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To widen the application of the magnesium sheet alloys, good room temperature (RT) formability and satisfactory strength need to be achieved. The development of heat treatable alloy can be an effective approach to simultaneously achieve the good RT formability and satisfactory strength. In this work, we have investigated the effects of Zn content on the microstructure, stretch formability and mechanical properties in the Mg–xZn–0.36Zr–0.32Ca (x = 3, 4, 5 wt%) sheet alloys. The as-rolled samples showed strong basal textures regardless of the Zn content. However, the decrease in the Zn content resulted in the significant texture weakening in the solution treated samples, and this leads to the improvement of the stretch formability up to 7.3 mm in Index Erichsen value in the Mg–3.1Zn–0.36Zr–0.32Ca alloy. Subsequent artificial aging at 160 °C for 16 h slightly increased the tensile yield strength of Mg–4Zn–0.36Zr–0.32Ca alloy sheet from 176 to 194 MPa. This work has demonstrated that the Mg–Zn system is promising to achieve excellent RT formability and high strength, however, the slow age hardening kinetics needs to be improved to make it industrially viable.
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W.J. Joost, P.E. Krajewski, Towards magnesium alloys for high-volume automotive applications, Scr. Mater. 128 (2017) 107–112.
B.-C. Suh, M.-S. Shim, K.S. Shin, N.J. Kim, Current issues in magnesium sheet alloys: Where do we go from here?, Scr. Mater. 84 (2014) 1–6.
Y. Chino, K. Sassa, M. Mabuchi, Texture and stretch formability of a rolled Mg–Zn alloy containing dilute content of Y, Mater. Sci. Eng. A. 513–514 (2009) 394–400.
Y. Chino, M. Mabuchi, Enhanced stretch formability of Mg–Al–Zn alloy sheets rolled at high temperature (723 K), Scr. Mater. 60 (2009) 447–450.
X. Huang, K. Suzuki, Y. Chino, Influences of initial texture on microstructure and stretch formability of Mg–3Al–1Zn alloy sheet obtained by a combination of high temperature and subsequent warm rolling, Scr. Mater. 63 (2010) 395–398.
X. Huang, K. Suzuki, Y. Chino, M. Mabuchi, Improvement of stretch formability of Mg–3Al–1Zn alloy sheet by high temperature rolling at finishing pass, J. Alloys Compd. 509 (2011) 7579–7584.
T. Bhattacharjee, B.-C. Suh, T.T. Sasaki, T. Ohkubo, N.J. Kim, K. Hono, High strength and formable Mg–6.2Zn–0.5Zr–0.2Ca alloy sheet processed by twin roll casting, Mater. Sci. Eng. A. 609 (2014) 154–160.
M.Z. Bian, Z.R. Zeng, S.W. Xu, S.M. Zhu, Y.M. Zhu, C.H.J. Davies, N. Birbilis, J.F. Nie, Improving Formability of Mg–Ca–Zr Sheet Alloy by Microalloying of Zn, Adv. Eng. Mater. 18 (2016) 1763–1769.
Y. Chino, H. Iwasaki, M. Mabuchi, Stretch formability of AZ31 Mg alloy sheets at different testing temperatures, Mater. Sci. Eng. A. 466 (2007) 90–95.
D. Wu, R.S. Chen, E.H. Han, Excellent room-temperature ductility and formability of rolled Mg–Gd–Zn alloy sheets, J. Alloys Compd. 509 (2011) 2856–2863.
T. Bhattacharjee, B.C. Suh, T.T. Sasaki, T. Ohkubo, N.J. Kim, K. Hono, High strength and formable Mg-6.2Zn-0.5Zr-0.2Ca alloy sheet processed by twin roll casting, Mater. Sci. Eng. A. 609 (2014) 154–160.
Y. Chino, X. Huang, K. Suzuki, M. Mabuchi, Enhancement of Stretch Formability at Room Temperature by Addition of Ca in Mg–Zn Alloy, Mater. Trans. 51 (2010) 818–821.
Y. Chino, X. Huang, K. Suzuki, K. Sassa, M. Mabuchi, Influence of Zn concentration on stretch formability at room temperature of Mg–Zn–Ce alloy, Mater. Sci. Eng. A. 528 (2010) 566–572.
Y. Chino, T. Ueda, Y. Otomatsu, K. Sassa, X. Huang, K. Suzuki, M. Mabuchi, Effects of Ca on Tensile Properties and Stretch Formability at Room Temperature in Mg–Zn and Mg–Al Alloys, Mater. Trans. 52 (2011) 1477–1482.
D.H. Kang, D.W. Kim, S. Kim, G.T. Bae, K.H. Kim, N.J. Kim, Relationship between stretch formability and work-hardening capacity of twin-roll cast Mg alloys at room temperature, Scr. Mater. 61 (2009) 768–771.
S.J. Park, H.C. Jung, K.S. Shin, Deformation behaviors of twin roll cast Mg–Zn–X–Ca alloys for enhanced room-temperature formability, Mater. Sci. Eng. A. 679 (2017) 329–339.
C.J. Bettles, M.A. Gibson, K. Venkatesan, Enhanced age-hardening behaviour in Mg-4 wt.% Zn micro-alloyed with Ca, Scr. Mater. 51 (2004) 193–197.
- Alloy Design for the Development of Heat Treatable High Strength Mg Sheet Alloy with Excellent Room Temperature Formability
T. T. Sasaki
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