Low-temperature superplasticity in nanostructured nickel and metal alloys

Superplasticity - the ability of a material to sustain large plastic deformation - has been demonstrated in a number of metallic, intermetallic and ceramic systems. Conditions considered necessary for superplasticity are a stable fine-grained microstructure and a temperature higher than 0.5 T m (whe...

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Bibliographic Details
Published in:Nature (London) 1999-04, Vol.398 (6729), p.684-686
Main Authors: Mukherjee, A. K, McFadden, S. X, Mishra, R. S, Valiev, R. Z, Zhilyaev, A. P
Format: Article
Language:English
Subjects:
Alloys
Humanities and Social Sciences
letter
Low temperature
Materials science
Melting point
Metals
multidisciplinary
Nanotechnology
Nickel
Science
Science (multidisciplinary)
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Summary:Superplasticity - the ability of a material to sustain large plastic deformation - has been demonstrated in a number of metallic, intermetallic and ceramic systems. Conditions considered necessary for superplasticity are a stable fine-grained microstructure and a temperature higher than 0.5 T m (where T m is the melting point of the matrix). Superplastic behaviour is of industrial interest, as it forms the basis of a fabrication method that canbeused to produce components having complex shapes from materials that are hard to machine, such as metal matrix composites and intermetallics. Use of superplastic forming may become even more widespread if lower deformation temperatures can be attained. Here we present observations of low-temperature superplasticity in nanocrystalline nickel, a nanocrystalline aluminium alloy (1420-Al), and nanocrystalline nickel aluminide (Ni3Al). The nanocrystalline nickel was found to be superplastic ata temperature 470 °C below that previously attained: this corresponds to 0.36T m, the lowest normalized superplastic temperature reported for any crystalline material. The nanocrystalline Ni3Al was found to be superplastic at a temperature 450 °C below the superplastic temperature in the microcrystalline regime.
ISSN:0028-0836
1476-4687
DOI:10.1038/19486