Phase transformation and crystal structures of Ti2Ni3 precipitates in Ti-Ni alloys

Toru Hara, Takuya Ohba, Kazuhiro Otsuka, Minoru Nishida

Research output: Contribution to journalArticle

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Abstract

In Ni-rich Ti-Ni alloys, three kinds of precipitates such as TiNi3, Ti2Ni3 and Ti3Ni4 appear with aging heat-treatments. The shape memory effect and superelasticity of the alloys are greatly affected by the presence of these precipitates. It is interesting to note that the Ti2Ni3 precipitate itself exhibits a phase transformation. However, the characteristics of this transformation is not understood in detail as yet. In the present study, the characteristics of this transformation were studied from crystallographic point of view. The crystal structures of the low- and the high-temperature phases were determined by combining several techniques such as electron diffraction, convergent beam electron diffraction, high resolution electron microscopy and powder X-ray diffraction with the Rietveld analysis. The results of these analyses revealed that the space group of the low- and the high-temperature phases are Bbmm and I 4/mmm, respectively. It was reported that the Ti2(Ni, Cu)3 alloy shows a similar transformation. The relevance of the transformation in this alloy to Ti2Ni3 precipitates is also discussed.

Original languageEnglish
Pages (from-to)277-284
Number of pages8
JournalMaterials Transactions, JIM
Volume38
Issue number4
DOIs
Publication statusPublished - Apr 1997

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phase transformations
Precipitates
precipitates
Crystal structure
Phase transitions
crystal structure
Electron diffraction
electron diffraction
Rietveld analysis
High resolution electron microscopy
Shape memory effect
X ray powder diffraction
electron microscopy
heat treatment
Aging of materials
Heat treatment
Temperature
titanium nickelide
high resolution
diffraction

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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Phase transformation and crystal structures of Ti2Ni3 precipitates in Ti-Ni alloys. / Hara, Toru; Ohba, Takuya; Otsuka, Kazuhiro; Nishida, Minoru.

In: Materials Transactions, JIM, Vol. 38, No. 4, 04.1997, p. 277-284.

Research output: Contribution to journalArticle

Hara, Toru ; Ohba, Takuya ; Otsuka, Kazuhiro ; Nishida, Minoru. / Phase transformation and crystal structures of Ti2Ni3 precipitates in Ti-Ni alloys. In: Materials Transactions, JIM. 1997 ; Vol. 38, No. 4. pp. 277-284.
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