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, Minoru Nishida

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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
JournalUnknown Journal
Volume112 II
Publication statusPublished - Oct 2003
Externally publishedYes

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shape memory alloys
precipitates
matrix
matrices
transmission electron microscopy
spacing
temperature
thermal treatment

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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@article{41225a6f41094961ad314f28cbaffc40,
title = "Morphological and crystallographic aspects of C11b-type precipitates nucleated in martensitic and parent phase matrices in Ti-rich Ti-Pd shape memory alloys",
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.",
author = "Solomon, {V. C.} and Minoru Nishida",
year = "2003",
month = "10",
language = "English",
volume = "112 II",
pages = "1039--1042",
journal = "Quaternary International",
issn = "1040-6182",
publisher = "Elsevier Limited",

}

TY - JOUR

T1 - Morphological and crystallographic aspects of C11b-type precipitates nucleated in martensitic and parent phase matrices in Ti-rich Ti-Pd shape memory alloys

AU - Solomon, V. C.

AU - Nishida, Minoru

PY - 2003/10

Y1 - 2003/10

N2 - 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.

AB - 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.

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VL - 112 II

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EP - 1042

JO - Quaternary International

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