Intrinsic ductility of Ni{sub 3}Al with and without boron at 77K

Journal Article · Thu Jun 01 04:00:00 EDT 1995 · Scripta Metallurgica et Materialia

DOI:https://doi.org/10.1016/0956-716X(95)00028-T· OSTI ID:69685

Lee, K H; White, C L ^[1]

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1. Michigan Technological Univ., Houghton, MI (United States). Dept. of Metallurgical and Materials Engineering

Tensile ductilities of Ni{sub 3}Al with and without boron were examined at liquid nitrogen temperature and at room temperature. The ductility of boron-free Ni{sub 3}Al significantly increased at liquid nitrogen temperature. This is believed to be due to the relatively moisture free condition attained at 77 K. In contrast to this, the ductility of boron-doped Ni{sub 3}Al was insensitive to the test temperature as well as environment, and fracture mode remained predominantly transgranular. Ductilizing boron effect observed at liquid nitrogen temperature can be regarded as an intrinsic one. Combining these results, it is very likely that boron had dual role, intrinsically improving grain boundary properties and suppressing moisture-induced embrittlement. Further work is required to study details of the beneficial boron effect in moist environment.

• OSTI ID: 69685
• Journal Information: Scripta Metallurgica et Materialia, Journal Name: Scripta Metallurgica et Materialia Journal Issue: 11 Vol. 32; ISSN 0956-716X; ISSN SCRMEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
ARGON
BORON
BORON ADDITIONS
DOPED MATERIALS
DUCTILITY
ELONGATION
EMBRITTLEMENT
ENVIRONMENT
FRACTURE PROPERTIES
GRAIN BOUNDARIES
INTERMETALLIC COMPOUNDS
METALLURGICAL EFFECTS
NICKEL ALLOYS
OXYGEN
TEMPERATURE DEPENDENCE