Skip to main content Accessibility help
×
Home

Microstructure and strengthening mechanism of die-cast Mg–Gd based alloys

  • Qiuming Peng (a1), Lidong Wang (a2), Yaoming Wu (a2) and Limin Wang (a2)

Abstract

Mg–8Gd–2Y–Nd–0.3Zn (wt%) alloy was prepared by the high pressure die-cast technique. The microstructure, mechanical properties in the temperature range from room temperature to 573 K, and strengthening mechanism were investigated. It was confirmed that the Mg–Gd-based alloy with high Gd content exhibited outstanding die-cast character. The die-cast alloy was mainly composed of small cellular equiaxed dendrites and the matrix. The long lamellar-shaped stacking compound of Mg3X (X: Gd, Y, Nd, and Zn) and polygon-shaped precipitate of Mg5RE (RE: Gd, Y, and Nd) were mainly concentrated along the dendrite boundaries. Meanwhile, it was demonstrated that the Zn addition affects the formation of non-equilibrium precipitate Mg3X. The ultimate tensile strength, yield strength, and Young’s modulus were 302 MPa, 267 MPa, and 38 GPa at room temperature, respectively. The outstanding mechanical properties were mainly attributed to the small dendrite spacing, wide skin region, and some dispersed precipitates in the alloy formed by the high-pressure die-cast technique. Designing a novel die-cast Mg alloy with good heat resistance without Al element is a significant accomplishment.

Copyright

Corresponding author

a)Address all correspondence to this author. e-mail: lmwang@ciac.jl.cn

References

Hide All
1Bettles, C.J.Gibson, M.A.: Microstructure design for enhanced elevated temperature properties in sand-castable magnesium alloys. Adv. Eng. Mater. 5, 859 2003
2Lee, S.G., Patel, G.R., Gokhale, A.M., Sreeranganathan, A.Horstemeyer, M.F.: Variability in the tensile ductility of high-pressure die-cast AM50 Mg-alloy. Scripta Mater. 53, 851 2005
3Wang, Y., Liu, G.Fan, Z.: Microstructural evolution of rheo-diecast AZ91D magnesium alloy during heat treatment. Acta Mater. 54, 689 2006
4Moreno, I.P., Nandy, T.K., Jones, J.W., Allison, J.E.Pollock, T.M.: Microstructural characterization of a die-cast magnesium-rare earth alloy. Scripta Mater. 45, 1423 2001
5Bakke, P.Westengen, H.: Die casting for high performance-focus on alloy development. Adv. Eng. Mater. 5, 879 2003
6Anyanwu, I.A., Kamado, S.Kojima, Y.: Creep properties of Mg–Gd–Y–Zr alloys. Mater. Trans. 42, 1212 2001
7Apps, P.J., Karimzadeh, H., King, J.F.Lorimer, G.W.: Precipitation reactions in magnesium-rare earth alloys containing yttrium, gadolinium, or dysprosium. Scripta Mater. 48, 1023 2003
8Peng, Q.M., Wang, J.L., Wu, Y.M.Wang, L.M.: Microstructures and tensile properties of Mg–8Gd–0.6Zr–xNd–yY (x + y = 3, mass%) alloys. Mater. Sci. Eng., A 433, 133 2006
9Stulíková, I., Smola, B., von Buch, F.Mordike, B.L.: Development of creep resistant Mg–Gd–Sc alloys with low Sc content. Mat.-wiss. Werkstofftech. 20–24, 32 2001
10Yamada, K., Okubo, Y., Shiono, M., Watanabe, H., Kamado, S.Kojima, Y.: Alloy development of high toughness Mg– Gd–Y–Zn–Zr alloys. Mater. Trans. 47, 1066 2006
11Abe, E., Kawamura, Y., Hayashi, Y.Inoue, A.: Long-period ordered structure in a high-strength nanocrystalline Mg–1 at.% Zn–2 at.% Y alloy studied by atomic-resolution Z-contrast STEM. Acta Mater. 50, 3845 2002
12Yamasaki, W., Anan, T., Yashimoto, S.Kawamura, Y.: Mechanical properties of warm-extruded Mg–Zn–Gd alloy with coherent 14H long periodic stacking ordered structure precipitate. Scripta Mater. 53, 799 2005
13Weiler, J.P., Wood, J.T., Klassen, R.J., Berkmortel, R.Wang, G.: Variability of skin thickness in an AM60B magnesium alloy die-casting. Mater. Sci. Eng., A 419, 297 2006
14Laukli, H.I., Gourlay, C.M., Dahle, A.K.Lohne, O.: Effects of Si content on defect band formation in hypoeutectic Al–Si die castings. Mater. Sci. Eng., A 413–414, 92 2005
15Dahle, A.K., Sanne, S., St.John, D.H.Westengen, H.: Formation of defect bands in high pressure die cast magnesium. J. Light Metal. 1, 99 2001
16Mccormark, P.D.Crane, L.: Physical Fluid Dynamics Academic Press New York 1973
17Quested, T.E., Dinsdale, A.T.Greer, A.L.: Thermodynamic modelling of growth-restriction effects in aluminium alloys. Acta Mater. 53, 1323 2005
18William, D.Callister, J.Fundamentals of Materials Science and Engineering John Wiley & Sons 2001

Keywords

Microstructure and strengthening mechanism of die-cast Mg–Gd based alloys

  • Qiuming Peng (a1), Lidong Wang (a2), Yaoming Wu (a2) and Limin Wang (a2)

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed