Morphological and crystallographic aspects of C11b-type precipitates nucleated in martensitic and parent phase matrices in Ti-rich Ti-Pd shape memory alloys

V. C. Solomon, M. Nishida

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1 Citation (Scopus)

Abstract

Ti2Pd phase with C11b-type structure which precipitates in Ti-rich Ti-Pd shape memory alloys may nucleate either in martensitic phase or parent phase depending upon thermal treatment conditions, since the transformation temperatures are around 800 K. In the alloy aged above Af, three C11b-type precipitate variants are always observed by TEM. The orientation relationship between those three variants and the B19 structure, which was transformed from B2 structure after the precipitation, is as follows: Variant I (001)Ti2Pd// (101̄)B19; Variant II (001)Ti2Pd// (101)B19; Variant III (001)Ti2Pd// (010)B19. The shape of the precipitates was deduced to be disk-like and/or elliptic. On the other hand, only the variants I and II are observed when the precipitates are nucleated in martensitic phase. Since the difference between the lattice spacing of (010)B19 and (001)/3Ti2Pd is about 20%, the formation of a third variant in the martensitic matrix is energetically unfavorable.

Original languageEnglish
Pages (from-to)1039-1042
Number of pages4
JournalJournal De Physique. IV : JP
Volume112 II
DOIs
Publication statusPublished - Oct 2003
Externally publishedYes
EventInternational Conference on Martensitic Transformations - Espoo, Finland
Duration: Jun 10 2002Jun 14 2002

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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