Effect of bending and tension deformation on the texture evolution and stretch formability of Mg-Zn-RE-Zr alloy

Abstract

Bending and tension deformations were performed on Mg-1.3wt%Zn-0.2wt%RE-0.3wt%Zr (ZEK100) alloy sheets that initially had a transverse direction (TD)-split texture. The effects of bending and tension deformations on the texture formation and room-temperature formability of specimens were investigated. The specimen subjected to 3-pass bending and tension deformations exhibited an excellent Erichsen value of 9.6 mm. However, the Erichsen value deterioration was observed in the specimen subjected to 7-pass deformations. The rolling direction-split texture developed on the surface with an increasing pass number of deformations. Conversely, the clear TD-split texture remained at the central part. As a result, a quadrupole texture was macroscopically developed with an increasing pass number of deformations. The reduction in anisotropy by the formation of the quadrupole texture is suggested to be the main reason for the improvement in stretch formability. By contrast, the generation of coarse grains near the surface is suggested to be the direct cause for the deterioration of the stretch formability of the specimen subjected to 7-pass deformations.

Keywords

magnesium alloy / texture / stretch formability / bending and tension deformation / mechanical properties

References

[1] Polmear IJ. Magnesium alloys and applications. Mater. Sci. Technol., 1994, 10(1): 1.

[2] Yoshinaga H, Horiuchi R. Deformation mechanisms in magnesium single crystals compressed in the direction parallel to hexagonal axis. Trans. JIM, 1963, 4(1): 1.

[3] Mcdonald JC, Bakarian PW. Anisotropy and preferred orientation in rolled magnesium alloys. Trans. Metall. Soc. AIME, 1965, 233, 95

[4] Mises RV. Mechanik der plastischen formänderung von kristallen. Z. Angew. Math. Mech., 1928, 8(3): 161.

[5] Yukutake E, Kaneko J, Sugamata M. Anisotropy and non-uniformity in plastic behavior of AZ31 magnesium alloy plates. Mater. Trans., 2003, 44(4): 452.

[6] D.K. Guan, X.G. Liu, J.H. Gao, L. Ma, B.P. Wynne, and W.M. Rainforth, Exploring the mechanism of “Rare Earth” texture evolution in a lean Mg-Zn-Ca alloy, Sci. Rep., 9(2019), art. No. 7152.

[7] Mishra RK, Gupta AK, Rao PR, Sachdev AK, Kumar AM, Luo AA. Influence of cerium on the texture and ductility of magnesium extrusions. Scripta Mater, 2008, 59(5): 562.

[8] Hantzsche K, Bohlen J, Wendt J, Kainer KU, Yi SB, Letzig D. Effect of rare earth additions on microstructure and texture development of magnesium alloy sheets. Scripta Mater, 2010, 63(7): 725.

[9] Mackenzie LWF, Pekguleryuz MO. The recrystallization and texture of magnesium-zinc-cerium alloys. Scripta Mater., 2008, 59(6): 665.

[10] Chino Y, Sassa K, Mabuchi M. Texture and stretch formability of a rolled Mg-Zn alloy containing dilute content of Y. Mater. Sci. Eng. A, 2009, 513–514, 394.

[11] Chino Y, Huang XS, Suzuki K, Mabuchi M. Enhancement of stretch formability at room temperature by addition of Ca in Mg-Zn alloy. Mater. Trans., 2010, 51(4): 818.

[12] M.R. Zhou, X.S. Huang, Y. Morisada, H. Fujii, and Y. Chino, Effects of Ca and Sr additions on microstructure, mechanical properties, and ignition temperature of hot-rolled Mg-Zn alloy, Mater. Sci. Eng. A, 769(2020), art. No. 138474.

[13] Lee JY, Yun YS, Suh BC, Kim NJ, Kim WT, Kim DH. Comparison of static recrystallization behavior in hot rolled Mg-3Al-1Zn and Mg-3Zn-0.5Ca sheets. J. Alloys Compd., 2014, 589, 240.

[14] Huang XS, Suzuki K, Chino Y, Mabuchi M. Improvement of stretch formability of Mg-3Al-1Zn alloy sheet by high temperature rolling at finishing pass. J. Alloys Compd., 2011, 509(28): 7579.

[15] Nakata T, Xu C, Ohashi H, Yoshida Y, Yoshida K, Kamado S. New Mg-Al based alloy sheet with good room-temperature stretch formability and tensile properties. Scripta Mater., 2020, 180, 16.

[16] Zhang H, Huang GS, Kong DQ, Sang GF, Song B. Influence of initial texture on formability of AZ31B magnesium alloy sheets at different temperatures. J. Mater. Process. Technol., 2011, 211(10): 1575.

