Formation and thermal stability of an oxide dispersion in a rapidly solidified Ti-Er alloy

Journal Article · Fri Jul 01 04:00:00 EDT 1983 · Scr. Metall.; (United States)

DOI:https://doi.org/10.1016/0036-9748(83)90271-5· OSTI ID:5416355

Konitzer, D G; Fraser, H L; Muddle, B C

There have been a number of reports concerning the strengthening of Ti alloys through the production of a fine dispersion of oxides. The oxides employed are usually those of Y and rare earth elements such as Er, Nd and Ce, since it is expected that these phases will exhibit reasonable stability against coarsening during exposure at elevated temperatures. It is also important that a fine, uniform dispersion of oxides be produced, otherwise improvement in properties will not be realized. When conventional processing techniques are used in the fabrication of these materials, the resulting dispersions are, in general, coarse and rather inhomogeneous. A possible solution to this problem involves the application of rapid solidification processing (RSP), since refinement and increased homogeneity of microstructure are expected in material processed in this manner. Although the results of two such studies have demonstrated the potential for RSP in the production of a refined distribution of oxides, optimum dispersions have not yet been effected. In addition, it is necessary to determine the thermal stability of dispersions obtained using RSP, in order to assess the possible useful application of these alloys. In the present research program, attempts are being made to produce a refined dispersion of Er/sub 2/O/sub 3/ in Ti using RSP. Rapid solidification is effected by use of laser surface melting of a pre-cast binary Ti-Er alloy; the rapidly solidified, laser modified region is cut from the surface of the alloy sub-strate and used for subsequent experiments. Microstructural characterization is performed on samples in the as-solidified and heat treated conditions. This paper describes some preliminary results of this study, and demonstrates that thermally stable dispersions of Er/sub 2/O/sub 3/ can be produced using RSP.

• Research Organization: Dept. of Metallurgy and the Materials Research Laboratory
• DOE Contract Number: AC02-76ER01198
• OSTI ID: 5416355
• Journal Information: Scr. Metall.; (United States), Journal Name: Scr. Metall.; (United States) Vol. 17:7; ISSN SCRMB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOY SYSTEMS
ALLOYS
BINARY ALLOY SYSTEMS
CHALCOGENIDES
CRYSTAL STRUCTURE
DISPERSIONS
ERBIUM ADDITIONS
ERBIUM ALLOYS
ERBIUM COMPOUNDS
ERBIUM OXIDES
GRAIN REFINEMENT
HEAT TREATMENTS
HEATING
LASER-RADIATION HEATING
MECHANICAL PROPERTIES
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
PLASMA HEATING
RARE EARTH ADDITIONS
RARE EARTH ALLOYS
RARE EARTH COMPOUNDS
RESEARCH PROGRAMS
SOLIDIFICATION
THERMODYNAMIC PROPERTIES
TITANIUM ALLOYS