Consolidation behaviour of AZ80 magnesium chips: influence of compaction pressure and holding time on porosity, interfaces and mechanical response
A. Murillo-Marrodán, E. García, T. Nakata
TL;DR
This paper explores how compaction pressure and holding time affect the consolidation of AZ80 magnesium chips during recycling, focusing on density, structure, and mechanical properties.
Contribution
The study reveals that holding time, not peak pressure, is key to achieving uniform density and improved mechanical performance in magnesium chip consolidation.
Findings
Extended holding time improves green density to ~91–92% with uniform axial distribution.
Stiffness is more influenced by interfacial integrity than bulk density.
Higher stiffness (2964 MPa) is achieved with superior geometric sealing.
Abstract
Solid-state recycling of magnesium alloys relies on effective pre-compaction to convert loose machining chips into dense precursors suitable for downstream processing. This study investigates the consolidation mechanisms of AZ80 Mg chips containing residual water-based lubricants, compacted in a single-action hydraulic press without prior cleaning. The compaction pressure, holding time, and pressure evolution were analyzed to determine their influence on briquette quality. The findings demonstrated that holding time, rather than peak pressure, was the governing factor for densification. Extended holding promoted internal stress redistribution and geometric adaptation, facilitating pore collapse and yielding green densities of ~ 91–92% with uniform axial distribution, while short holding times limited effective stress transmission, resulting in heterogeneous density gradients.…
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Taxonomy
TopicsMagnesium Alloys: Properties and Applications · Aluminum Alloys Composites Properties · Advanced Welding Techniques Analysis