Microstructure and Mechanical Properties of ZK60 Magnesium Alloy Prepared by Multi-Pass Friction Stir Processing


Article Preview

Friction stir processing (FSP) is a novel severe plastic deformation technique developed in recent years to produce fine-grained structural materials. In this paper, the microstructure and mechanical properties of ZK60 magnesium alloy prepared by the single-pass and two-pass FSP were studied. The first-pass was subjected with 800r/min-100mm/min and the second-pass was subjected with 600r/min-100mm/min. The results show that the coarse second phase was dissolved into magnesium matrix and the α-Mg grains were remarkably refined in stir zone after FSP. The average grain sizes of the single-pass and two-pass FSP alloys were 6.8μm and 6.0μm respectively. The microhardnesses of the specimens were 70HV and 65HV, the ultimate tensile strengths were 276MPa and 272MPa, and the elongations were 31.6% and 42.5%, respectively. Through increasing the processing pass, the microstructure became finer and the second phase is dissolved more thoroughly. The combined effect of grain refinement and second phase dissolved was responsible for the change of mechanical properties.



Edited by:

Yafang Han




J. Lin et al., "Microstructure and Mechanical Properties of ZK60 Magnesium Alloy Prepared by Multi-Pass Friction Stir Processing", Materials Science Forum, Vol. 898, pp. 278-283, 2017

Online since:

June 2017




* - Corresponding Author

[1] B. L. Mordike, T. Ebert, Magnesium - Properties - applications - potential, Mater. Sci. Eng. A 302 (2001) 37-45.

[2] H. Furuya, N. Kogiso, S. Matunaga, et al., Applications of magnesium alloys for aerospace structure systems, Mater. Sci. Forum 350 (2000) 341-348.

DOI: 10.4028/www.scientific.net/msf.350-351.341

[3] M. K. Kulekci, Magnesium and its alloys applications in automotive industry, Int. J. Adv. Manuf. Tech. 39 (2008) 851-865.

DOI: 10.1007/s00170-007-1279-2

[4] H. Tsai, C. Liao, F. Chen, Die design for stamping a notebook case with magnesium alloy sheets, J. Mater. Process. Technol. 201 (2008) 247-251.

DOI: 10.1016/j.jmatprotec.2007.11.288

[5] N. Stanford, M. R. Barnett, The origin of rare earth, texture development in extruded Mg-based alloys and its effect on tensile ductility, Mater. Sci. Eng. A 496 (2008) 399-408.

DOI: 10.1016/j.msea.2008.05.045

[6] S. S. Park, W. J. Park, C. H. Kim, et al., The Twin-Roll Casting of Magnesium Alloys, JOM 61 (2009) 14-18.

DOI: 10.1007/s11837-009-0114-7

[7] Y. He, Q. Pan, Y. Qin, et al., Microstructure and mechanical properties of ZK60 alloy processed by two-step equal channel angular pressing, J. Alloys Compd. 492 (2010) 605-610.

DOI: 10.1016/j.jallcom.2009.11.192

[8] R. S. Mishra, Z. Y. Ma, Friction stir welding and processing, Mater. Sci. Eng. R 50 (2005) 1-78.

[9] Q. Yang, A. H. Feng, B. L. Xiao, et al., Influence of texture on superplastic behavior of friction stir processed ZK60 magnesium alloy, Mater. Sci. Eng. A 556 (2012) 671-677.

DOI: 10.1016/j.msea.2012.07.046

[10] S. Mironov, Y. Motohashi, R. Kaibyshev, et al., Development of Fine-Grained Structure Caused by Friction Stir Welding Process of a ZK60A Magnesium Alloy, Mater. Trans. 50 (2009) 610-617.

DOI: 10.2320/matertrans.mra2008192

[11] B. Mansoor, A. K. Ghosh, Microstructure and tensile behavior of a friction stir processed magnesium alloy, Acta. Mater. 60 (2012) 5079-5088.

DOI: 10.1016/j.actamat.2012.06.029

[12] K. Nakata, Y. G. Kim, H. Fujii, et al., Improvement of mechanical properties of aluminum die casting alloy by multi-pass friction stir processing, Mater. Sci. Eng. A 437 (2006) 274-280.

DOI: 10.1016/j.msea.2006.07.150

[13] W. Wang, K. Wang, Q. Guo, et al., Effect of Friction Stir Processing on Microstructure and Mechanical Properties of Cast AZ31 Magnesium Alloy, Rare Metal Mat. Eng. 41 (2012) 1522-1526.

DOI: 10.1016/s1875-5372(13)60004-1

[14] A. H. Feng, Z. Y. Ma, Enhanced mechanical properties of Mg–Al–Zn cast alloy via friction stir processing, Scripta Mater. 56 (2007) 397-400.

DOI: 10.1016/j.scriptamat.2006.10.035

[15] Z. L. Lu, D. T. Zhang, Microstructure and Mechanical Properties of a Fine-Grained AZ91 Magnesium Alloy Prepared by Multi-Pass Friction Stir Processing, Mater. Sci. Forum 850 (2016) 778-783.

DOI: 10.4028/www.scientific.net/msf.850.778

[16] C. I. Chang, C. J. Lee, J. C. Huang, Relationship between grain size and Zener–Holloman parameter during friction stir processing in AZ31 Mg alloys, Scripta Mater. 51 (2004) 509-514.

DOI: 10.1016/j.scriptamat.2004.05.043

Fetching data from Crossref.
This may take some time to load.