Melting Point of Pure Cr and Phase Equilibria in the Cr-Si Binary System

Kazushige Ioroi, Yuki Aono, Xiao Xu, Toshihiro Omori, Ryosuke Kainuma

研究成果: Article査読


The melting point of pure Cr and phase equilibria in the Cr-Si binary system were determined by thermal analysis using a differential scanning calorimeter (DSC) and differential thermal analyzer (DTA). In addition, the composition of two-phase alloys was analyzed using an electron probe microanalyzer (EPMA). Heat treatment above 1500 °C was conducted in a high-frequency induction heating furnace, where the temperature was estimated by a two-color pyrometer with an accuracy of ± 20 °C. The melting point of pure Cr was determined to be 1861 ± 3 °C, considering the O and N impurities. The phase diagram of the Cr-Si system was determined in the whole composition range. The invariant reaction related to the formation of Cr3Si and Cr5Si3 phases was confirmed as the eutectic reaction of liquid ↔ Cr3Si + Cr5Si3. The solubility range of Cr3Si phase is on the Cr-rich side from the stoichiometric composition, whereas the solubility range of Cr5Si3 phase extends toward the Si-rich side. We found using the x-ray diffraction that the α-Cr5Si3/β-Cr5Si3 transformation does not exist.

ジャーナルJournal of Phase Equilibria and Diffusion
出版ステータスPublished - 2022 4月

ASJC Scopus subject areas

  • 凝縮系物理学
  • 金属および合金
  • 材料化学


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