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

Sang U. Lim, Jeon Kim, Suk-Won 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
Externally publishedYes

Fingerprint

Metallic glass
Amorphous alloys
metallic glasses
Crystallization
crystallization
Germanium
Structural relaxation
Crystallization kinetics
Eutectics
Magnetic properties
Activation energy
kinetics
eutectics
rejection
germanium
activation energy
magnetic properties

Keywords

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

ASJC Scopus subject areas

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

Cite this

Crystallization of Co58-xMn20GexB10Si12 (x = 5, 10) metallic glasses. / Lim, Sang U.; Kim, Jeon; Hwang, Suk-Won; Kim, C. K.; Yoon, Chong Seung.

In: Materials Science and Engineering A, Vol. 448-451, 25.03.2007, p. 531-534.

Research output: Contribution to journalArticle

Lim, Sang U. ; Kim, Jeon ; Hwang, Suk-Won ; Kim, C. K. ; Yoon, Chong Seung. / Crystallization of Co58-xMn20GexB10Si12 (x = 5, 10) metallic glasses. In: Materials Science and Engineering A. 2007 ; Vol. 448-451. pp. 531-534.
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AU - Kim, Jeon

AU - Hwang, Suk-Won

AU - Kim, C. K.

AU - Yoon, Chong Seung

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N2 - 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.

AB - 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.

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