Formation of nano-scale ω-phase in arc-melted micron-scale dendrite reinforced Zr73.5Nb9Cu7Ni1Al9.5 ultrafine composite during heat treatment

K. B. Kim; J. Das; M. H. Lee; D. H. Kim; W. H. Lee; J. Eckert

doi:10.1016/j.intermet.2007.12.014

Formation of nano-scale ω-phase in arc-melted micron-scale dendrite reinforced Zr_73.5Nb₉Cu₇Ni₁Al_9.5 ultrafine composite during heat treatment

K. B. Kim, J. Das, M. H. Lee, D. H. Kim, W. H. Lee, J. Eckert

Department of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

An arc-melted Zr_73.5Nb₉Cu₇Ni₁Al_9.5 alloy consists of dendritic body-centered cubic solid solution and a mixture of ultrafine body-centered tetragonal Zr₂Cu-type and hexagonal close-packed MgZn₂-type phases in the ultrafine matrix. This composite exhibits two exothermic reactions upon heating to 973 K with a heating rate of 40 K/min. After the first exothermic reaction nano-scale ω-phase particles have formed in the β-phase dendrites indicating a decomposition of the supersaturated solid solution upon heating. At the early stage during the decomposition of the β-phase the ω-phase is coherent with the parent phase without clear structural differences. However, semicoherency between the β- and the nano-scale ω-phase regions was observed during the growth of the ω-phase. This structural semicoherency causes nano-scale twinning in the β-phase dendrites around the ordered ω-phase in order to release the mismatch energy at the interfaces between the ordered ω- and β-phases.

Original language	English
Pages (from-to)	538-543
Number of pages	6
Journal	Intermetallics
Volume	16
Issue number	4
DOIs	https://doi.org/10.1016/j.intermet.2007.12.014
Publication status	Published - 2008 Apr

Bibliographical note

Funding Information:
This work was supported by the Korea Science and Engineering Foundation (KOSEF) grant funded by the Korea government (MOST) (R01-2007-000-10549-0), the Global Research Laboratory Program of Korea Ministry of Science and Technology, and the EU within the framework of the Research Training Network on ductile bulk metallic glass composites (MRTN-CT-2003-504692).

All Science Journal Classification (ASJC) codes

Chemistry(all)
Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

Access to Document

10.1016/j.intermet.2007.12.014

Cite this

@article{8dffcf1dd8954e47b576e368b29c4b20,

title = "Formation of nano-scale ω-phase in arc-melted micron-scale dendrite reinforced Zr73.5Nb9Cu7Ni1Al9.5 ultrafine composite during heat treatment",

abstract = "An arc-melted Zr73.5Nb9Cu7Ni1Al9.5 alloy consists of dendritic body-centered cubic solid solution and a mixture of ultrafine body-centered tetragonal Zr2Cu-type and hexagonal close-packed MgZn2-type phases in the ultrafine matrix. This composite exhibits two exothermic reactions upon heating to 973 K with a heating rate of 40 K/min. After the first exothermic reaction nano-scale ω-phase particles have formed in the β-phase dendrites indicating a decomposition of the supersaturated solid solution upon heating. At the early stage during the decomposition of the β-phase the ω-phase is coherent with the parent phase without clear structural differences. However, semicoherency between the β- and the nano-scale ω-phase regions was observed during the growth of the ω-phase. This structural semicoherency causes nano-scale twinning in the β-phase dendrites around the ordered ω-phase in order to release the mismatch energy at the interfaces between the ordered ω- and β-phases.",

author = "Kim, {K. B.} and J. Das and Lee, {M. H.} and Kim, {D. H.} and Lee, {W. H.} and J. Eckert",

note = "Funding Information: This work was supported by the Korea Science and Engineering Foundation (KOSEF) grant funded by the Korea government (MOST) (R01-2007-000-10549-0), the Global Research Laboratory Program of Korea Ministry of Science and Technology, and the EU within the framework of the Research Training Network on ductile bulk metallic glass composites (MRTN-CT-2003-504692). ",

year = "2008",

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doi = "10.1016/j.intermet.2007.12.014",

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volume = "16",

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journal = "Intermetallics",

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AU - Kim, K. B.

AU - Das, J.

AU - Lee, M. H.

AU - Kim, D. H.

AU - Lee, W. H.

AU - Eckert, J.

N1 - Funding Information: This work was supported by the Korea Science and Engineering Foundation (KOSEF) grant funded by the Korea government (MOST) (R01-2007-000-10549-0), the Global Research Laboratory Program of Korea Ministry of Science and Technology, and the EU within the framework of the Research Training Network on ductile bulk metallic glass composites (MRTN-CT-2003-504692).

PY - 2008/4

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N2 - An arc-melted Zr73.5Nb9Cu7Ni1Al9.5 alloy consists of dendritic body-centered cubic solid solution and a mixture of ultrafine body-centered tetragonal Zr2Cu-type and hexagonal close-packed MgZn2-type phases in the ultrafine matrix. This composite exhibits two exothermic reactions upon heating to 973 K with a heating rate of 40 K/min. After the first exothermic reaction nano-scale ω-phase particles have formed in the β-phase dendrites indicating a decomposition of the supersaturated solid solution upon heating. At the early stage during the decomposition of the β-phase the ω-phase is coherent with the parent phase without clear structural differences. However, semicoherency between the β- and the nano-scale ω-phase regions was observed during the growth of the ω-phase. This structural semicoherency causes nano-scale twinning in the β-phase dendrites around the ordered ω-phase in order to release the mismatch energy at the interfaces between the ordered ω- and β-phases.

AB - An arc-melted Zr73.5Nb9Cu7Ni1Al9.5 alloy consists of dendritic body-centered cubic solid solution and a mixture of ultrafine body-centered tetragonal Zr2Cu-type and hexagonal close-packed MgZn2-type phases in the ultrafine matrix. This composite exhibits two exothermic reactions upon heating to 973 K with a heating rate of 40 K/min. After the first exothermic reaction nano-scale ω-phase particles have formed in the β-phase dendrites indicating a decomposition of the supersaturated solid solution upon heating. At the early stage during the decomposition of the β-phase the ω-phase is coherent with the parent phase without clear structural differences. However, semicoherency between the β- and the nano-scale ω-phase regions was observed during the growth of the ω-phase. This structural semicoherency causes nano-scale twinning in the β-phase dendrites around the ordered ω-phase in order to release the mismatch energy at the interfaces between the ordered ω- and β-phases.

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