Variation of grain size in vapor deposited titanium coatings on beryllium substrates

Technical Report · Wed Jan 01 04:00:00 EST 1986

OSTI ID:5475508

Jankowski, A F; Wilford, T O

The increase in grain size (to a final constant value) during deposition is a well known occurrence in physical vapor deposition. Columnar grain structures result as the coating thickens beyond the point of constant grain size (in general, for those thicknesses greater than approximately 25 ..mu..m). As the deposition is taking place, the grain size of the Ti coating increases from that on the order of 0.01 ..mu..m to that greater than 1.0 ..mu..m. At a certain critical thickness during deposition, t/sub c/, the grain size stabilizes. In this study, the minimum coating thickness required to produce the ultimate grain size is sought. The effect of coating texture and deposition conditions on coating to substrate bond strength has been established in earlier work. Purpose of this investigation is then to relate the critical thickness to achieve a stable grain size with the texture of the coating. The distribution of grain size within the coating may provide a qualitative characterization of the stress relief driven growth in grain size which produces enhanced bonding of the Ti coating to its Be substrate.

• Research Organization: Rockwell International Corp., Golden, CO (USA). Rocky Flats Plant
• DOE Contract Number: AC04-76DP03533
• OSTI ID: 5475508
• Report Number(s): RFP-3996; ON: DE86014928
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360101* -- Metals & Alloys-- Preparation & Fabrication
ALKALINE EARTH METALS
BERYLLIUM
CRYSTAL STRUCTURE
DEPOSITION
DIMENSIONS
ELEMENTS
GRAIN SIZE
METALS
MICROSTRUCTURE
SIZE
SURFACE COATING
TEXTURE
THICKNESS
TITANIUM
TRANSITION ELEMENTS