Dynamic response of severe plastic deformation processed 1070 aluminum at various temperatures

V.T Kuokkala, J. Kokkonen, B. Song, W. Chen, L. Olejnik, A. Rosochowski

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

The properties of materials are directly related to their microstructure, one quantitative measure of which is the average grain size. Most of the strength properties of crystalline materials are improved with diminishing grain size, and therefore new technologies have been developed to produce also bulk metals with nanocrystalline or ultrafine grain sizes. In this paper, we report the results of compression experiments on ultrafine-grained 1070 aluminum produced by different routes of equal-channel angular pressing (ECAP). The compression tests were conducted at different strain rates and temperatures using a servo-hydraulic materials testing machine and the Split Hopkinson Pressure bar technique. The results show that both increasing strain rate and decreasing temperature increase the work hardening capability of ultrafine-grained aluminum, thus enhancing the ductility of the material. The strain rate dependence of ultrafine-grained aluminum is also higher than that of the coarse-grained material, which implies that there are also differences in the active deformation mechanisms of these two different types of materials.
Original languageEnglish
Title of host publicationProceedings of the 18th DYMAT Technical Meeting, The Behaviour of Bulk Nanomaterials and Metallic Glasses under Dynamic Loading
Place of PublicationLa Chapelle, France
Number of pages8
Publication statusPublished - 2008

Fingerprint

dynamic response
plastic deformation
strain rate
grain size
aluminum
work hardening
compression tests
pressing
ductility
test equipment
hydraulics
temperature
routes
microstructure
metals

Keywords

  • plastic
  • aluminum
  • temperature
  • ECAP
  • ultrafine-grained
  • 1070 aluminum

Cite this

Kuokkala, V. T., Kokkonen, J., Song, B., Chen, W., Olejnik, L., & Rosochowski, A. (2008). Dynamic response of severe plastic deformation processed 1070 aluminum at various temperatures. In Proceedings of the 18th DYMAT Technical Meeting, The Behaviour of Bulk Nanomaterials and Metallic Glasses under Dynamic Loading La Chapelle, France.
Kuokkala, V.T ; Kokkonen, J. ; Song, B. ; Chen, W. ; Olejnik, L. ; Rosochowski, A. / Dynamic response of severe plastic deformation processed 1070 aluminum at various temperatures. Proceedings of the 18th DYMAT Technical Meeting, The Behaviour of Bulk Nanomaterials and Metallic Glasses under Dynamic Loading. La Chapelle, France, 2008.
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Kuokkala, VT, Kokkonen, J, Song, B, Chen, W, Olejnik, L & Rosochowski, A 2008, Dynamic response of severe plastic deformation processed 1070 aluminum at various temperatures. in Proceedings of the 18th DYMAT Technical Meeting, The Behaviour of Bulk Nanomaterials and Metallic Glasses under Dynamic Loading. La Chapelle, France.

Dynamic response of severe plastic deformation processed 1070 aluminum at various temperatures. / Kuokkala, V.T; Kokkonen, J.; Song, B.; Chen, W.; Olejnik, L.; Rosochowski, A.

Proceedings of the 18th DYMAT Technical Meeting, The Behaviour of Bulk Nanomaterials and Metallic Glasses under Dynamic Loading. La Chapelle, France, 2008.

Research output: Chapter in Book/Report/Conference proceedingChapter

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T1 - Dynamic response of severe plastic deformation processed 1070 aluminum at various temperatures

AU - Kuokkala, V.T

AU - Kokkonen, J.

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AU - Olejnik, L.

AU - Rosochowski, A.

PY - 2008

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N2 - The properties of materials are directly related to their microstructure, one quantitative measure of which is the average grain size. Most of the strength properties of crystalline materials are improved with diminishing grain size, and therefore new technologies have been developed to produce also bulk metals with nanocrystalline or ultrafine grain sizes. In this paper, we report the results of compression experiments on ultrafine-grained 1070 aluminum produced by different routes of equal-channel angular pressing (ECAP). The compression tests were conducted at different strain rates and temperatures using a servo-hydraulic materials testing machine and the Split Hopkinson Pressure bar technique. The results show that both increasing strain rate and decreasing temperature increase the work hardening capability of ultrafine-grained aluminum, thus enhancing the ductility of the material. The strain rate dependence of ultrafine-grained aluminum is also higher than that of the coarse-grained material, which implies that there are also differences in the active deformation mechanisms of these two different types of materials.

AB - The properties of materials are directly related to their microstructure, one quantitative measure of which is the average grain size. Most of the strength properties of crystalline materials are improved with diminishing grain size, and therefore new technologies have been developed to produce also bulk metals with nanocrystalline or ultrafine grain sizes. In this paper, we report the results of compression experiments on ultrafine-grained 1070 aluminum produced by different routes of equal-channel angular pressing (ECAP). The compression tests were conducted at different strain rates and temperatures using a servo-hydraulic materials testing machine and the Split Hopkinson Pressure bar technique. The results show that both increasing strain rate and decreasing temperature increase the work hardening capability of ultrafine-grained aluminum, thus enhancing the ductility of the material. The strain rate dependence of ultrafine-grained aluminum is also higher than that of the coarse-grained material, which implies that there are also differences in the active deformation mechanisms of these two different types of materials.

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KW - temperature

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M3 - Chapter

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BT - Proceedings of the 18th DYMAT Technical Meeting, The Behaviour of Bulk Nanomaterials and Metallic Glasses under Dynamic Loading

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Kuokkala VT, Kokkonen J, Song B, Chen W, Olejnik L, Rosochowski A. Dynamic response of severe plastic deformation processed 1070 aluminum at various temperatures. In Proceedings of the 18th DYMAT Technical Meeting, The Behaviour of Bulk Nanomaterials and Metallic Glasses under Dynamic Loading. La Chapelle, France. 2008