The role of grain size in the mechanical properties of metals
The role of grain size in the mechanical properties of metals
It is now well established that the grain size is the fundamental microstructural feature of all polycrystalline materials. In practice, a very wide range of grain sizes will be needed in order to fully evaluate the effect of grain size on the mechanical properties of metals. For many years this was a significant limitation because it was not possible to use conventional thermomechanical processing
to produce materials with submicrometer or nanometer grain sizes. Recently, this problem has been addressed by developing alternative processing techniques based on the application of severe plastic deformation. This overview demonstrates that, although the flow stress increases with decreasing
grain size at low temperatures and decreases with decreasing grain size at high temperatures, this clear dichotomy in behavior may be adequately explained by using a single theoretical flow mechanism
based on the occurrence of grain boundary sliding.
equal-channel angular pressing, grain boundary sliding, hall-petch relationship, high-pressure torsion, superplasticity
Kawasaki, Megumi
944ba471-eb78-46db-bfb7-3f0296d9ef6d
Figueiredo, Roberto B.
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Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Kawasaki, Megumi
944ba471-eb78-46db-bfb7-3f0296d9ef6d
Figueiredo, Roberto B.
2e0060b8-6368-4d87-825a-c3cb90e92145
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Kawasaki, Megumi, Figueiredo, Roberto B. and Langdon, Terence G.
(2023)
The role of grain size in the mechanical properties of metals.
Solid State Phenomena.
(In Press)
Abstract
It is now well established that the grain size is the fundamental microstructural feature of all polycrystalline materials. In practice, a very wide range of grain sizes will be needed in order to fully evaluate the effect of grain size on the mechanical properties of metals. For many years this was a significant limitation because it was not possible to use conventional thermomechanical processing
to produce materials with submicrometer or nanometer grain sizes. Recently, this problem has been addressed by developing alternative processing techniques based on the application of severe plastic deformation. This overview demonstrates that, although the flow stress increases with decreasing
grain size at low temperatures and decreases with decreasing grain size at high temperatures, this clear dichotomy in behavior may be adequately explained by using a single theoretical flow mechanism
based on the occurrence of grain boundary sliding.
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Accepted/In Press date: 28 August 2023
Keywords:
equal-channel angular pressing, grain boundary sliding, hall-petch relationship, high-pressure torsion, superplasticity
Identifiers
Local EPrints ID: 485582
URI: http://eprints.soton.ac.uk/id/eprint/485582
PURE UUID: 87c6fb2c-3ada-4138-8c83-3a04920025e9
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Date deposited: 11 Dec 2023 17:36
Last modified: 18 Mar 2024 02:56
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Contributors
Author:
Megumi Kawasaki
Author:
Roberto B. Figueiredo
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