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Solid state recycling of pure Mg and AZ31 Mg machining chips via spark plasma sintering
KU Leuven, Department of Mechanical Engineering, Celestijnenlaan 300A, Heverlee, B-3001, Belgium.
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2016 (English)In: Materials & design, ISSN 0264-1275, E-ISSN 1873-4197, Vol. 109, p. 520-529Article in journal (Refereed) Published
Abstract [en]

This work investigates the applicability of spark plasma sintering (SPS) as a solid state recycling technique for magnesium alloy scrap. In this respect, machining chips from pure Mg and AZ31 Mg alloy ingots are chemically cleaned, cold compacted and SPSed directly into bulk specimens. It is found that SPS can successfully establish full densification and effective metallurgical bonding between chips without altering compositional constituents. This is attributed to the dynamic compaction during sintering as well as to the disruption of the chips' surface oxide film due to SPS electric current based joule heating. Apart from the successful consolidation, microstructural analysis of the initial Mg ingots, chips and SPS recycled material reveals that the SPS microstructure was finer than that of the original ingots due to significant deformation induced grain refinement during machining. As a result, the recycled materials had a higher compression and shear strength than that of the starting ingot material. The findings indicate that SPS is an effective alternative method for solid state recycling of magnesium alloy scrap.

Place, publisher, year, edition, pages
Elsevier, 2016. Vol. 109, p. 520-529
Keywords [en]
Spark plasma sintering, Solid state recycling, Diffusion bonding, Magnesium alloys, Grain refinement, Machining chips
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-266341DOI: 10.1016/j.matdes.2016.07.082ISI: 000384105000056Scopus ID: 2-s2.0-84979590800OAI: oai:DiVA.org:kth-266341DiVA, id: diva2:1383309
Note

QC 20200113

Available from: 2020-01-07 Created: 2020-01-07 Last updated: 2020-01-13Bibliographically approved

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CiteExportLink to record
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