The antiphase boundary energies of L1{sub 2} ordered Ni{sub 74.5}Pd{sub 2}Al{sub 23.5} alloy

Journal Article · Tue Apr 01 04:00:00 EST 1997 · Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science

DOI:https://doi.org/10.1007/s11661-997-0240-1· OSTI ID:484856

Sun, J ^[1]; Lee, C S; Lai, J K.L. ^[2]

---

1. Shanghai Jiao-Tong Univ. (China)
2. City Univ. of Hong Kong, Kowloon (Hong Kong). Dept. of Physics and Materials Science

It is well known that the yield strength of L1{sub 2} ordered intermetallic compound Ni{sub 3}Al increases anomalously with increasing temperature. Therefore, Ni{sub 3}Al increases anomalously with increasing temperature. Therefore, Ni{sub 3}Al alloys have potentially attractive properties for components used at high temperature and have received considerable attention during the past few decades. However, polycrystalline Ni{sub 3}Al exhibits intergranular embrittlement at room temperature. In addition to the microalloying with boron, which significantly improves the ductility of Ni{sub 3}Al, addition of ternary elements is performed to improve the mechanical properties of Ni{sub 3}Al alloys. According to Chiba et al., these ternary elements have been classified as {gamma} formers, which substitute the Ni sublattice, such as Pd, Pt, Co, and Cu, or {gamma} formers which substitute the Al sublattice, such as Zr, Hf, Ta, and Ti, and the ductility of Ni{sub 3}Al can be enhanced by alloying with {gamma} formers, while Ni{sub 3}Al remains brittle if doped with {gamma} formers. In the present article, the influence of Pd doping on the structure of the antiphase boundary (APB)-coupled dislocations and the APB energies in the deformed Ni{sub 3}Al alloy is reported.

• Sponsoring Organization: USDOE
• OSTI ID: 484856
• Journal Information: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Journal Name: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science Journal Issue: 4 Vol. 28; ISSN MMTAEB; ISSN 1073-5623
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
BURGERS VECTOR
DISLOCATIONS
DUCTILITY
ENERGY
EXPERIMENTAL DATA
INTERMETALLIC COMPOUNDS
MICROSTRUCTURE
NICKEL BASE ALLOYS
ORDER PARAMETERS
PALLADIUM ALLOYS