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Microstructures of rapidly solidified aluminum alloy submicron powders
| Content Provider | Semantic Scholar |
|---|---|
| Author | Levi, Carlos G. Mehrabian, Robert |
| Copyright Year | 1982 |
| Abstract | The microstructures of electron transparent submicron aluminum alloy powders produced by an electrohydrodynamic process are described. The observations are coupled with thermodynamic, kinetic, and heat flow concepts to deduce the thermal history and solidification mode of the powders. The range of microstructures observed includes: homogeneous plane-front solidified single crystals; cellular crystals; and powders containing blocky segregates, multiple grains, and twins. In general, a decrease in the size of the submicron particles decreases the amount of segregation. This observation appears to be caused by an increase in undercooling prior to nucleation which leads to higher liquid/solid interface velocities. On the other hand, the same trend promotes multiple nucleation and increases the incidence of twin crystals. Liquid/solid interface breakdown from planar to cellular in the middle of the powders is correlated with solute “trapping” during recalescence and rejection of solute ahead of the solidification front after recalescence. The latter manifests itself as a solute depleted zone in the plane-front to cellular transition region. Finally, some of the microstructural observations lend credence to the recent extension of the morphological stability theory to rapid solidification. |
| Starting Page | 13 |
| Ending Page | 23 |
| Page Count | 11 |
| File Format | PDF HTM / HTML |
| DOI | 10.1007/BF02642411 |
| Alternate Webpage(s) | https://page-one.springer.com/pdf/preview/10.1007/BF02642411 |
| Alternate Webpage(s) | https://doi.org/10.1007/BF02642411 |
| Volume Number | 13 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
