Coherent phase equilibrium in the Ni-V system

D. K. Na, J. B. Cohen*, P. W. Voorhees

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

The influence of coherency strains on phase equilibrium has been examined experimentally in Ni-V alloys using in-situ high-temperature X-ray diffraction. The composition changes due to coherency strains have been sampled through shifts in the peak positions. The misfit versus temperature and the elastic constants of the α and β phases were investigated in order to compare experimental results with existing theories. Long-range order vs. temperature was also measured to examine its contribution to the misfit. The influence of coherency is small, but the basic tenets of the theories are supported: (1) the lever rule does not hold in the presence of coherency strains; (2) the composition is different for coherent and incoherent phases. The incoherent phase boundaries were also calculated from the data.

Original languageEnglish (US)
Pages (from-to)10-15
Number of pages6
JournalMaterials Science and Engineering: A
Volume272
Issue number1
DOIs
StatePublished - Nov 15 1999

Funding

This work was funded by the NSF under grants No. DMR 8417961 and DMR 9224298. It is a portion of a thesis submitted by D.K. Na in partial fulfillment of the requirements for a Ph.D. degree at Northwestern University in January 1997. The authors thank Professor G. Olson, Professor M. E. Fine, and K. Peters for valuable comments and J. Carsello for assistance in Northwestern University’s X-ray Facility, supported in part by the Northwestern MRSEC funded by NSF. We congratulate Professor Herman for his many successful years as he brought this journal to its current level.

Keywords

  • Coherency
  • Phase-rule
  • Precipitation

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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