Lattice defects affecting moisture-induced embrittlement of Ni-based L1{sub 2} ordered intermetallics
- Tohoku Univ., Sendai (Japan). Inst. for Materials Research
Moisture-induced embrittlement of L1{sub 2} alloys (such as Ni{sub 3}(Si,Ti) and Ni{sub 3}Al) is observed by tensile test and SEM fractography. A variety of microstructures were prepared by selecting pre-deformation and heat treatment conditions. It is shown that tensile ductility and the associated fractography depend on structure as well as test atmosphere. Well-annealed specimens are susceptible to moisture-induced embrittlement while pre-deformed specimens are resistive to moisture-induced embrittlement. Also, this embrittlement is generally sensitive to the heat treatment scheme preceded by the pre-deformation. Results indicate that the embrittlement occurs when hydrogen is enriched on grain boundaries. On the other hand, the embrittlement can be suppressed when hydrogen is trapped at lattice defects such as dislocations and vacancies. These results are discussed in association with the kinetics of hydrogen in the pre-deformed microstructure.
- OSTI ID:
- 571868
- Report Number(s):
- CONF-961202-; TRN: IM9806%%125
- Resource Relation:
- Conference: 1996 Fall meeting of the Materials Research Society (MRS), Boston, MA (United States), 2-6 Dec 1996; Other Information: PBD: 1997; Related Information: Is Part Of High-temperature ordered intermetallic alloys VII; Koch, C.C. [ed.] [North Carolina State Univ., Raleigh, NC (United States)]; Liu, C.T. [ed.] [Oak Ridge National Lab., TN (United States)]; Stoloff, N.S. [ed.] [Rensselaer Polytechnic Inst., Troy, NY (United States)]; Wanner, A. [ed.] [Univ. Stuttgart (Germany)]; PB: 799 p.; Materials Research Society symposium proceedings, Volume 460
- Country of Publication:
- United States
- Language:
- English
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