Structure and decomposition behaviour of rapidly solidified MgNdX (X Al, Si) Alloys

W. J. Park, Hyun Park, D. H. Kim, Nack J. Kim

Research output: Contribution to journalArticle

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Abstract

The microstructural characteristics and decomposition behaviour of rapidly solidified MgNdX (X Al, Si) alloys were investigated by detailed transmission electron microscopy. Rapid solidification of Mg8Nd, Mg8Nd1Al and Mg8Nd1Si produces various types of solidification microstructure depending on the alloy composition, i.e. fine precipitates of Mg3Nd in as-melt-spun Mg8Nd, f.c.c. phase (a = 14.8 Å) at the cell boundaries in as-melt-spun Mg8Nd1Al, and supersaturated α-mg grains with fine particles at the grain boundaries in as-melt-spun Mg8Nd1Si. Annealing of as-rapidly solidified Mg8Nd and Mg8Nd1Si up to 300 °C results in precipitation and coarsening of the Mg3Nd phase. However, no significant change occurs in Mg8Nd1Al on annealing up to 300 °C. On annealing at 400 °C, the pre-existing phase decomposes forming new phases stable at 400 °C, i.e. an f.c.c. phase (a = 5.4 A ̊) in Mg8Nd, an f.c.c. phase a = A ̊, Al2Nd in Mg8Nd1Al, and Mg9Nd in Mg8Nd1Si. The present study shows that of the three alloys investigated, Mg8Nd1Al can have the highest thermal stability owing to the fine, thermally stable Al2Nd particles which appear on annealing at the higher temperature of 400 °C.

Original languageEnglish
Pages (from-to)637-640
Number of pages4
JournalMaterials Science and Engineering A
Volume179-180
Issue numberPART 1
DOIs
Publication statusPublished - 1994 May 1

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Annealing
Decomposition
decomposition
annealing
rapid solidification
Rapid solidification
Coarsening
solidification
Solidification
Precipitates
precipitates
Grain boundaries
Thermodynamic stability
thermal stability
grain boundaries
Transmission electron microscopy
transmission electron microscopy
microstructure
Microstructure
cells

All Science Journal Classification (ASJC) codes

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

Cite this

Park, W. J. ; Park, Hyun ; Kim, D. H. ; Kim, Nack J. / Structure and decomposition behaviour of rapidly solidified MgNdX (X Al, Si) Alloys. In: Materials Science and Engineering A. 1994 ; Vol. 179-180, No. PART 1. pp. 637-640.
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abstract = "The microstructural characteristics and decomposition behaviour of rapidly solidified MgNdX (X Al, Si) alloys were investigated by detailed transmission electron microscopy. Rapid solidification of Mg8Nd, Mg8Nd1Al and Mg8Nd1Si produces various types of solidification microstructure depending on the alloy composition, i.e. fine precipitates of Mg3Nd in as-melt-spun Mg8Nd, f.c.c. phase (a = 14.8 {\AA}) at the cell boundaries in as-melt-spun Mg8Nd1Al, and supersaturated α-mg grains with fine particles at the grain boundaries in as-melt-spun Mg8Nd1Si. Annealing of as-rapidly solidified Mg8Nd and Mg8Nd1Si up to 300 °C results in precipitation and coarsening of the Mg3Nd phase. However, no significant change occurs in Mg8Nd1Al on annealing up to 300 °C. On annealing at 400 °C, the pre-existing phase decomposes forming new phases stable at 400 °C, i.e. an f.c.c. phase (a = 5.4 A ̊) in Mg8Nd, an f.c.c. phase a = A ̊, Al2Nd in Mg8Nd1Al, and Mg9Nd in Mg8Nd1Si. The present study shows that of the three alloys investigated, Mg8Nd1Al can have the highest thermal stability owing to the fine, thermally stable Al2Nd particles which appear on annealing at the higher temperature of 400 °C.",
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Structure and decomposition behaviour of rapidly solidified MgNdX (X Al, Si) Alloys. / Park, W. J.; Park, Hyun; Kim, D. H.; Kim, Nack J.

In: Materials Science and Engineering A, Vol. 179-180, No. PART 1, 01.05.1994, p. 637-640.

Research output: Contribution to journalArticle

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T1 - Structure and decomposition behaviour of rapidly solidified MgNdX (X Al, Si) Alloys

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AU - Park, Hyun

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N2 - The microstructural characteristics and decomposition behaviour of rapidly solidified MgNdX (X Al, Si) alloys were investigated by detailed transmission electron microscopy. Rapid solidification of Mg8Nd, Mg8Nd1Al and Mg8Nd1Si produces various types of solidification microstructure depending on the alloy composition, i.e. fine precipitates of Mg3Nd in as-melt-spun Mg8Nd, f.c.c. phase (a = 14.8 Å) at the cell boundaries in as-melt-spun Mg8Nd1Al, and supersaturated α-mg grains with fine particles at the grain boundaries in as-melt-spun Mg8Nd1Si. Annealing of as-rapidly solidified Mg8Nd and Mg8Nd1Si up to 300 °C results in precipitation and coarsening of the Mg3Nd phase. However, no significant change occurs in Mg8Nd1Al on annealing up to 300 °C. On annealing at 400 °C, the pre-existing phase decomposes forming new phases stable at 400 °C, i.e. an f.c.c. phase (a = 5.4 A ̊) in Mg8Nd, an f.c.c. phase a = A ̊, Al2Nd in Mg8Nd1Al, and Mg9Nd in Mg8Nd1Si. The present study shows that of the three alloys investigated, Mg8Nd1Al can have the highest thermal stability owing to the fine, thermally stable Al2Nd particles which appear on annealing at the higher temperature of 400 °C.

AB - The microstructural characteristics and decomposition behaviour of rapidly solidified MgNdX (X Al, Si) alloys were investigated by detailed transmission electron microscopy. Rapid solidification of Mg8Nd, Mg8Nd1Al and Mg8Nd1Si produces various types of solidification microstructure depending on the alloy composition, i.e. fine precipitates of Mg3Nd in as-melt-spun Mg8Nd, f.c.c. phase (a = 14.8 Å) at the cell boundaries in as-melt-spun Mg8Nd1Al, and supersaturated α-mg grains with fine particles at the grain boundaries in as-melt-spun Mg8Nd1Si. Annealing of as-rapidly solidified Mg8Nd and Mg8Nd1Si up to 300 °C results in precipitation and coarsening of the Mg3Nd phase. However, no significant change occurs in Mg8Nd1Al on annealing up to 300 °C. On annealing at 400 °C, the pre-existing phase decomposes forming new phases stable at 400 °C, i.e. an f.c.c. phase (a = 5.4 A ̊) in Mg8Nd, an f.c.c. phase a = A ̊, Al2Nd in Mg8Nd1Al, and Mg9Nd in Mg8Nd1Si. The present study shows that of the three alloys investigated, Mg8Nd1Al can have the highest thermal stability owing to the fine, thermally stable Al2Nd particles which appear on annealing at the higher temperature of 400 °C.

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