Competitive Heterogeneous Nucleation Between Zr and MgO Particles in Commercial Purity Magnesium View Full Text


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Article Info

DATE

2018-04-10

AUTHORS

G. S. Peng, Y. Wang, Z. Fan

ABSTRACT

Grain refining of commercial purity (CP) Mg by Zr addition with intensive melt shearing prior to solidification has been investigated. Experimental results showed that, when intensive melt shearing is imposed prior to solidification, the grain structure of CP Mg exhibits a complex changing pattern with increasing Zr addition. This complex behavior can be attributed to the change of nucleating particles in terms of their crystal structure, size, and number density with varied Zr additions. Naturally occurring MgO particles are found to be {100} faceted with a cubic morphology and 50 to 300 nm in size. Such MgO particles are usually populated densely in a liquid film (usually referred as oxide film) and can be effectively dispersed by intensive melt shearing. It has been confirmed that the dispersed MgO particles can act as nucleating substrates resulting in a significant grain refinement of CP Mg when no other more potent particles are present in the melt. However, Zr particles in the Mg-Zr alloys are more potent than MgO particles for nucleation of Mg due to their same crystal structure and similar lattice parameters with Mg. With the addition of Zr, Zr and the MgO particles co-exist in the melt. Grain refining efficiency is closely related to the competition for heterogeneous nucleation between Zr and the MgO particles. The final solidified microstructure is mainly determined by the interplay of three factors: nucleation potency (measured by lattice misfit), particle size, and particle number density. More... »

PAGES

2182-2192

References to SciGraph publications

  • 2012-11-08. An Epitaxial Model for Heterogeneous Nucleation on Potent Substrates in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 2009-12. Grain refining mechanisms in magnesium alloys — An overview in TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS
  • 1981-09. Grain refinement in magnetically stirred GTA welds of aluminum alloys in METALLURGICAL AND MATERIALS TRANSACTIONS B
  • 2012-11-08. Grain Refinement of Magnesium Alloys: A Review of Recent Research, Theoretical Developments, and Their Application in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 2000-11. The role of solute in grain refinement of magnesium in METALLURGICAL AND MATERIALS TRANSACTIONS A
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    http://scigraph.springernature.com/pub.10.1007/s11661-018-4594-3

    DOI

    http://dx.doi.org/10.1007/s11661-018-4594-3

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