Deformation Mechanisms in Ultrafine-Grained Zn at Different Strain Rates and Temperatures

Péter Jenei; Guy Dirras; Jenő Gubicza; Hervé Couque

doi:10.4028/www.scientific.net/KEM.592-593.313

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HomeKey Engineering MaterialsKey Engineering Materials Vols. 592-593Deformation Mechanisms in Ultrafine-Grained Zn at...

Deformation Mechanisms in Ultrafine-Grained Zn at Different Strain Rates and Temperatures

Abstract:

The deformation mechanisms in ultrafine-grained hexagonal close packed Zn were investigated at different strain rates and temperatures. The influence of grain size on the deformation mechanisms was revealed by comparing the results obtained on ultrafine-grained and coarse-grained Zn. It was found that for coarse-grained Zn at room temperature and strain rates lower than 10^-2 s^-1twinning contributed to plasticity besides dislocation activity. For strain rates higher than 10³ s^-1 the plasticity in coarse-grained Zn was controlled by dislocation drag. In ultrafine-grained Zn the relatively large dislocation density (~10¹⁴ m^-2) and the small grain size (~250 nm) limit the dislocation velocity yielding the lack of dislocation drag effects up to 10⁴ s^-1. For ultrafine-grained Zn, twinning was not observed in the entire strain rate range due to its very small grain size. During room temperature compression at strain rates higher than 0.35 s^-1 and in high temperature creep deformation of ultrafine-grained Zn besides prismatic and pyramidal <c+a> dislocations observed in the initial state, <a>-type basal and pyramidal dislocations as well as other <c+a>-type pyramidal dislocations were formed.

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Key Engineering Materials (Volumes 592-593)

Pages:

313-316

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.592-593.313

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Online since:

November 2013

Authors:

Péter Jenei, Guy Dirras, Jenő Gubicza, Hervé Couque

Keywords:

Twinning, Dynamic Compression, Indentation Creep, Polycrystalline Zn, Strain Rate Sensitivity, Ultrafine Grain

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References

[1] H.J. Frost and M.F. Ashby: Deformation-mechanism maps (Pergamon Press, Oxford, New York, 1982).

Google Scholar

[2] H. Couque and R. Boulanger, in: Proceedings of the 23rd International Symposiumon Ballistics, edited by F. Gáalves and V. Sanchez-Galves, Tarragona, Spain (2007), p.255.

Google Scholar

[3] H. Li, Q.Q. Duan, X.W. Li and Z.F. Zhang: Mater. Sci. Eng. A Vol. 466 (2007), p.38.

Google Scholar

[4] G. Dirras, J. Gubicza, H. Couque, A. Ouarem and P. Jenei: Mater. Sci. Eng. A Vol. 564 (2013), p.273.

Google Scholar

[5] X. Zhang, H. Wang, R.O. Scattergood, J. Narayan, C.C. Koch, A.V. Sergueeva and A.K. Mukherjee: Acta Mater. Vol. 50 (2002), p.4823.

DOI: 10.1016/s1359-6454(02)00349-x

Google Scholar

[6] K. Máthis, K. Nyilas, A. Axt, I.C. Dragomir, T. Ungár and P. Lukác: Acta. Mater. Vol. 52 (2004), p.2889.

Google Scholar

[7] G. Cseh, N.Q. Chinh, P. Tasnádi and A. Juhász: J. Mater. Sci. Vol. 32 (1997), p.5107.

Google Scholar