| Autor: |
Stephen L. Sass, M. D. Vaudin, R.A.D. Mackenzie |
| Rok vydání: |
1988 |
| Předmět: |
|
| Zdroj: |
Le Journal de Physique Colloques. 49:C5-227 |
| ISSN: |
0449-1947 |
| DOI: |
10.1051/jphyscol:1988524 |
| Popis: |
Ni3Al is a potentially useful high temperature alloy. In its single crystal form it exhibits good ductility, however in polycrystalline form the pure alloy is highly prone to intergranular failure. It has been seen that in slightly nickel-rich alloys the addition of small amounts of boron has the effect of dramatically increasing the material ductility and of changing the failure mode from intergranular to transgranular. In alloys which have been ductilitized by boron addition, atom probe investigation has shown the boron to be segregated to grain boundaries. This segregation may induce a change in the boundary structure as has been seen by Sickafus and Sass in gold doped iron bicrystals.Small angle boundaries in polycrystals and fabricated bicrystals have been examined using transmission electron microscopy. The bicrystals were produced by hot pressing misoriented single crystals of either pure or doped Ni3Al. Boundaries have been observed in a variety of fabricated bicrystals. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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