Thermal conductivity mapping of the Ni-Al system and the beta-NiAl phase in the Ni-Al-Cr system

Ji Cheng Zhao, Xuan Zheng, David G. Cahill

Research output: Contribution to journalArticle


We use two examples to highlight the power of micron-scale-resolution thermal conductivity mapping on graded compositions created in a diffusion-multiple sample in rapid establishment of composition-phase-property relationships. The Ni-NiAl diffusion couple example clearly shows the effects of solid solutioning, order-disorder transition, and compositional point defects on thermal conductivity. Thermal conductivity mapping of the beta-NiAl phase region of an Ni-Cr-NiAl diffusion triple clearly shows that Cr substitutes for both Ni and Al sites in beta-NiAl without a strong preference, which is also found not to be strongly composition dependent.

Original languageEnglish (US)
Pages (from-to)935-938
Number of pages4
JournalScripta Materialia
Issue number11
StatePublished - Jun 1 2012



  • Diffusion
  • Nickel aluminides
  • Ordering
  • Point defects
  • Thermal conductivity

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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