Formation and crystallization of Al-Ni-Ti amorphous alloys

D. H. Kim, W. T. Kim

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

Formation and crystallization behaviors of the Al-Ni-Ti amorphous alloys have been investigated in the present study. Among the amorphous alloy compositions investigated in the present study, only Al87.5Ni10Ti2.5 alloy composition exhibits a good ductility, i.e. 180° bending without fracture, indicating that the ductility of the Al-Ni-Ti amorphous alloys is strongly dependent on the alloy composition. Improved ductility can be obtained only when a few nanometer size Al crystals are embedded in the amorphous matrix. The amorphous Al-Ni-Ti alloys crystallize by either primary crystallization of nanometer-sized fcc-Al phase or by the simultaneous precipitation of fcc-Al and metastable intermetallic compound. The Al-Ni-Ti amorphous alloy showing the bending ductility crystallizes by diffusion-controlled growth of quenched-in Al crystals. On the other hand, the Al-Ni-Ti amorphous alloy without bending ductility crystallizes by diffusion-controlled nucleation and growth process.

Original languageEnglish
Pages (from-to)44-53
Number of pages10
JournalMaterials Science and Engineering A
Volume385
Issue number1-2
DOIs
Publication statusPublished - 2004 Nov 15

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Amorphous alloys
Crystallization
Ductility
crystallization
ductility
Chemical analysis
Crystals
Intermetallics
Nucleation
titanium nickelide
crystals
intermetallics
nucleation
matrices

All Science Journal Classification (ASJC) codes

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

Cite this

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abstract = "Formation and crystallization behaviors of the Al-Ni-Ti amorphous alloys have been investigated in the present study. Among the amorphous alloy compositions investigated in the present study, only Al87.5Ni10Ti2.5 alloy composition exhibits a good ductility, i.e. 180° bending without fracture, indicating that the ductility of the Al-Ni-Ti amorphous alloys is strongly dependent on the alloy composition. Improved ductility can be obtained only when a few nanometer size Al crystals are embedded in the amorphous matrix. The amorphous Al-Ni-Ti alloys crystallize by either primary crystallization of nanometer-sized fcc-Al phase or by the simultaneous precipitation of fcc-Al and metastable intermetallic compound. The Al-Ni-Ti amorphous alloy showing the bending ductility crystallizes by diffusion-controlled growth of quenched-in Al crystals. On the other hand, the Al-Ni-Ti amorphous alloy without bending ductility crystallizes by diffusion-controlled nucleation and growth process.",
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Formation and crystallization of Al-Ni-Ti amorphous alloys. / Kim, D. H.; Kim, W. T.

In: Materials Science and Engineering A, Vol. 385, No. 1-2, 15.11.2004, p. 44-53.

Research output: Contribution to journalArticle

TY - JOUR

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AU - Kim, D. H.

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N2 - Formation and crystallization behaviors of the Al-Ni-Ti amorphous alloys have been investigated in the present study. Among the amorphous alloy compositions investigated in the present study, only Al87.5Ni10Ti2.5 alloy composition exhibits a good ductility, i.e. 180° bending without fracture, indicating that the ductility of the Al-Ni-Ti amorphous alloys is strongly dependent on the alloy composition. Improved ductility can be obtained only when a few nanometer size Al crystals are embedded in the amorphous matrix. The amorphous Al-Ni-Ti alloys crystallize by either primary crystallization of nanometer-sized fcc-Al phase or by the simultaneous precipitation of fcc-Al and metastable intermetallic compound. The Al-Ni-Ti amorphous alloy showing the bending ductility crystallizes by diffusion-controlled growth of quenched-in Al crystals. On the other hand, the Al-Ni-Ti amorphous alloy without bending ductility crystallizes by diffusion-controlled nucleation and growth process.

AB - Formation and crystallization behaviors of the Al-Ni-Ti amorphous alloys have been investigated in the present study. Among the amorphous alloy compositions investigated in the present study, only Al87.5Ni10Ti2.5 alloy composition exhibits a good ductility, i.e. 180° bending without fracture, indicating that the ductility of the Al-Ni-Ti amorphous alloys is strongly dependent on the alloy composition. Improved ductility can be obtained only when a few nanometer size Al crystals are embedded in the amorphous matrix. The amorphous Al-Ni-Ti alloys crystallize by either primary crystallization of nanometer-sized fcc-Al phase or by the simultaneous precipitation of fcc-Al and metastable intermetallic compound. The Al-Ni-Ti amorphous alloy showing the bending ductility crystallizes by diffusion-controlled growth of quenched-in Al crystals. On the other hand, the Al-Ni-Ti amorphous alloy without bending ductility crystallizes by diffusion-controlled nucleation and growth process.

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