Characterisation of nano-sized Al-Mn-(Mg) particles in AZ91 and their effect on Mg17Al12 precipitation

Research output: Contribution to journalArticlepeer-review


Colleges, School and Institutes


Al-Mn-(Mg) particles in the size range of 20-200 nm have been found in a sand cast AZ91 magnesium alloy. Their morphologies, chemical composition and structures were investigated using transmission electron microscopy. It was found that these particles have a chemical composition of (Al 6.52Mn)1-xMgx (x <0.13) and a decagonal quasi-crystalline structure. These particles were stable during a solution treatment at 420 °C for 72 h and acted as preferential nucleation sites for Mg17Al12 precipitates during the subsequent ageing. The potential effect of these Al-Mn-(Mg) particles on the strengthening of AZ91 magnesium alloys is discussed.


Original languageEnglish
Pages (from-to)34-38
Number of pages5
JournalJournal of Alloys and Compounds
Publication statusPublished - 2013


  • Metals and alloys, Precipitation, Quasicrystals, Transmission electron microscopy