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Fracture strength characterization of protective intermetallic coatings on AZ91E Mg alloys using FIB-machined microcantilever bending technique

Published online by Cambridge University Press:  05 May 2015

Mingyuan Lu ,
Hugh Russell  and
Han Huang
Mingyuan Lu
Affiliation:
School of Mechanical and Mining Engineering, Faculty of Engineering, Architecture and Information Technology (EAIT), The University of Queensland, Brisbane, QLD 4072, Australia
Hugh Russell
Affiliation:
School of Mechanical and Mining Engineering, Faculty of Engineering, Architecture and Information Technology (EAIT), The University of Queensland, Brisbane, QLD 4072, Australia
Han Huang*
Affiliation:
School of Mechanical and Mining Engineering, Faculty of Engineering, Architecture and Information Technology (EAIT), The University of Queensland, Brisbane, QLD 4072, Australia
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

The fracture strength of β-Mg17Al12 and τ-Mg32(Al, Zn)49 intermetallic coatings on AZ91E Mg alloy was investigated using a nanoindentation-based microcantilever bending technique. A set of micrometer-sized cantilevers with varying dimensions were machined using focused ion beam milling. A nanoindenter was then used to apply an increasing bending load until each cantilever fractured. The corresponding linear-elastic finite element models were created to simulate the deflection of the cantilevers and the fracture strength σm was derived from the models. The results showed that the fracture occurred at the root of the cantilever where the tensile stresses were highest; the average fracture strengths of the β-Mg17Al12 and τ-Mg32(Al, Zn)49 phases were 1.76 and 1.05 GPa, respectively. The potential sources of error are also discussed.

Keywords

magnesium alloyintermetallicnanoindentationFIB milling
Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 10 , 28 May 2015 , pp. 1678 - 1685
Copyright
Copyright © Materials Research Society 2015 

