Changes in microstructure near the R-phase transformation in Ti50Ni48Fe2 studied by in-situ electron microscopy

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Abstract

Microstructural changes associated with the martensitic transformation from cubic (parent phase) to trigonal (R phase) which occurs with decreasing temperature in Ti50Ni48Fe2 have been intensively studied by in-situ electron microscopy. Although the parent phase shows a characteristic microstructure with small domains, which are due to lattice modulation as a precursor to the transformation, their temperature dependence is contrasted with that of domains which appear below the transformation temperature in the R phase. The observations convince us that there is an essential difference between the natures of the domains observed in each state, and also reveal the formation of peculiar antiphase-like boundaries within a needle-like variant of the R phase. We also estimate the approximate size of the R phase just after nucleation and compare this with a theoretical consideration on the size of nuclei in martensites.

Original languageEnglish
Pages (from-to)631-638
Number of pages8
JournalPhilosophical Magazine Letters
Volume81
Issue number9
DOIs
Publication statusPublished - Sep 1 2001

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phase transformations
electron microscopy
microstructure
antiphase boundaries
martensitic transformation
martensite
needles
nucleation
modulation
temperature dependence
nuclei
temperature
estimates

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

Changes in microstructure near the R-phase transformation in Ti50Ni48Fe2 studied by in-situ electron microscopy. / Murakami, Yasukazu; Shindo, D.

In: Philosophical Magazine Letters, Vol. 81, No. 9, 01.09.2001, p. 631-638.

Research output: Contribution to journalArticle

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