Suppression of environmental embrittlement of Ni{sub 3}(Si,Ti) alloys by shot peening
- Tohoku Univ., Sendai (Japan). Inst. for Materials Research
It has been observed that most ordered intermetallics are very susceptible to embrittlement due to hydrogen released from moisture in an air or from an aqueous solution at ambient temperatures. A recent observation by the present authors showed that tensile elongation of predeformed and then hydrogen-charged Ni{sub 3}(Si,Ti) polycrystals increases with increasing pre-plastic deformation although total amount of absorbed hydrogen content increases. It was suggested from this observation that hydrogen within lattice or trapped to dislocations is ineffective of causing the embrittlement, and conversely effective of suppressing the embrittlement of the Ni{sub 3}(Si,Ti) alloys through reducing hydrogen content enriched to the grain boundaries. Thus, this result indicates that existence of the dislocations is beneficial to reduce the hydrogen embrittlement. Therefore, it is expected that the dislocations existing in the surface layer scavenge the hydrogen atoms injected from the environment, and thereby is effective of suppressing the environmental embrittlement. In this work, the effect of shot-peening on the environmental embrittlement of the Ni{sub 3}(Si,Ti) alloys is investigated by tensile test in different atmosphere at room temperature.
- OSTI ID:
- 205235
- Journal Information:
- Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 7 Vol. 34; ISSN 1359-6462; ISSN XZ503X
- Country of Publication:
- United States
- Language:
- English
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