Evidence of room temperature ductility in nanocrystalline NiAl from biaxial disk bend tests

Journal Article · Mon Sep 15 04:00:00 EDT 1997 · Scripta Materialia

DOI:https://doi.org/10.1016/S1359-6462(97)00159-0· OSTI ID:540984

Choudry, M S ^[1]; Eastman, J A; DiMelfi, R J ^[2]; Dollar, M ^[1]

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1. Illinois Inst. of Tech., Chicago, IL (United States)
2. Argonne National Lab., IL (United States)

The main conclusions drawn from this study are: (1) The substantial room temperature ductility observed in nanocrystalline NiAl samples suggests that diffusional mechanisms such as grain boundary sliding controlled by grain boundary diffusion are contributing substantially to deformation. (2) Grain size refinement to <10 nm in NiAl results in yield strengths larger than the typical stress at failure of coarse grained NiAl. (3) Postmortem SEM fractographs obtained after BDBT suggested a macroscopic ductile failure mode in case of nanocrystalline NiAl and a brittle failure mode in case of coarse grained NiAl. (4) While the use of BDBT may influence the properties measured compared to those obtained by other methods such as tensile testing, the test method alone is not responsible for the observation of room temperature ductility in the present case.

• OSTI ID: 540984
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 6 Vol. 37; ISSN 1359-6462; ISSN SCMAF7
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
BENDING
DEFORMATION
DUCTILITY
GRAIN BOUNDARIES
GRAIN SIZE
INTERMETALLIC COMPOUNDS
NICKEL ALLOYS
STRESSES
YIELD STRENGTH