The background to superplastic forming and opportunities arising from new developments
The background to superplastic forming and opportunities arising from new developments
The occurrence of superplastic flow in metals has a long history but it is only over the last three or four decades that it was recognized that this process provides an opportunity for fabricating complex parts, especially curved panels, that may be used in a wide range of industrial applications. In practice, this use is dependent upon the high strain rate sensitivity of ~0.5 which is an inherent feature of true superplastic flow but in practice excellent forming may be achieved also through the use of metals deforming within the range of dislocation glide where the strain rate sensitivity is close to 0.3. New possibilities have arisen over the last two decades with the demonstrations that exceptionally refined microstructures, usually within the submicrometer or even the nanometer range, may be prepared from a wide range of commercial alloys through the application of severe plastic deformation in which the material is subjected to a very high strain without any significant changes in the overall dimensions of the sample. This presentation examines these historical developments and describes the new processing procedures that provide new opportunities within the field of superplastic forming.
Ductility, Severe Plastic Deformation,, Strain Rate Sensitivity,, Superplastic Forming,, Ultrafine-Grained Materials.
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Langdon, Terence G
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Langdon, Terence G
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Abstract
The occurrence of superplastic flow in metals has a long history but it is only over the last three or four decades that it was recognized that this process provides an opportunity for fabricating complex parts, especially curved panels, that may be used in a wide range of industrial applications. In practice, this use is dependent upon the high strain rate sensitivity of ~0.5 which is an inherent feature of true superplastic flow but in practice excellent forming may be achieved also through the use of metals deforming within the range of dislocation glide where the strain rate sensitivity is close to 0.3. New possibilities have arisen over the last two decades with the demonstrations that exceptionally refined microstructures, usually within the submicrometer or even the nanometer range, may be prepared from a wide range of commercial alloys through the application of severe plastic deformation in which the material is subjected to a very high strain without any significant changes in the overall dimensions of the sample. This presentation examines these historical developments and describes the new processing procedures that provide new opportunities within the field of superplastic forming.
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2020-SSP-Langdon-306-1
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Accepted/In Press date: 17 December 2019
Keywords:
Ductility, Severe Plastic Deformation,, Strain Rate Sensitivity,, Superplastic Forming,, Ultrafine-Grained Materials.
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Local EPrints ID: 442195
URI: http://eprints.soton.ac.uk/id/eprint/442195
PURE UUID: 622ff838-ae8f-452b-8a8e-c56a534b8ef9
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Date deposited: 08 Jul 2020 16:31
Last modified: 17 Mar 2024 02:55
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