New precipitate phase in Pd and Ni rich Ti-Pd-Ni shape memory alloys

Y. Shirakawa, Y. Morizono, M. Nishida

Research output: Contribution to journalConference article

6 Citations (Scopus)

Abstract

The decomposition behavior and morphology of new precipitate in Pd and Ni rich Ti-Pd-Ni high temperature shape memory alloys have been studied by differential scanning calorimeter (DSC) and transmission electron microscopy (TEM). The precipitate is formed in Ti48Pd52-XNiX alloys with X = 11 to 36 at%Ni. The precipitate appears with exothermic peak about 650 to 700 K and resolves with endothermic peak with about 740 to 780 K in DSC heating curve for the quenched alloys. The both peak temperatures increase with increasing Ni concentration. The shape of precipitate changes from cuboid to oval sphere shapes with increasing Ni concentration. The electron diffraction patterns of the precipitate are characterized by 1/4{111} superlattice reflections in B2 reciprocal space. The Ti48Pd31Ni21 alloy aged under constrained condition at 673 K for 36 ks shows reversible shape memory effect during thermal cycling between room temperature and 523 K.

Original languageEnglish
Pages (from-to)171-174
Number of pages4
JournalMaterials Science Forum
Volume327
Publication statusPublished - Jan 1 2000
Externally publishedYes
EventProceedings of the 1999 International Symposium and Exhibition on Shape Memory Materials (SMM'99) - Kanazawa, Jpn
Duration: May 19 1999May 21 1999

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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