Abstract
A new method for the rapid processing of thin gage sheet of traditionally difficult-to-process materials, such as γ-TiAl, has been modeled and experimentally developed. The method uses high density infrared (HDI) rapid heating of a plasma arc lamp to liquid-phase sinter powder metal compact precursors to structures of varying densities. Material properties for precursor γ-TiAl compacts were effectively chosen or determined and then used with a finite-volume heat-transfer modeling code to model the process. With the aid of the model, processing parameters were determined that allowed for a temperature gradient across the sheet that would produce a liquid-phase cast structure on the surface, residual powder on the backside, and a middle layer solid + liquid zone. Temperature and phase fields were predicted through the thickness of the sheet using the model. Fine grain, lamellar structured materials were produced in the liquid-phase-sintered zone.
| Original language | English |
|---|---|
| Pages (from-to) | 1289-1299 |
| Number of pages | 11 |
| Journal | Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science |
| Volume | 37 |
| Issue number | 4 |
| DOIs | |
| State | Published - Apr 2006 |
Funding
The authors acknowledge Dr. R. Keith Bird and the NASA Langley Research Center for funding this work (Interagency Agreement No. 46WR43101). Further thanks are extended to Dr. Nancy Yang and the Sandia National Laboratory Electron Optics Lab for providing the SEI and BEI imaging.
| Funders | Funder number |
|---|---|
| Langley Research Center | 46WR43101 |