Abstract
Background: The primary hot rolling method implemented is differential speed rolling (DSR). The material is rolled and grains are strained, producing fine dynamic recrystallization (DRX) grains that improve material strength and ductility.
Objective: The material introduced and under investigation in this paper is an Mg-based alloy, Mg5Zn (wt. %), whose microstructure is enhanced through a combination of heat treatments with proper temperature and holding time and subsequent plastic deformation through hot rolling to evaluate the effect on mechanical properties.
Methods: The method involves preheating the material to various temperatures in a range from 250ºC to 350ºC and rolling to various thickness reductions to analyze the effect of single-pass differential speed rolling (DSR) and conventional rolling (CR) on the DRX process and its influence on mechanical properties.
Results: The effect of single-pass differential speed rolling (DSR) and conventional rolling (CR) on the DRX process shows that the process produces increasing amounts of finer DRX grains at higher rolling reductions, thereby improving the strength and ductility of the material.
Conclusion: This investigation demonstrated that single-pass DSR can improve the mechanical properties and formability of Mg5Zn more effectively than CR in terms of grain refinement analyzed through OM, SEM, and EBSD resulting in enhanced tensile strength and ductility.
Graphical Abstract
[1]
Hale C. Effect of single-pass differential speed rolling on the dynamic recrystallization, microstructure, and mechanical properties of Mg5Zn. In: Maier P, Barela S, Miller VM, Neelameggham NR, Eds. Magnesium Technology. The Minerals, Metals & Materials Series. Springer,
Cham 2022; pp. 335-41.
[http://dx.doi.org/10.1007/978-3-030-92533-8_55]
[http://dx.doi.org/10.1007/978-3-030-92533-8_55]
[2]
Mordike BL, Stulíková I, Smola B. Mechanisms of creep deformation in Mg-Sc-based alloys. Metall Mater Trans, A Phys Metall Mater Sci 2005; 36(7): 1729-36.
[http://dx.doi.org/10.1007/s11661-005-0037-z]
[http://dx.doi.org/10.1007/s11661-005-0037-z]
[3]
Kainer KU. Magnesium alloys and their applications. Wiley 2000; pp. 1-46.
[http://dx.doi.org/10.1002/3527607552]
[http://dx.doi.org/10.1002/3527607552]
[4]
Homma T, Kunito N, Kamado S. Fabrication of extraordinary high-strength magnesium alloy by hot extrusion. Scr Mater 2009; 61(6): 644-7.
[http://dx.doi.org/10.1016/j.scriptamat.2009.06.003]
[http://dx.doi.org/10.1016/j.scriptamat.2009.06.003]
[5]
Muralidhar A. Effect of equal channel angular pressing on AZ31 wrought magnesium alloys. J Mag Alloys 2013; 1(4): 336-40.
[http://dx.doi.org/10.1016/j.jma.2013.11.007]
[http://dx.doi.org/10.1016/j.jma.2013.11.007]
[6]
Kuhn H, Medin D. Mechanical testing and evaluation.ASM Handbook. Ohio: ASM 2000; 08: p. 7.
[http://dx.doi.org/10.31399/asm.hb.v08.9781627081764]
[http://dx.doi.org/10.31399/asm.hb.v08.9781627081764]
[7]
Hsiang SH, Lin YW. Investigation of the influence of process parameters on hot extrusion of magnesium alloy tubes. J Mater Process Technol 2007; 192-193: 292-9.
[http://dx.doi.org/10.1016/j.jmatprotec.2007.04.063]
[http://dx.doi.org/10.1016/j.jmatprotec.2007.04.063]
[8]
Yoshimoto S, Yamasaki M, Kawamura Y. Microstructure and mechanical properties of extruded Mg-Zn-Y alloys with 14H long peri-od ordered structure. Mater Trans 2006; 47(4): 959-65.
[http://dx.doi.org/10.2320/matertrans.47.959]
[http://dx.doi.org/10.2320/matertrans.47.959]
[9]
Chang TC, Wang J-Y. O C-M, Lee S. Grain refining of magnesium alloy AZ31 by rolling. J Mater Process Technol 2003; 140(1-3): 588-91.
[http://dx.doi.org/10.1016/S0924-0136(03)00797-0]
[http://dx.doi.org/10.1016/S0924-0136(03)00797-0]
[10]
Kim WJ, Park JD, Kim WY. Effect of differential speed rolling on microstructure and mechanical properties of an AZ91 magnesium alloy. J Alloys Compd 2008; 460(1-2): 289-93.
