Project Title:

Rapidly Solidified Titanium Alloys by Melt Overflow

01.03-5444
Rapidly Solidified Titanium Alloys by Melt Overflow
Ribbon Technology Corp.
PO Box 30758
Gahanna
OH
43230
Gaspar
Thomas
NAS1-18288
Amount:   
LaRC
NAS1-17978

Abstract:

   The feasibility of casting rapidly solidfied aluminum alloys, magnesiumalloys and titanium alloys was demonstrated during Phase I research project.  A mathematical
model of melt overflow was developed to predict cast dimensions from process parameters.
 The model was verified by laboratory experiments.  Microstructural analysis of the
foils cast by melt overflow led to estimates of cooling rates on the order of 105
K/s or greater.  The proposed Phase II research project will be directed toward the
production of rapidly solidified titanium alloys having gine uniform microstructures,
minimum gaseous and foreign object impurities, dimensional and compositional uniformity
and reproducibility.  A facility that combines transferred plasma arc melting and
melt overflow will be designed, constructed, operated and maintained at Ribbon Technology
Corporation.  Mathematical and physical models of the Melt Overflow Process will
be developed.  Processing experiments will be conducted to cast rapidly solidified
titanium alloy foils, filaments, and particulate.  A
 sample quantity of 10 kg will be delivered to NASA.  The microstructures and compositions
of the rapidly solidified titanium alloys will be evaluated.  The melt overflow process
will be evaluated for commercial scale operation.