Thermal conductivity of Ni3(Si,Ti) single-phase alloys

Satoshi Semboshi, Tatsuro Takeuchi, Yasuyuki Kaneno, Akihiro Iwase, Takayuki Takasugi

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Thermal conductivities of Ni3(Si,Ti) single-phase alloys with an L12 structure as functions of composition and temperature were measured to provide information for high-temperature structural applications. It was confirmed that the Ni3(Si,Ti) alloy has an extremely large single-phase region for the compositions Ni78(Si22-x,Tix) (x = 0–12 at.%), Ni89−y(Si11,Tiy) (y = 9.5–12 at.%), and Ni89−z(Siz,Ti11) (z = 9.5–12 at.%). The thermal conductivities at 293 K of all the Ni3(Si,Ti) single-phase alloys were estimated to be between 8 W/mK and 12 W/mK, which are lower than those of almost all other stoichiometric compounds. In the Ni3(Si,Ti) single-phase region, the thermal conductivity increased more significantly by increasing the Ni content than by varying the Si and Ti contents. The thermal conductivity of all the Ni3(Si,Ti) single-phase alloys increased monotonically with an increase in temperature. The temperature coefficient of thermal conductivity increased as the value of the thermal conductivity at 293 K was low, according to Mooij's relationship. Consequently, the thermal conductivity in the Ni3(Si,Ti) single-phase region became larger and less sensitive to the composition at higher temperatures above 1073 K, ranging between 22 W/mK and 24 W/mK.

Original languageEnglish
Pages (from-to)119-125
Number of pages7
JournalIntermetallics
Volume92
DOIs
Publication statusPublished - 2018 Jan

Keywords

  • A. Intermetallics (Ni(Si, Ti) alloys)
  • B. Thermal properties
  • D. Microstructure
  • E. Physical properties

ASJC Scopus subject areas

  • Chemistry(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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