[17] Habibnejad-Korayem M, Jain MK, Mishra RK. Microstructure modification and bendability improvement of AZ31 magnesium sheet by bending-unbending and annealing process. Mater. Sci. Eng. A, 2015, 648, 371.

[18] Huang XS, Suzuki K, Watazu A, Shigematsu I, Saito N. Improvement of formability of Mg-Al-Zn alloy sheet at low temperatures using differential speed rolling. J. Alloys Compd., 2009, 470(1–2): 263.

[19] Noguchi T, Suzuki K, Huang XS, Saito N, Tsukada Y, Koyama T, Chino Y. Effects of bending and tension deformation on texture evolution and room temperature formability of AZ31B alloy sheets. J. Jpn. Inst. Met. Mater, 2019, 83(6): 212.

[20] Ishiguro Y, Huang XS, Tsukada Y, Koyama T, Chino Y. Effect of bending-tension deformation on texture evolution and room temperature formability of AZ31 alloy sheet rolled at high temperature. J. Jpn. Inst. Met. Mater, 2021, 85(4): 129.

[21] Suh BC, Shim MS, Shin KS, Kim NJ. Current issues in magnesium sheet alloys: Where do we go from here?. Scripta Mater., 2014, 84–85, 1.

[22] He JJ, Jiang B, Yang Q, Xu J, Liu B, Pan FS. Improved the anisotropy of extruded Mg-3Li-3Al-Zn alloy sheet by presetting grain re-orientation and subsequent annealing. J. Alloys Compd., 2016, 676, 64.

[23] He JJ, Jiang B, Xu J, Zhang JY, Yu XW, Liu B, Pan FS. Effect of texture symmetry on mechanical performance and corrosion resistance of magnesium alloy sheet. J. Alloys Compd., 2017, 723, 213.

[24] He JJ, Mao Y, Fu YJ, Jiang B, Xiong K, Zhang SM, Pan FS. Improving the room-temperature formability of Mg-3Al-1Zn alloy sheet by introducing an orthogonal four-peak texture. J. Alloys Compd., 2019, 797, 443.

[25] Japan Standards Association. Erichsen Test Machine, 1995, Tokyo, Japan Standards Association JIS B7729

[26] Japan Standards Association. Methods for Erichsen Test, 1998, Tokyo, Japan Standards Association JIS Z2247

[27] Z.H. Li, T.T. Sasaki, M.Z. Bian, T. Nakata, Y. Yoshida, N. Kawabe, S. Kamado, and K. Hono, Role of Zn on the room temperature formability and strength in Mg-Al-Ca-Mn sheet alloys, J. Alloys Compd., 847(2020), art. No. 156347.

[28] Dobroň P, Balík J, Chmelík F, Illková K, Bohlen J, Letzig D, Lukáč P. A study of mechanical anisotropy of Mg-Zn-rare earth alloy sheet. J. Alloys Compd., 2014, 588, 628.

[29] Bohlen J, Nürnberg MR, Senn JW, Letzig D, Agnew SR. The texture and anisotropy of magnesium-zinc-rare earth alloy sheets. Acta Mater., 2007, 55(6): 2101.

[30] Jiang L, Jonas JJ, Luo AA, Sachdev AK, Godet S. Influence of {10–12} extension twinning on the flow behavior of AZ31 Mg alloy. Mater. Sci. Eng. A, 2007, 445–446, 302.

[31] Wang BS, Xin RL, Huang GJ, Liu Q. Effect of crystal orientation on the mechanical properties and strain hardening behavior of magnesium alloy AZ31 during uniaxial compression. Mater. Sci. Eng. A, 2012, 534, 588.

[32] Chino Y, Iwasaki H, Mabuchi M. Stretch formability of AZ31 Mg alloy sheets at different testing temperatures. Mater. Sci. Eng. A, 2007, 466(1–2): 90.

[33] Takayama Y, Szpunar JA, Jeong HT. Cube texture development in an Al-Mg-Mn alloy sheet worked by continuous cyclic bending. Mater. Trans., 2001, 42(10): 2050.

[34] Koike J, Kobayashi T, Mukai T, Watanabe H, Suzuki M, Maruyama K, Higashi K. The activity of non-basal slip systems and dynamic recovery at room temperature in fine-grained AZ31B magnesium alloys. Acta Mater, 2003, 51(7): 2055.

[35] Chino Y, Kimura K, Mabuchi M. Twinning behavior and deformation mechanisms of extruded AZ31 Mg alloy. Mater. Sci. Eng. A, 2008, 486(1–2): 481.

[36] Koike J, Fujiyama N, Ando D, Sutou Y. Roles of deformation twinning and dislocation slip in the fatigue failure mechanism of AZ31 Mg alloys. Scripta Mater., 2010, 63(7): 747.