essentially retaining the solidification-induced segregation of the atomized powder. Subsequently the materials were extruded to redistribute the prior particle boundaries and improve the microstructural homogeneity. The objective of this work is two fold: (a) to reestablish and optimize processing parameters to ensure reproducible mechanical properties in WE43 magnesium alloys as was obtained in prior work and to extend the similar PM processing steps to AZ91E and EL21 magnesium alloy powders, (b) to investigate milling as an option to redistribute the oxides prior to HIP consolidation so that favorable properties can be obtained without the use of extrusion.