A study of mechanical alloying processes using reactive milling and discrete element modeling

Trent S. Ward, Wenliang Chen, Mirko Schoenitz, Rajesh N. Dave, Edward L. Dreizin

Research output: Contribution to journalArticlepeer-review

76 Scopus citations

Abstract

The milling progress of mechanical alloying in SPEX shaker mills was investigated using different ball sizes and ball to powder mass ratios (charge ratios). Reactive materials were used, for which an exothermic reaction is mechanically triggered after a certain period of milling. The milling progress was determined experimentally from the temperature trace of the milling vial exhibiting a peak at the time of such a reaction. An expression for the milling dose was introduced to describe the effect of different milling parameters on the milling progress. In the first approximation, the milling dose leading to the mechanically triggered reaction remained constant over a range of charge ratios and could, therefore, be used to gauge the milling progress. The milling progress was described theoretically using the discrete element method. The theoretical milling dose that correlates well with its experimental analog was found to depend on the head-on impact energy dissipation rate. The presented approach is suitable for scale-up and optimization of mechanical alloying of various materials.

Original languageEnglish (US)
Pages (from-to)2909-2918
Number of pages10
JournalActa Materialia
Volume53
Issue number10
DOIs
StatePublished - Jun 2005

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

Keywords

  • Discrete element method
  • Mechanical alloying
  • Milling dose
  • Milling progress

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