The effect of pre-deformation on environmental embrittlement of Ni{sub 3}(Si,Ti) alloys
- Tohoku Univ., Sendai (Japan). Inst. for Materials Research
The interaction of hydrogen with ordered intermetallics is academically interesting and industrially important. Recent studies on Ni{sub 3}(Si,Ti) alloys showed that residual hydrogen strongly interacts with crystal defects such as grain boundaries, dislocations and vacancies. For example, a few mass ppM residual hydrogen can embrittle the Ni{sub 3}(Si,Ti) alloys when hydrogen is trapped to grain boundaries, while a few ppM residual hydrogen are ineffective of embrittling the Ni{sub 3}(Si,Ti) alloys when hydrogen is dispersed in lattices, or, trapped to dislocations. Furthermore, a recent study showed that shot-peened Ni{sub 3}(Si,Ti) alloy was not embrittled in air although unshot-peened Ni{sub 3}(Si,Ti) alloy has been shown to be greatly embrittled in air. This beneficial effect by shot-peening was discussed, based on interaction (i.e., scavenging effect) of the hydrogen atoms with dislocations (or vacancies) introduced into the surface region. These studies reveal that the interaction of hydrogen with crystal defects is particularly important to understand the hydrogen-induced embrittlement (and also hydrogen-related properties) in ordered intermetallics. In this work, the effect of pre-deformation on environmental embrittlement of the Ni{sub 3}(Si,Ti) alloys is investigated by tensile test at room temperature in air, comparing with the result in vacuum. Embrittlement/ductility property is assessed by tensile elongation and fracture behavior.
- OSTI ID:
- 247986
- Journal Information:
- Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 10 Vol. 34; ISSN 1359-6462; ISSN XZ503X
- Country of Publication:
- United States
- Language:
- English
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