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Licensed Unlicensed Requires Authentication Published by De Gruyter March 1, 2013

Modelling of work-hardening behaviour for laser welded magnesium alloy

  • X. Cao , M. Jahazi , H. Al-Kazzaz and M. Medraj


To investigate the reliability of the laser welding process for the magnesium alloy ZE41A-T5, eight butt joints were welded using the same processing parameters. These joints were tensile tested in the as-welded and aged conditions and the tensile data were analyzed from work-hardening characteristics. The flow curves cannot entirely be satisfactorily described by the Kocks–Mecking model; however, the model is still applicable to the high strain zone of the flow curves where work-hardening rate decreases linearly with flow stress. The reproducibility of the initial work-hardening rate and saturation stress is statistically analyzed. The initial work-hardening rates for the base castings and welded joints vary from approximately 4000 to 7000 MPa, i. e. 1/4 to 1/3 of the base material shear modulus. The as-welded joints have slightly higher initial work-hardening rates than the base castings. Artificial aging produces lower initial work-hardening rates compared with the base material. The saturation stress ranges approximately from 260 to 320 MPa, i. e. about 2 % of the shear modulus. The saturation stress for the welded joints is lower than that for the base material. Compared with the as-weld joints, aging decreases initial work-hardening rate but slightly increases saturation stress. Both initial work-hardening rate and saturation stress become more scattered after aging.

1 Correspondence address: Dr. Xinjin Cao, Research Officer, Aerospace Manufacturing Technology Center, Institute for Aerospace Research, National Research Council Canada, 5145 Decelles Avenue, Montreal, Quebec, Canada, H3T 2B2, Tel.: +1 514 283 9047, Fax: +1 514 283 9445. E-mail:


[1] G.E.Dieter: Mechanical Metallurgy, 3rd Ed., McGraw-Hill Book Company, New York(1986).Search in Google Scholar

[2] U.F.Kocks, H.Mecking: Prog. Mater. Sci.48(2003)171.10.1016/S0079-6425(02)00003-8Search in Google Scholar

[3] E.Nes: Prog. Mater. Sci.41(1998)129.10.1016/S0079-6425(97)00032-7Search in Google Scholar

[4] E.Voce: J. Inst. Met.74(1948)537.Search in Google Scholar

[5] E.Voce: Metallurgia51(1955)219.10.1515/9783111728681-009Search in Google Scholar

[6] U.F.Kocks: J. Eng. Mater. Tech.98(1976)76.10.1115/1.3443340Search in Google Scholar

[7] N.Tsuchida, Y.Tomota, H.Moriya, O.Umezawa, K.Nagal: Acta Mater.49(2001)3029.10.1016/S1359-6454(01)00197-5Search in Google Scholar

[8] C.G.Shastry, M.D.Mathew, K.B.S.Rao, S.L.Mannan: Int. J. Pressure Vessels Piping81(2004)297.10.1016/j.ijpvp.2003.11.016Search in Google Scholar

[9] M.Tiryakioglu: Mater. Sci. Eng. A427(2006)154.10.1016/j.msea.2006.04.011Search in Google Scholar

[10] M.Tiryakioglu, J.Campbell, J.T.Staley: Mater. Sci. Eng. A368(2004)205.10.1016/j.msea.2003.10.311Search in Google Scholar

[11] J.A.del Valle, F.Carreno, O.A.Ruano, Acta Mater.54(2006)4247.10.1016/j.actamat.2006.05.018Search in Google Scholar

[12] X.Cao, M.Xiao, M.Jahazi, J.P.Immarigeon: Mater. Manufact. Processes20(2005)987.10.1081/AMP-200060436Search in Google Scholar

[13] X.Cao, M.Jahazi, J.P.Immarigeon, W.Wallace: J. Mater. Process. Technol.171(2006)188.10.1016/j.jmatprotec.2005.06.068Search in Google Scholar

[14] H.Al-Kazzaz, X.Cao, M.Jahazi, M.Medraj: Metall. Trans., submitted(2007).Search in Google Scholar

[15] A.D.Rollett, U.F.Kocks, in: Proc. Dislocation-93 Conf., Aussois, France, April 1–9, 1993.10.4028/ in Google Scholar

[16] H.Al-Kazzaz, M.Medraj, X.Cao, M.Jahazi, M.Xiao, in: J.P.Marttin (Ed.), Proc. Int. Symp. on Light Metals, pp. 137–149, COM 2005: 44th Annual Conf. Of Metallurgists of CIM, Calgary, Albert, Canada, Aug. 21–24, 2005.Search in Google Scholar

[17] H.Al-Kazzaz, M.Medraj, X.Cao, M.Jahazi, M.Xiao, in: M.O.Pekgulerguz, L.W.F.Mackenie (Eds.), Magnesium Technology In the Global Age, pp. 503518, COM 2006: 45th Annual Conf. Of Metallurgists of CIM, Montreal, Canada, 1–4 Oct. 2006.Search in Google Scholar

[18] X.He, S.O.Oyadiji: J. Mater. Process. Tech.119(2001)374.10.1016/S0924-0136(01)00938-4Search in Google Scholar

Received: 2007-05-17
Accepted: 2007-05-22
Published Online: 2013-03-01
Published in Print: 2008-02-01

© 2008, Carl Hanser Verlag, Munich

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