The effects of boron in TiAl/Ti/sub 3/Al

Journal Article · Sun Oct 01 00:00:00 EDT 1989 · Scripta Metallurgica; (USA)

DOI:https://doi.org/10.1016/0036-9748(89)90347-5· OSTI ID:5250364

Feng, C R; Michel, D J; Crowe, C R ^[1]

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1. Naval Research Lab., Washington, DC (USA). Material Science and Technology Div.

The authors discuss the TiAl/Ti/sub 3/Al interfacial misfit dislocations structures investigated by TEM in Ti-45Al alloy and Ti-45Al/TiB/sub 2/ composite. For TiAl with c/a = 1.02, only a single set of misfit dislocation arrays are crystallographically possible; these were observed in Ti-45Al alloy. However, the observation of three sets of misfit dislocation arrays in the Ti-45Al/TiB/sub 2/ composite suggests that the occupation of octahedral sites in the TiAl structure by excess boron was responsible for a decrease in the c/a ratio leading to an increased fcc character of the TiAl at the TiAl/Ti/sub 3/Al interface.

• OSTI ID: 5250364
• Journal Information: Scripta Metallurgica; (USA), Journal Name: Scripta Metallurgica; (USA) Vol. 23:10; ISSN 0036-9748; ISSN SCRMB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102 -- Metals & Alloys-- Structure & Phase Studies
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
ALUMINIUM ALLOYS
BORON ADDITIONS
BORON ALLOYS
CRYSTAL STRUCTURE
CRYSTALLOGRAPHY
DISLOCATION PINNING
INTERFACES
METALLURGICAL EFFECTS
MICROSTRUCTURE
TITANIUM ALLOYS