Abstract
Grain boundary structures of Ni3Al intermetallic alloys different in ductility are examined by electron back scattering pattern (EBSP) method. Special boundaries like Σ3 and Σ1 were observed frequently in these alloys, suggesting a correlation between the frequencies of these special boundaries and mechanical ductility. The frequency of these special boundaries become higher in the order as Ni75Al25 with boron, Ni76Al24 with boron, Ni75Al23Pd2, normal purity Ni76.5Al23.5 and high purity Ni76.5Al23.5. This order is independent of the order of ductility. The mechanism of ductilization in Ni3Al is discussed based on a chemical bonding effect in grain boundary vicinity applicable for boron-doped alloy and a grain boundary geometry effect for Pd doped and purified Ni3Al alloys.
Original language | English |
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Pages (from-to) | 516-522 |
Number of pages | 7 |
Journal | Zeitschrift fuer Metallkunde/Materials Research and Advanced Techniques |
Volume | 91 |
Issue number | 6 |
Publication status | Published - 2000 Jun 1 |
ASJC Scopus subject areas
- Condensed Matter Physics
- Physical and Theoretical Chemistry
- Metals and Alloys
- Materials Chemistry