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Abstract
Magnesium oxide (MgO) films and particles have been collected by pressurised filtration of a Mg-8.6wt%Al-0.67wt%Zn (AZ91D) alloy melt. The morphology of the oxides and their interfaces with the-Mg phase were investigated by high-resolution transmission electron microscopy. It was found that the oxide films consisted of large numbers of sub-micrometre-sized MgO particles, and that melt shearing can effectively break up the oxide films and disperse the oxide particles. For the first time, orientation relationships (ORs) of OR I: [1 1̄ 1]MgO2 from (0 0 0 1)α-Mg and (0 1 1)MgO//[2 1̄ 1̄ 0)α-Mg; and OR II: (1̄ 1̄ 1)MgO//(1 1̄ 0 1)α-Mg and [0 1 1]MgO//[1̄ 2 1̄ 1̄]α-Mg, were observed between the MgO particles and the α-Mg matrix. The calculated Bramfitt planar disregistries were 5.5% and 2.5% for the two ORs, respectively, indicating good lattice matching between MgO and α-Mg at the interface. With the evidence of grain refinement effect observed in the sheared AZ91D magnesium alloy, the possibility of MgO particles to act as potent nucleants for heterogeneous nucleation of α-Mg grains is discussed in terms of the crystallographic criterion. © 2011 Taylor &Francis.
Original language | English |
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Pages (from-to) | 516-529 |
Number of pages | 13 |
Journal | Philosophical Magazine Letters |
Volume | 91 |
Issue number | 8 |
DOIs | |
Publication status | Published - Aug 2011 |
Keywords
- interface
- magnesium alloys
- magnesium oxide
- transmission electron microscopy
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Dive into the research topics of 'Characterisation of magnesium oxide and its interface with α-Mg in Mg-Al-based alloys'. Together they form a unique fingerprint.Projects
- 1 Finished
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Light Alloys towards environmentally sustainable transport: 2nd generation solutions for Advanced Metallic Systems ( LATEST 2 )
Thompson, G. (PI), Bate, P. (CoI), Prangnell, P. (CoI), Preuss, M. (CoI), Quinta Da Fonseca, J. (CoI), Robson, J. (CoI), Skeldon, P. (CoI) & Zhou, X. (CoI)
1/02/10 → 31/07/15
Project: Research