Melting point depression and microstructure in ball-milled nanocrystalline aluminum powders

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7 Citations (Scopus)

Abstract

Ball-milled aluminum powders have been investigated by differential scanning calorimetry (DSC) and high resolution X-ray line profile analysis. Ball-milling was carded out for different milling times ranging from 45 min to 32 days. The milling time dependence of the average grain-size and of the density of lattice defects, mainly dislocations, were determined by the modified Williamson-Hall and Warren-Averbach procedures based on the dislocation model of mean square strain. Evolution of the average grain-size and microstructure has been revealed by continuous heat treatments up to different temperatures and annealings at 900 K for different time intervals of the sample milled for 32 days. Calorimetric measurements indicated the decrease of the melting point, Tm with increasing milling time. The melting point depression was found to be proportional to inverse grain size.

Original languageEnglish
Pages (from-to)I/-
JournalMaterials Science Forum
Volume343
Publication statusPublished - Jan 1 2000
EventISMANAM-99: The International Symposium on Metastable, Mechanically Alloyed and Nanocrystalline Materials - Dresden, Ger
Duration: Aug 30 1999Sep 3 1999

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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