Metallurgical and Materials Transactions A

, Volume 46, Issue 7, pp 2893–2907 | Cite as

Modeling the Break-up of Nano-particle Clusters in Aluminum- and Magnesium-Based Metal Matrix Nano-composites

  • Anton Manoylov
  • Valdis Bojarevics
  • Koulis Pericleous
Symposium: Advances in Solidification of Metallic Alloys under External Fields

Abstract

Aluminum- and magnesium-based metal matrix nano-composites with ceramic nano-reinforcements promise low weight with high durability and superior strength, desirable properties in aerospace, automobile, and other applications. However, nano-particle agglomerations lead to adverse effects on final properties: large-size clusters no longer act as dislocation anchors, but instead become defects; the resulting particle distribution will be uneven, leading to inconsistent properties. To prevent agglomeration and to break-up clusters, ultrasonic processing is used via an immersed sonotrode, or alternatively via electromagnetic vibration. A study of the interaction forces holding the nano-particles together shows that the choice of adhesion model significantly affects estimates of break-up force and that simple Stokes drag due to stirring is insufficient to break-up the clusters. The complex interaction of flow and co-joint particles under a high frequency external field (ultrasonic, electromagnetic) is addressed in detail using a discrete-element method code to demonstrate the effect of these fields on de-agglomeration.

Keywords

Brownian Motion Interfacial Energy Tangential Force Velocity Pulse Adhesive Contact 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

The authors acknowledge financial support from the ExoMet Project (co-funded by the European Commission (contract FP7-NMP3-LA-2012-280421), by the European Space Agency and by the individual partner organizations).

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2015

Authors and Affiliations

  • Anton Manoylov
    • 1
  • Valdis Bojarevics
    • 1
  • Koulis Pericleous
    • 1
  1. 1.Department of Mathematical Sciences, Centre of Numerical Modelling and Process AnalysisUniversity of GreenwichLondonU.K.

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