Microstructures of Ti50Al45Mo5 alloy powders produced by plasma rotating electrode process

S. Hata, K. Oki, T. Hashimoto, N. Kuwano

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Microstructures of Ti50Al45Mo5 (at.%) alloy powders produced by the plasma rotating electrode process (PREP) were investigated. The powders have inhomogeneous structures, which consist of dendrites and rounded grains. The dendrites, which show a "rosettelike" morphology, are formed on the powder surface and around the rounded grains. The rosettelike dendrites are of hexagonal α2 (D019) phase even though the dendrites have an equiaxial morphology, and a small amount of β2 (B2) phase is also contained inside. It is suggested that the solidification to α (hcp-A3) phase occurred by the peritectic reaction between the primary β (bcc-A2) dendrites and the liquid: L + β → L + β + α. The rounded grains, on the other hand, are of β2 phase in which acicular α or α2 laths are precipitated with the Burgers orientation relationship. Antiphase domain boundaries in the β2 matrix are intersected by α(α2) laths. It is interpreted that the α(α2) laths were formed by the solid-state transformations: β2 → β2 + α → β2 + α2. The formation of the two different microstructures in the powder particles is rationalized in terms of the changes in local composition of the liquid phase during the rapid solidification process.

Original languageEnglish
Pages (from-to)386-393
Number of pages8
JournalJournal of Phase Equilibria
Volume22
Issue number4
DOIs
Publication statusPublished - Aug 2001

Fingerprint

rotating plasmas
dendrites
Powders
Plasmas
microstructure
Microstructure
Electrodes
electrodes
Rapid solidification
Liquids
rapid solidification
antiphase boundaries
Solidification
solidification
liquid phases
solid state
Chemical analysis
matrices
liquids

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Physical and Theoretical Chemistry
  • Metals and Alloys

Cite this

Microstructures of Ti50Al45Mo5 alloy powders produced by plasma rotating electrode process. / Hata, S.; Oki, K.; Hashimoto, T.; Kuwano, N.

In: Journal of Phase Equilibria, Vol. 22, No. 4, 08.2001, p. 386-393.

Research output: Contribution to journalArticle

Hata, S. ; Oki, K. ; Hashimoto, T. ; Kuwano, N. / Microstructures of Ti50Al45Mo5 alloy powders produced by plasma rotating electrode process. In: Journal of Phase Equilibria. 2001 ; Vol. 22, No. 4. pp. 386-393.
@article{857270a523504711946302f36ca79080,
title = "Microstructures of Ti50Al45Mo5 alloy powders produced by plasma rotating electrode process",
abstract = "Microstructures of Ti50Al45Mo5 (at.{\%}) alloy powders produced by the plasma rotating electrode process (PREP) were investigated. The powders have inhomogeneous structures, which consist of dendrites and rounded grains. The dendrites, which show a {"}rosettelike{"} morphology, are formed on the powder surface and around the rounded grains. The rosettelike dendrites are of hexagonal α2 (D019) phase even though the dendrites have an equiaxial morphology, and a small amount of β2 (B2) phase is also contained inside. It is suggested that the solidification to α (hcp-A3) phase occurred by the peritectic reaction between the primary β (bcc-A2) dendrites and the liquid: L + β → L + β + α. The rounded grains, on the other hand, are of β2 phase in which acicular α or α2 laths are precipitated with the Burgers orientation relationship. Antiphase domain boundaries in the β2 matrix are intersected by α(α2) laths. It is interpreted that the α(α2) laths were formed by the solid-state transformations: β2 → β2 + α → β2 + α2. The formation of the two different microstructures in the powder particles is rationalized in terms of the changes in local composition of the liquid phase during the rapid solidification process.",
author = "S. Hata and K. Oki and T. Hashimoto and N. Kuwano",
year = "2001",
month = "8",
doi = "10.1361/105497101770332938",
language = "English",
volume = "22",
pages = "386--393",
journal = "Journal of Phase Equilibria and Diffusion",
issn = "1547-7037",
publisher = "Springer New York",
number = "4",

}

TY - JOUR

T1 - Microstructures of Ti50Al45Mo5 alloy powders produced by plasma rotating electrode process

AU - Hata, S.

AU - Oki, K.

AU - Hashimoto, T.

AU - Kuwano, N.

PY - 2001/8

Y1 - 2001/8

N2 - Microstructures of Ti50Al45Mo5 (at.%) alloy powders produced by the plasma rotating electrode process (PREP) were investigated. The powders have inhomogeneous structures, which consist of dendrites and rounded grains. The dendrites, which show a "rosettelike" morphology, are formed on the powder surface and around the rounded grains. The rosettelike dendrites are of hexagonal α2 (D019) phase even though the dendrites have an equiaxial morphology, and a small amount of β2 (B2) phase is also contained inside. It is suggested that the solidification to α (hcp-A3) phase occurred by the peritectic reaction between the primary β (bcc-A2) dendrites and the liquid: L + β → L + β + α. The rounded grains, on the other hand, are of β2 phase in which acicular α or α2 laths are precipitated with the Burgers orientation relationship. Antiphase domain boundaries in the β2 matrix are intersected by α(α2) laths. It is interpreted that the α(α2) laths were formed by the solid-state transformations: β2 → β2 + α → β2 + α2. The formation of the two different microstructures in the powder particles is rationalized in terms of the changes in local composition of the liquid phase during the rapid solidification process.

AB - Microstructures of Ti50Al45Mo5 (at.%) alloy powders produced by the plasma rotating electrode process (PREP) were investigated. The powders have inhomogeneous structures, which consist of dendrites and rounded grains. The dendrites, which show a "rosettelike" morphology, are formed on the powder surface and around the rounded grains. The rosettelike dendrites are of hexagonal α2 (D019) phase even though the dendrites have an equiaxial morphology, and a small amount of β2 (B2) phase is also contained inside. It is suggested that the solidification to α (hcp-A3) phase occurred by the peritectic reaction between the primary β (bcc-A2) dendrites and the liquid: L + β → L + β + α. The rounded grains, on the other hand, are of β2 phase in which acicular α or α2 laths are precipitated with the Burgers orientation relationship. Antiphase domain boundaries in the β2 matrix are intersected by α(α2) laths. It is interpreted that the α(α2) laths were formed by the solid-state transformations: β2 → β2 + α → β2 + α2. The formation of the two different microstructures in the powder particles is rationalized in terms of the changes in local composition of the liquid phase during the rapid solidification process.

UR - http://www.scopus.com/inward/record.url?scp=0035417551&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0035417551&partnerID=8YFLogxK

U2 - 10.1361/105497101770332938

DO - 10.1361/105497101770332938

M3 - Article

AN - SCOPUS:0035417551

VL - 22

SP - 386

EP - 393

JO - Journal of Phase Equilibria and Diffusion

JF - Journal of Phase Equilibria and Diffusion

SN - 1547-7037

IS - 4

ER -