CYCLIC PLASTIC BEHAVIOR AND FATGIUE LIFE OF AZ91 ALLOY IN AS-CAST AND ULTRAFINE-GRAINED STATE

Stanislava Fintová, Ludvík Kunz

Abstract


Fatigue properties of magnesium alloy AZ91 in as-cast and in ultrafine-grained state prepared by equal channel angular pressing were investigated. The fatigue strength in the low-cycle fatigue region was found to be substantially improved by the severe plastic deformation, whereas the improvement in the high-cycle fatigue region is negligible. The cyclic plastic response in both states is qualitatively similar; short initial softening is followed by a long cyclic hardening. The observed fatigue behavior was discussed in terms of specific microstructural features of both states and on the basis of cyclic slip localization and fatigue crack initiation.

 


Keywords


AZ91; ECAP; bimodal structure; fatigue; plastic deformation; crack initiation

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References


H. Altwicker et al.: Magnesium und seine Legierungen, J. Springer Verlag, Berlin, 1939.

A. Němcová, J. Zapletal, M. Juliš, T. Podrábský: Mat. Eng. Vol. 16 (4) (2009) 5-10.

M. Bukovina, V. Škorík, B. Hadzima: In: TRANSCOM 2009: 8 th European Conference of

Young Research and Science Workers in Transport and Telecommunications. University of Žilina, 2009, pp. 37-42.

G. Eisenmeier, B. Holzwarth, H.W. Höppel, H. Mughrabi: Mat. Sci. Eng. A319-321 (2001) 578-582.

C.W. Chung, R.G. Ding, Y.L. Chiu, W. Gao: J. Phys.: Conf. Ser. 241 (2010) 012101.

B. Ebel-Wolf, F. Walther, D. Eifler: Mat. Sci. and Eng. A 486 (2008) 634-640.

C.W. Chung, R.G. Ding, Y.L. Chiu, M.A. Hodgson, W. Gao: IOP Conf. Series: Mat. Sci. and Eng. 4 (2009) doi:10.1088/1757-899X/4/1/012012.

B. Hadzima, M. Janeček, P. Suchý, J. Müller, L. Wagner: Mat. Sci. Forum 584-586 (2008) 994-999.

B. L. Mordike, T. Ebert: Mat. Sci. Eng. A302 (2001) 37-45.

K.N. Braszczyńska-Malik, Precipitates of γ–Mg17Al12 Phase in AZ91 Alloy, In: http://cdn.intechopen.com/pdfs/12741/InTech-Precipitates_of_gamma_mg17al12_phase_in_mg_al_alloys.pdf

B. Chen, D.L. Lin, L. Jin, X.Q. Zeng, Ch. Lu: Mat. Sci. Eng. A483-484 (2008) 113-116.

B. Wolf, C. Fleck, D. Eifler.: Int. J. Fat 26 (2007) 1357-1363.

J. Gubicza, K. Máthis, Z. Hege: J. of Alloys and Compounds 492 (2010) 166-172.


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Copyright (c) 2014 Stanislava Fintová, Ludvík Kunz

License URL: http://creativecommons.org/licenses/by-nc-nd/3.0/

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