Anomalous thermal expansion of cold-rolled Ti-Nb-Ta-Zr alloy

Masaaki Nakai, Mitsuo Niinomi, Toshikazu Akahori, Harumi Tsutsumi, Xiaoliang Feng, Michiharu Ogawa

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)


Negative thermal expansion, i.e. a type of shrinkage that occurs during heating, was observed in cold-rolled Ti-29Nb-13Ta-4.6Zr alloy (mass%) (TNTZ). The reduction ratio of cold rolling and the angle of the longitudinal axis of specimens with respect to the cold-rolling direction were systematically changed, and then the thermal expansion rate was measured using a dilatometer. Further, the cyclicity of thermal expansion was examined for the cold-rolled TNTZ. From the results, it is observed that with an increase in the reduction ratio of cold rolling, the thermal expansion rate of TNTZ cold-rolled parallel to the rolling direction (RD) decreases, but it increases in TNTZ cold-rolled parallel to the transverse direction (TD). With regard to the anisotropy of thermal expansion, the thermal expansion rate increases with the angle between the longitudinal axis of the specimens and RD. Further, the cyclicity of the above-mentioned anomalous thermal expansion is observed in a temperature range below 473 K, but it is not observed when the specimen is heated above 573 K in the first cycle.

Original languageEnglish
Pages (from-to)423-426
Number of pages4
JournalMaterials Transactions
Issue number2
Publication statusPublished - 2009 Feb


  • Cold rolling
  • Thermal expansion
  • Titanium alloy

ASJC Scopus subject areas

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


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