Compressive deformation behavior of an indirect-extruded Mg-8Sn-1Al-1Zn alloy

Abstract

The medium and warm deformation behaviors of an indirect-extruded Mg-8Sn-1Al-1Zn alloy were investigated by compression tests at temperatures between 298 and 523 K and strain rates of 0.001–10 s⁻¹. It was found that the twinning-slip transition temperature was strain rate dependent, and all the true stress-true strain curves could be divided into two groups: concave and convex curves. Associated microstructural investigations indicated that the dynamic recrystallization (DRX) behavior of the alloy varied with deformation conditions. At high strain rate and low temperature, dynamically recrystallized grains preferentially nucleated and developed in the twinned regions, indicating that twinning-induced DRX was dominant. While, at low strain rate, DRX developed extensively at grain boundaries and twins, and the process of twinning contributed to both oriented nucleation and selective growth. For the studied alloy, cracks mainly initiated from the shear band and twinning lamellar over the ranges of temperature and strain rate currently applied.

Keywords

magnesium alloys / compression testing / dynamic recrystallization / microstructure

References

[1] Kang D.H., Park S.S., Kim N.J. Development of creep resistant die cast Mg-Sn-Al-Si alloy. Mater. Sci. Eng. A, 2005, 413–414(1): 555.

[2] Mendis C.L., Bettles C.J., Gibson M.A., Hutchinson C.R. An enhanced age hardening response in Mg-Sn based alloys containing Zn. Mater. Sci. Eng. A, 2006, 435–436(1–2): 163.

[3] Liu H.M., Chen Y.G., Tang Y.B., Wei S.H., Niu G. The microstructure, tensile properties, and creep behavior of as-cast Mg-(1–10)%Sn alloys. J. Alloys Compd., 2007, 440(1–2): 122.

[4] Wei S.H., Chen Y.G., Tang Y.B., Liu H.M., Xiao S.F., Niu G., Zhang X.P., Zhao Y.H. Compressive creep behavior of as-cast and aging-treated Mg-5wt% Sn alloys. Mater. Sci. Eng. A, 2008, 492(1–2): 20.

[5] Gibson M.A., Fang X., Bettles C.J., Hutchinson C.R. The effect of precipitate state on the creep resistance of Mg-Sn alloys. Scripta Mater., 2010, 63(8): 899.

[6] Park S.S., Tang W.N., You B.S. Microstructure and mechanical properties of an indirect-extruded Mg-8Sn-1Al-1Zn alloy. Mater. Lett., 2010, 64(1): 31.

[7] Sasaki T.T., Yamamoto K., Honma T., Kamado S., Hono K. A high-strength Mg-Sn-Zn-Al alloy extruded at low temperature. Scripta Mater., 2008, 59(10): 1111.

[8] Cheng W.L., Park S.S., You B.S., Koo B.H. Microstructure and mechanical properties of binary Mg-Sn alloys subjected to indirect extrusion. Mater. Sci. Eng. A, 2010, 527(18–19): 4650.

[9] Yu K., Li W.X., Zhao J., Ma Z.Q., Wang R. Plastic deformation behaviors of a Mg-Ce-Zn-Zr alloy. Scripta Mater., 2003, 48(9): 1319.

[10] Wang S.R., Wang M., Ma R., Wang Y., Wang Y.J. Microstructure and hot compression behavior of twin-roll-casting magnesium alloy AZ41M. Rare Met., 2010, 29(4): 396.

[11] Zhang Y., Zeng X.Q., Lu C., Ding W.J. Deformation behavior and dynamic recrystallization of a Mg-Zn-Y-Zr alloy. Mater. Sci. Eng. A, 2006, 428(1–2): 91.

[12] Li D.J., Wang Q.D., Blandin J.J., Suery M., Dong J., Zeng X.Q. High temperature compressive deformation behavior of an extruded Mg-8Gd-3Y-0.5Zr (wt%) alloy. Mater. Sci. Eng. A, 2009, 526(1–2): 150.

[13] Rao K.P., Prasad Y.V.R.K., Hort N., Kainer K.U. Hot workability characteristics of cast and homogenized Mg-3Sn-1Ca alloy. J. Mater. Process. Technol., 2008, 201(1–3): 359.

[14] Prasad Y.V.R.K., Rao K.P., Hort N., Kainer K.U. Optimum parameters and rate-controlling mechanisms for hot working of extruded Mg-3Sn-1Ca alloy. Mater. Sci. Eng. A, 2009, 502(1–2): 25.

[15] Park S.S., Kim Y.J., Cheng W.L., Kim Y.M., You B.S. Tensile properties of extruded Mg-8Sn-1Zn alloys subjected to different heat treatments. Philos. Mag. Lett., 2011, 91(1): 35.

[16] Beladi H., Barnett M.R. Influence of aging pre-treatment on the compressive deformation of WE54 alloy. Mater. Sci. Eng. A, 2007, 452–453(1–2): 306.

[17] Liu C.M., Liu Z.J., Zhu X.R., Zhou H.T. Research and development of dynamic recrystallization in pure magnesium and its alloys. Chin. J. Nonferrous Met., 2006, 16(1): 1.

[18] Lou Y., Li L.X., Zhou J., Na L. Deformation behavior of Mg-8Al magnesium alloy compressed at medium and high temperatures. Mater. Charact., 2011, 62(3): 346.

[19] Ion S.E., Humphreys F.J., White S.H. Dynamic recrystallisation and the development of microstructure during the high temperature deformation of magnesium. Acta Metall., 1982, 30(10): 1909.

[20] McQueen H.J., Ryan N.D. Constitutive analysis in hot working. Mater. Sci. Eng. A, 2002, 322(1–2): 43.

[21] Mwembela A., Konopleva E.B., Mcqueen H.J. Microstructural development in Mg alloy AZ31 during hot working. Scripta Mater., 1997, 37(11): 1789.

[22] Zhang H., Li L.X., Yuan D., Peng D.S. Hot deformation behavior of the new Al-Mg-Si-Cu aluminum alloy during compression at elevated temperatures. Mater. Charact., 2007, 58(2): 168.

[23] Spigarelli S., El. Mehtedi M., Cabibbo M., Evangelista E., Kaneko J., Jäger A., Gartnerova V. Analysis of high-temperature deformation and microstructure of an AZ31 magnesium alloy. Mater. Sci. Eng. A, 2007, 462(1–2): 197.

[24] Robson J.D., Henry D.T., Davis B. Particle effects on recrystallization in magnesium-manganese alloys: Particle-stimulated nucleation. Acta Mater., 2009, 57(9): 2739.