The Fatigue Crack Propagation of Al–Mg–Mn–Zr Alloy with Erbium

Abstract:

This study investigated the fatigue crack propagation of Al–Mg–Mn–Zr alloys with erbium. The research found that in this alloy the crack propagation path prefers to extend along the grain boundary. If there are too many second phases or impurities in the gain boundary, the crack propagation will be influenced. The dispersed Al₃(Er, Zr) precipitate in the alloy can act as a core of heterogeneous nucleation to attract Mg, Zn and Al element, and reduce the large brittle Al₃Mg₂ second phase appear on the grain boundary, so the fatigue crack propagation rate can be slow down. In addition, these Al₃(Er, Zr) precipitate can pin the dislocation in the alloy to reduce stress concentration at the grain boundary, so it also has some positive effect to the fatigue crack propagation.

• Periodical: Advanced Materials Research (Volumes 1120-1121)
• Pages: 1083-1088
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1120-1121.1083
• Online since: July 2015
• Authors: Xin Lei, Hui Huang, Huan Wang
• Keywords: Aluminium Alloy, Erbium, Fatigue Crack Propagation, Precipitation

References

[1] M. Popović, E. Romhanji, Stress corrosion cracking susceptibility of Al–Mg alloy sheet with high Mg content, J Mater Process Tech. 125 (2002) 275–280.

DOI: 10.1016/s0924-0136(02)00398-9

[2] R.R. Sawtell, J.W. Morris, Dispersion Strengthened Aluminum Alloys, TMS Publishing (1988) 40–49.

[3] C.B. Fuller, D.N. Seidman, D.C. Dunand, Mechanical properties of Al(Sc, Zr) alloys at ambient and elevated temperatures, Acta Mater. 51 (2003) 4803-3814.

DOI: 10.1016/s1359-6454(03)00320-3

[4] Z.M. Yin, Q.L. Pan, Y.H. Zhang, Effect of minor Sc and Zr on the microstructure and mechanical properties of Al–Mg based alloys, Mater. Sci. Eng. A 280 (2000) 151-155.

DOI: 10.1016/s0921-5093(99)00682-6

[5] A.R. Karnesky, M.E. van Dalen, D.C. Dunand, Effects of substituting rare-earth elements for scandium in a precipitation-strengthened Al–0. 08 at. %Sc alloy, Scr. Mater. 55 (2006) 437–440.

DOI: 10.1016/j.scriptamat.2006.05.021

[6] S. Lee, A. Utsunomiya, H. Akamatsu, Influence of scandium and zirconium on grain stability and superplastic ductilities in ultrafine-grained Al–Mg alloys, Acta Mater. 50 (2002) 553–564.

DOI: 10.1016/s1359-6454(01)00368-8

[7] Z.X. Liu, Z.J. Li, M.X. Wang, Effect of complex alloying of Sc, Zr and Ti on the microstructure and mechanical properties of Al–5Mg alloys, Mater. Sci. Eng. A 483–484 (2008) 120–122.

DOI: 10.1016/j.msea.2006.09.166

[8] J.D. Robson, A new model for prediction of dispersoid precipitation in aluminium alloys containing zirconium and scandium, Acta Mater. 52 (2004) 1409-1421.

DOI: 10.1016/j.actamat.2003.11.023

[9] Y.W. Riddle, T.H. Sanders, Mater. Sci. Forum 331–337 (2000) 799-801.

[10] E. Clouet, A. Barbu, Using cluster dynamics to model electrical resistivity measurements in precipitating AlSc alloys, Acta Mater. 55 (2007) 391-400.

DOI: 10.1016/j.actamat.2006.08.021

[11] K.L. Kendig, D.B. Miracle, Strengthening mechanisms of an Al-Mg-Sc-Zr alloy, Acta Mater. 50 (2002) 4165–4175.

DOI: 10.1016/s1359-6454(02)00258-6

[12] M.J. Li, Q.L. Pan, Y.J. Shi, Microstructure dependent fatigue crack growth in Al–Mg–Sc alloy, Mater. Sci. Eng. A 611 (2014) 142–151.

DOI: 10.1016/j.msea.2014.05.087

[13] C.B. Fuller, A.R. Krause, D.C. Dunand, Microstructure and mechanical properties of a 5754 aluminum alloy modified by Sc and Zr additions, Mater. Sci. Eng. A 338 (2002) 8–16.

DOI: 10.1016/s0921-5093(02)00056-4

[14] Y. Zhang, K.Y. Gao, S.P. Wen, The study on the coarsening process and precipitation strengthening of Al3Er precipitate in Al–Er binary alloy, J. Alloy Compd. 610 (2014) 27-34.

DOI: 10.1016/j.jallcom.2014.04.093

[15] D. X Yang, X. Y Li, D. Y He, Study on microstructure and mechanical properties of Al–Mg–Mn–Er alloy joints welded by TIG and laser beam, Mater. Design, 40 (2012) 117-123.

DOI: 10.1016/j.matdes.2012.03.041

[16] S.P. Wen, Z.B. Xing, H. Huang, The effect of erbium on the microstructure and mechanical properties of Al–Mg–Mn–Zr alloy, Mater. Sci. Eng. A 516 (2009) 42–49.

DOI: 10.1016/j.msea.2009.02.045

[17] Z.H. Gao, H.Y. Li, Y.Q. Lai, Effects of minor Zr and Er on microstructure and mechanical properties of pure aluminum, Mater. Sci. Eng. A 580 (2013) 92–98.

DOI: 10.1016/j.msea.2013.05.035

[18] S.P. Wen, K.Y. Gao, Y. Li, Synergetic effect of Er and Zr on the precipitation hardening of Al–Er–Zr alloy, Scr. Mater. 65 (2011) 592-595.

DOI: 10.1016/j.scriptamat.2011.06.033

[19] H.Y. Li, Z.H. Gao, H. Yin, Effects of Er and Zr additions on precipitation and recrystallization of pure aluminum, Scr. Mater. 68 (2013) 59–62.

DOI: 10.1016/j.scriptamat.2012.09.026

[20] D.X. Yang, X.Y. Li, D.Y. He, Effect of minor Er and Zr on microstructure and mechanical properties of Al–Mg–Mn alloy (5083) welded joints, Mater. Sci. Eng. A 561 (2013) 226–231.

DOI: 10.1016/j.msea.2012.11.002

[21] S. Bai, Z.Y. Liu, Y.X. Gu, Microstructures and fatigue fracture behavior of an Al–Cu–Mg–Ag alloy with a low Cu/Mg ratio, Mater. Sci. Eng. A 530 (2011) 473–480.

DOI: 10.1016/j.msea.2011.10.004

[22] R.A. Karnesky, D.C. Dunand, D.N. Seidman, Evolution of nanoscale precipitates in Al microalloyed with Sc and Er, Acta Mater. 57 (2009) 4022-4031.

DOI: 10.1016/j.actamat.2009.04.034

[23] A. Tolley, V. Radmilovic, U. Dahmen, Segregation in Al3(Sc, Zr) precipitates in Al–Sc–Zr alloys, Scr. Mater. 52 (2005) 529–532.

DOI: 10.1016/j.scriptamat.2004.11.021