Behavior of hydrogen in V-Zr-Ti-Ni protium absorption alloys by tritium radioluminography

Hideyuki Saitoh, Hirofumi Homma, Toshihei Misawa, Takuya Tamura, Takahiro Kuriiwa, Atsunori Kamegawa, Masuo Okada, Toshiyuki Ohnishi

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Tritium radioluminography has been applied to V-Zr-Ti-Ni protium absorption alloys with the two-phase structure of BCC phase and Laves phase to examine the behavior of protium. The specimens were V77.8Zr6Ti8.8Ni7.4 and V54.5Zr18.25Ti11.25Ni16, the ratio of the BCC phase to the Laves phase in them being 4:1 and 1:1, respectively. In the range of lower hydrogen content as hydride never formed, hydrogen concentration in the Laves phase is observed to be higher than in the BCC phase by tritium radioluminography. The protium concentration in the BCC phase and Laves phase in the alloy has been determined to be 70 mass ppm and 1300 mass ppm, respectively. It has been found that the preferential path for the protium penetration into the alloy is not the BCC phase but the Laves phase. In the range of higher hydrogen content as hydride formed, the amount of absorbed hydrogen has increased when the ratio of BCC phase to Laves phase increases, by the PCT measurement. It has been found that the main hydrogen storaging phase is BCC phase. An extraordinal phenomenon has been observed for the time dependence of hydrogen concentration by the radioluminography. That is, the hydrogen concentration in the BCC region decreases for a few days after hydrogen charging and then changes to increse, while the hydrogen concentration in other region decreases successively.

Original languageEnglish
Pages (from-to)763-766
Number of pages4
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume64
Issue number9
DOIs
Publication statusPublished - 2000 Jan 1

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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