Stability of nanocrystallites dispersed in Cu 50Zr 45Ti 5 metallic glass under electron irradiation

Guoqiang Xie, Qingsheng Zhang, Dmitri Valentinovich Louzguine, Wei Zhang, Akihisa Inoue

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Effect of electron irradiation on stability of nanocrystallites dispersed in a glassy matrix of a Cu 50Zr 45Ti 5 bulk metallic glass (BMG) alloy was investigated. Microstructural evolution during electron irradiation was observed and analyzed by means of conventional and high-resolution transmission electron microscopy (CTEM and HRTEM) and X-ray energy dispersive spectroscopy (EDS). The crystalline nanoparticles of monoclinic CuZr phase formed in-situ in as-cast Cu 50Zr 45Ti 5 alloy exhibited a high stability against electron irradiation. No obvious changes in their size, morphology, and crystal structure were observed during electron irradiation, though new crystalline nanoparticles nucleated and precipitated in the glassy matrix under electron irradiation. The new nanoparticles formed upon irradiation have a similar composition and crystal structure to those formed in-situ in the as-cast alloy. The nanocrystalline precipitates in the glassy matrix are proposed to be mainly due to electron knock-on effect under electron irradiation, which promotes atomic diffusion and assists the crystallization of the glassy phase. The present result indicates that electron irradiation to metallic glasses has potential for producing nanocrystalline structure and nanocrystalline-glassy composite structure.

Original languageEnglish
Pages (from-to)3286-3293
Number of pages8
JournalJournal of Nanoscience and Nanotechnology
Volume7
Issue number9
DOIs
Publication statusPublished - 2007 Sep 1

Keywords

  • CuZrTi
  • Electron irradiation
  • Metallic glass
  • Nanocrystallite
  • TEM

ASJC Scopus subject areas

  • Medicine(all)

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