Lattice Defects Affecting Moisture-Induced Embrittlement of Ni-based L1<sub>2</sub> Ordered Intermetallics
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<jats:title>ABSTRACT</jats:title><jats:p>Moisture-induced embrittlement of Ll<jats:sub>2</jats:sub> alloys (such as Ni<jats:sub>3</jats:sub>(Si,Ti) and Ni<jats:sub>3</jats:sub>AI) 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.</jats:p>
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- MRS Proceedings
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MRS Proceedings 460 1996-01-01
Springer Science and Business Media LLC