Crystallization of Co58-xMn20GexB10Si12 (x = 5, 10) metallic glasses

Sang U. Lim, Jeon Kim, S. W. Hwang, C. K. Kim, Chong Seung Yoon

Research output: Contribution to journalArticle

Abstract

Germanium was introduced at different fractions (5 and 10 at.%) into the Co58Mn20B10Si12 (numbers indicate at.%) alloy to study its effect on the crystallization behavior of the amorphous alloy. It was shown that the Ge addition delayed the onset of devitrification by ∼20 °C, forcing the primary crystallization to nearly coincide with the subsequent eutectic reaction. Metastable SiB6 was observed to co-nucleate with Co2Mn(SiGe) due to the Si rejection from Co2Mn(SiGe) when annealed at 550 °C for both alloys. In addition, Co48Mn20Ge10B10Si12 exhibited a pronounced structural relaxation behavior which was absent in the Ge-free Co-Mn alloys. Estimation of the activation energies showed that increasing Ge addition forced the crystallization kinetics progressively sluggish. We demonstrated that the Ge addition to the Co-Mn amorphous alloy had substantial effects both on the crystallization path and on the kinetics, which well correlated to the ensuing magnetic properties of the thermally annealed Co-Mn-Ge amorphous alloys.

Original languageEnglish
Pages (from-to)531-534
Number of pages4
JournalMaterials Science and Engineering A
Volume448-451
DOIs
Publication statusPublished - 2007 Mar 25

Keywords

  • Amorphous alloys
  • Co-Mn amorphous alloys
  • Metallic glasses

ASJC Scopus subject areas

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

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