Nucleation and growth in undercooled melts of bulk-metallic-glass forming Zr 60 Ni 25 Al 15 alloy

Hideyuki Yasuda, Yuki Tamura, Tomoya Nagira, Itsuo Ohnaka, Yoshihiko Yokoyama, Akihisa Inoue

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

A livitation method using alternating and static magnetic fields was used to measure nucleation and growth of the crystalline phases in melts of the bulk-metallic-glass forming Zr 50 Ni 25 Al 15 alloy. For comparison, Zr 66.7 Ni 33.3 and Zr 66.5 Ni 33.2 Al 0.3 were also examined. Nucleation undercooling in the bulk-metallic-glass forming Zr 60 Ni 25 Al 15 alloy did not depend on the cooling rate (<10 2 K/s), and the maximum undercooling observed was approximately 200K. Recalescence was not observed in the cooling curves of the Zr 60 Ni 25 Al 15 and the Zr 66.5 Ni 33.2 Al 0.3 alloys. The growth velocity of the crystalline phase in the Zr 60 Ni 25 Al 15 alloy was of the order of 10 -4 m/s even at a undercooling of 100 K. In contrast, clear recalescence was always observed in the Zr 66.7 Ni 33.3 alloy. The results showed that the addition of Al into the Zr-Ni alloy significantly reduced growth velocity of the crystalline phases. The extremely low growth rate in the Zr-Ni-Al system can contribute to the high glass forming ability.

Original languageEnglish
Pages (from-to)2762-2767
Number of pages6
JournalMaterials Transactions
Volume46
Issue number12
DOIs
Publication statusPublished - 2005 Dec 1

Keywords

  • Bulk metallic glass
  • Levitation
  • Undercooled melt

ASJC Scopus subject areas

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

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