Microstructure and hardness of scandium trialuminide with ternary rare-earth additions

Yoshihisa Harada*, David C. Dunand

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

10 Scopus citations

Abstract

The microstructure of ternary Al3(Sc1-yRE y) intermetallic compounds (where RE is one of the rare-earth elements La, Ce, Nd, Sm, Eu, Yb or Lu), was investigated as a function of RE concentration for 0<y≤0.75. Alloys with La, Ce, Nd, Sm or Eu additions consist of a L12 phase containing a dendritic second phase with D019 (La, Ce, Nd, Sm) or C11b (Eu) structure. Alloys with Yb or Lu additions show a single L12 phase. The RE solubility limits at 1373 K in the L12-Al3(SC1-yREy) phase are very low for La, Nd, Ce and Eu (0.08-0.41 at.% or y=0.0032-0.0164), low for Sm (3.22 at.% or y=0.1288) and complete for Yb and Lu. The lattice parameter of the L12 solid-solution increases linearly with RE concentration and the magnitude of this effect is correlated with the atomic size mismatch between Sc and the RE elements. The Vickers micro-hardness of the L12 solid-solution increases linearly with increasing RE concentration.

Original languageEnglish (US)
Title of host publicationSupplement to THERMEC 2006, 5th International Conference on PROCESSING and MANUFACTURING OF ADVANCED MATERIALS, THERMEC 2006
PublisherTrans Tech Publications Ltd
Pages1565-1570
Number of pages6
EditionPART 2
ISBN (Print)0878494286, 9780878494286
DOIs
StatePublished - 2007
Event5th International Conference on Processing and Manufacturing of Advanced Materials - THERMEC'2006 - Vancouver, Canada
Duration: Jul 4 2006Jul 8 2006

Publication series

NameMaterials Science Forum
NumberPART 2
Volume539-543
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752

Other

Other5th International Conference on Processing and Manufacturing of Advanced Materials - THERMEC'2006
CountryCanada
CityVancouver
Period7/4/067/8/06

Keywords

  • AlSc
  • Lattice parameter
  • Micro-hardness
  • Microstructure
  • Rare-earth
  • SEM/EDS
  • Scandium
  • X-ray diffraction

ASJC Scopus subject areas

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

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