Microstructure observations in rare earth element Gd-modified Ti-44 at% Al

W. Li, B. Inkson, Zenji Horita, K. Xia

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Rare earth element Gd (0.15 at%) was added to Ti-44 at% Al to refine the microstructure. Almost all of the Gd atoms were found to form an oxide phase which was tentatively identified as Gd2TiO5. In the as-cast ingot the oxide phase possessed a complicated "finger" shaped morphology and formed a networked structure between the primary crystals. This morphology was broken down in the subsequent heat treatment at 1350°C to become discrete particles in the form of particulate, platelets or rods, often with a faceted appearance, although clusters of the particles reminiscent of their as-cast morphology were common. The distribution of the particles was improved by hot pressing which appeared to reduce the particle size and de-cluster them. Although the particles were not actually pinning the grain boundaries, their distribution seemed to have a significant effect on lamellar grain sizes after heat treatment. The addition of Gd appeared also to promote the formation of lamellae during cooling.

Original languageEnglish
Pages (from-to)519-523
Number of pages5
JournalIntermetallics
Volume8
Issue number5-6
Publication statusPublished - Dec 1 2000

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Rare earth elements
Oxides
Microstructure
Heat treatment
Hot pressing
Ingots
Platelets
Grain boundaries
Particle size
Cooling
Atoms
Crystals

All Science Journal Classification (ASJC) codes

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

Cite this

Li, W., Inkson, B., Horita, Z., & Xia, K. (2000). Microstructure observations in rare earth element Gd-modified Ti-44 at% Al. Intermetallics, 8(5-6), 519-523.

Microstructure observations in rare earth element Gd-modified Ti-44 at% Al. / Li, W.; Inkson, B.; Horita, Zenji; Xia, K.

In: Intermetallics, Vol. 8, No. 5-6, 01.12.2000, p. 519-523.

Research output: Contribution to journalArticle

Li, W, Inkson, B, Horita, Z & Xia, K 2000, 'Microstructure observations in rare earth element Gd-modified Ti-44 at% Al', Intermetallics, vol. 8, no. 5-6, pp. 519-523.
Li W, Inkson B, Horita Z, Xia K. Microstructure observations in rare earth element Gd-modified Ti-44 at% Al. Intermetallics. 2000 Dec 1;8(5-6):519-523.
Li, W. ; Inkson, B. ; Horita, Zenji ; Xia, K. / Microstructure observations in rare earth element Gd-modified Ti-44 at% Al. In: Intermetallics. 2000 ; Vol. 8, No. 5-6. pp. 519-523.
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