Abstract
Near shape forming of magnesium (Mg) alloys offers a significant opportunity for structural material lightweight. In this work, conventional press and sinter near shape processing has been applied to commercial AZ91D and pure Mg powders. Results indicate these powders are reasonably compressible achieving green densities of 88 to 98% ρTh with limited cracking. Sintering of these compacted powders is challenging and requires both solid state and transient liquid phase mass transport apparently due to the inherent powder particle surface oxide layer. Resultant press and sintered materials are characterized for density, porosity distribution, hardness, microstructure, and phase development. Throughout this effort, specific attention is paid to the affect oxygen, as an adsorbed contaminant and a surface thin film, presents as an impediment to solid and transient liquid state densification. Results of this work are intended to advance near shape processing of Mg alloy and Mg powders for potential structural applications.
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Acknowledgements
This work was partially supported by two CSU/AAUP University Faculty Research Grants Banner Index ARJOHL and ARJOHM, two CCSU Foundation Faculty—Student Research Grants Banner Index AFJONK and AFJOHM, and funding from a CT Next Higher Education Fund grant from the state of Connecticut, Dr. G.J. Gallo, University of Connecticut (UCONN) Principal Investigator.
The donation of Mg and AZ91D powders by ESM Group, Inc. Amherst, NY and ACRAWAX C lubricant by Lonza, Inc. Williamsport, PA are gratefully acknowledged. The assistance of National Sintered Alloys, Inc. Clinton, CT in performing compaction processing of powders is greatly appreciated. Access to thermal analysis instrumentation located in the Thermal Analysis Lab of the Institute of Materials Sciences at UCONN, Storrs, CT is acknowledged. Last, electron microscopy was performed using the facilities at the UCONN/Thermo Fisher Scientific Center for Advanced Microscopy and Materials Analysis also in Storrs, CT.
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Johnson, S.C., Goncalves, D.G. (2021). Magnesium and Magnesium Alloy Powder Processing Towards the Development of Near Shape Structural Materials. In: Miller, V.M., Maier, P., Jordon, J.B., Neelameggham, N.R. (eds) Magnesium Technology 2021. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-030-65528-0_18
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