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

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

    Research output: Contribution to journalConference articlepeer-review

    25 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
    DOIs
    Publication statusPublished - 2000
    Event5th IUMRS International Conference on Advanced Materials - Symposium D: Intermetallic Compounds and Bulk Metallic Glasses - Beijing, China
    Duration: Jun 13 1999Jun 18 1999

    All Science Journal Classification (ASJC) codes

    • General Chemistry
    • Mechanics of Materials
    • Mechanical Engineering
    • Metals and Alloys
    • Materials Chemistry

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