The influence of residual hydrogen and moisture-released hydrogen on the embrittlement of Ni[sub 3](Al,Ti) single crystals

Journal Article · Sat Oct 01 00:00:00 EDT 1994 · Acta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-7151(94)90484-7· OSTI ID:6989426

Takasugi, T; Hanada, S ^[1]

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1. Tohoku Univ., Sendai (Japan). Inst. for Materials Research

The influence of residual hydrogen and hydrogen released from environment on the embrittlement of the Ni[sub 3] (Al,Ti) single crystals with [001] orientation was investigated by the tensile tests at a room temperature both in air and vacuum, using specimens containing residual hydrogen in a wide range of contents (0.6--70 massppm). The tensile elongation and the UTS values of specimens deformed in air were primarily insensitive to the residual hydrogen contents, and the associated fractography exhibited the brittle fracture mode along the (001) plane. On the other hand, the tensile elongation and the UTS values of specimens deformed in vacuum were strongly sensitive to the residual hydrogen contents. With decreasing the residual hydrogen content, the tensile elongation and the UTS values increased, and the associated fractography changed from the brittle manner to the ductile manner. These results indicate that the ductility of the Ni[sub 3] (Al,Ti) single crystals deformed in air is controlled by hydrogen released from moisture in air while that of the Ni[sub 3] (Al,Ti) single crystals deformed in vacuum is controlled by residual hydrogen.

• OSTI ID: 6989426
• Journal Information: Acta Metallurgica et Materialia; (United States), Journal Name: Acta Metallurgica et Materialia; (United States) Vol. 42:10; ISSN 0956-7151; ISSN AMATEB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
ALUMINIUM ALLOYS
DATA
EMBRITTLEMENT
EXPERIMENTAL DATA
GRAIN ORIENTATION
HYDROGEN EMBRITTLEMENT
INFORMATION
MECHANICAL PROPERTIES
MICROSTRUCTURE
NICKEL ALLOYS
NICKEL BASE ALLOYS
NUMERICAL DATA
ORIENTATION
TENSILE PROPERTIES
TITANIUM ALLOYS