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References

REFERENCES

Kulekci, M.: Magnesium and its alloys applications in automotive industry. Int. J. Adv. Manuf. Technol. 39(9–10), 851 (2008).CrossRefGoogle Scholar
Song, G. and Atrens, A.: Understanding magnesium corrosion—A framework for improved alloy performance. Adv. Eng. Mater. 5(12), 837 (2003).CrossRefGoogle Scholar
Gray, J.E. and Luan, B.: Protective coatings on magnesium and its alloys—A critical review. J. Alloys Compd. 336(1–2), 88 (2002).CrossRefGoogle Scholar
Hirmke, J., Zhang, M.X., and St John, D.H.: Surface alloying of AZ91E alloy by Al–Zn packed powder diffusion coating. Surf. Coat. Technol. 206(2–3), 425 (2011).Google Scholar
Yang, H., Guo, X., Wu, G., Ding, W., and Birbilis, N.: Electrodeposition of chemically and mechanically protective Al-coatings on AZ91D Mg alloy. Corros. Sci. 53(1), 381 (2011).Google Scholar
He, M., Liu, L., Wu, Y., Tang, Z., and Hu, W.: Improvement of the properties of AZ91D magnesium alloy by treatment with a molten AlCl3–NaCl salt to form an Mg–Al intermetallic surface layer. J. Coat. Technol. Res. 6(3), 407 (2009).Google Scholar
Zhang, M.X., Huang, H., Spencer, K., and Shi, Y.N.: Nanomechanics of Mg–Al intermetallic compounds. Surf. Coat. Technol. 204(14), 2118 (2010).Google Scholar
Sun, H.Q., Shi, Y.N., Zhang, M.X., and Lu, K.: Surface alloying of an Mg alloy subjected to surface mechanical attrition treatment. Surf. Coat. Technol. 202(16), 3947 (2008).Google Scholar
Zhao, M.C., Liu, M., Song, G., and Atrens, A.: Influence of the β-phase morphology on the corrosion of the Mg alloy AZ91. Corros. Sci. 50(7), 1939 (2008).Google Scholar
Song, G., Atrens, A., and Dargusch, M.: Influence of microstructure on the corrosion of diecast AZ91D. Corros. Sci. 41(2), 249 (1998).Google Scholar
Pebere, N., Riera, C., and Dabosi, F.: Investigation of magnesium corrosion in aerated sodium sulfate solution by electrochemical impedance spectroscopy. Electrochim. Acta 35(2), 555 (1990).CrossRefGoogle Scholar
Song, G. and Atrens, A.: Corrosion mechanisms of magnesium alloys. Adv. Eng. Mater. 1(1), 11 (1999).Google Scholar
Zhong, C., Liu, F., Wu, Y., Le, J., Liu, L., He, M., Zhu, J., and Hu, W.: Protective diffusion coatings on magnesium alloys: A review of recent developments. J. Alloys Compd. 520, 11 (2012).Google Scholar
Zhang, M-X. and Kelly, P.M.: Surface alloying of AZ91D alloy by diffusion coating. J. Mater. Res. 17(10), 2477 (2002).CrossRefGoogle Scholar
Hirmke, J., Zhang, M.X., and St John, D.H.: Influence of chemical composition of Mg alloys on surface alloying by diffusion coating. Metall. Mater. Trans. A 43(5), 1621 (2012).CrossRefGoogle Scholar
Chang, H.W., Zhang, M.X., Atrens, A., and Huang, H.: Nanomechanical properties of Mg–Al intermetallic compounds produced by packed powder diffusion coating (PPDC) on the surface of AZ91E. J. Alloys Compd. 587, 527 (2014).Google Scholar
Kamiya, S., Hanyu, H., Amaki, S., and Yanase, H.: Statistical evaluation of the strength of wear-resistant hard coatings. Surf. Coat. Technol. 202(4–7), 1154 (2007).Google Scholar
Cao, Z.Q., Zhang, T.Y., and Zhang, X.: Microbridge testing of plasma-enhanced chemical-vapor deposited silicon oxide films on silicon wafers. J. Appl. Phys. 97(10), 9 (2005).Google Scholar
Weihs, T.P., Hong, S., Bravman, J.C., and Nix, W.D.: Mechanical deflection of cantilever microbeams—A new technique for testing the mechanical-properties of thin-films. J. Mater. Res. 3(5), 931 (1988).Google Scholar
Ericson, F. and Schweitz, J.A.: Micromechanical fracture strength of silicon. J. Appl. Phys. 68(11), 5840 (1990).Google Scholar
McCarthy, J., Pei, Z., Becker, M., and Atteridge, D.: FIB micromachined submicron thickness cantilevers for the study of thin film properties. Thin Solid Films 358(1–2), 146 (2000).Google Scholar
Massl, S., Thomma, W., Keckes, J., and Pippan, R.: Investigation of fracture properties of magnetron-sputtered TiN films by means of a FIB-based cantilever bending technique. Acta Mater. 57(6), 1768 (2009).CrossRefGoogle Scholar
Massl, S., Keckes, J., and Pippan, R.: A new cantilever technique reveals spatial distributions of residual stresses in near-surface structures. Scr. Mater. 59(5), 503 (2008).Google Scholar
Matoy, K., Detzel, T., Müller, M., Motz, C., and Dehm, G.: Interface fracture properties of thin films studied by using the micro-cantilever deflection technique. Surf. Coat. Technol. 204(6–7), 878 (2009).Google Scholar
Di Maio, D. and Roberts, S.G.: Measuring fracture toughness of coatings using focused-ion-beam-machined microbeams. J. Mater. Res. 20(02), 299 (2005).Google Scholar
Oliver, W.C. and Pharr, G.M.: Measurement of hardness and elastic modulus by instrumented indentation: Advances in understanding and refinements to methodology. J. Mater. Res. 19(1), 3 (2004).CrossRefGoogle Scholar
Lawn, B.R.: Fracture of Brittle Solids (Cambridge University Press, New York, NY, 1993).Google Scholar
Johansson, S., Schweitz, J.A., Tenerz, L., and Tiren, J.: Fracture testing of silicon microelement in situ in a scanning electron microscope. J. Appl. Phys. 63(10), 4799 (1988).Google Scholar
Prenitzer, B.I., Urbanik-Shannon, C.A., Giannuzzi, L.A., Brown, S.R., Irwin, R.B., Shofner, T.L., and Stevie, F.A.: The correlation between ion beam/material interactions and practical FIB specimen preparation. Microsc. Microanal. 9(03), 216 (2003).CrossRefGoogle ScholarPubMed