[http://dx.doi.org/10.1016/j.jallcom.2007.06.050]
[http://dx.doi.org/10.1016/j.jallcom.2007.06.050]
[11]
Kim WJ, Kim MJ, Wang JY. Superplastic behavior of a fine-grained ZK60 magnesium alloy processed by high-ratio differential speed rolling. Mater Sci Eng A 2009; 527(1-2): 322-7.
[http://dx.doi.org/10.1016/j.msea.2009.08.064]
[http://dx.doi.org/10.1016/j.msea.2009.08.064]
[12]
Koike J. Enhanced deformation mechanisms by anisotropic plasticity in polycrystalline Mg alloys at room temperature. Metallur Mater Transac a-Phy Metallur. Mater Sci 2005; 36a(7): 1689-96.
[http://dx.doi.org/10.1007/s11661-005-0032-4]
[http://dx.doi.org/10.1007/s11661-005-0032-4]
[13]
Koike J, Kobayashi T, Mukai T, et al. The activity of non-basal slip systems and dynamic recovery at room temperature in fine-grained AZ31B magnesium alloys. Acta Mater 2003; 51(7): 2055-65.
[http://dx.doi.org/10.1016/S1359-6454(03)00005-3]
[http://dx.doi.org/10.1016/S1359-6454(03)00005-3]
[14]
Sun H, Liang S, Wang E. Mechanical properties and texture evolution during hot rolling of AZ31 magnesium alloy. Trans Nonferrous Met Soc China 2009; 19: s349-54.
[http://dx.doi.org/10.1016/S1003-6326(10)60067-2]
[http://dx.doi.org/10.1016/S1003-6326(10)60067-2]
[15]
Wang W, Chen W, Zhang W, Cui G, Wang E. Effect of deformation temperature on texture and mechanical properties of ZK60 magne-sium alloy sheet rolled by multi-pass lowered-temperature rolling. Mater Sci Eng A 2018; 712: 608-15.
[http://dx.doi.org/10.1016/j.msea.2017.12.024]
[http://dx.doi.org/10.1016/j.msea.2017.12.024]
[16]
Nie JF. Precipitation and hardening in magnesium alloys. Metall Mater Trans, A Phys Metall Mater Sci 2012; 43(11): 3891-939.
[http://dx.doi.org/10.1007/s11661-012-1217-2]
[http://dx.doi.org/10.1007/s11661-012-1217-2]
[17]
Lee JB. Grain refinement and texture evolution in AZ31 Mg alloys sheet processed by differential speed rolling 2009.
[http://dx.doi.org/10.1016/j.mseb.2009.02.021]
[http://dx.doi.org/10.1016/j.mseb.2009.02.021]
[18]
Hale C. Optimization of mechanical properties in Magnesium-Zinc Alloys. In: Miller VM, Maier P, Jordon JB, Neelameggham NR, Eds. Magnesium Technology. The Minerals, Metals & Materials Series. Springer 2021.
[http://dx.doi.org/10.1007/978-3-030-65528-0_25]
[http://dx.doi.org/10.1007/978-3-030-65528-0_25]
[19]
Huang X, Suzuki K, Watazu A, Shigematsu I, Saito N. Mechanical properties of Mg–Al–Zn alloy with a tilted basal texture obtained by differential speed rolling. Mater Sci Eng A 2008; 488(1-2): 214-20.
[http://dx.doi.org/10.1016/j.msea.2007.11.029]
[http://dx.doi.org/10.1016/j.msea.2007.11.029]
[20]
Kim WJ, Lee YG, Lee MJ, Wang JY, Park YB. Exceptionally high strength in Mg–3Al–1Zn alloy processed by high-ratio differential speed rolling. Scr Mater 2011; 65(12): 1105-8.
[http://dx.doi.org/10.1016/j.scriptamat.2011.09.029]
[http://dx.doi.org/10.1016/j.scriptamat.2011.09.029]
[21]
Hamad K, Chung BK, Ko YG. Microstructure and mechanical properties of severely deformed Mg–3%Al–1%Zn alloy via isothermal differential speed rolling at 453K. J Alloys Compd 2014; 615: S590-4.
[http://dx.doi.org/10.1016/j.jallcom.2013.12.195]
[http://dx.doi.org/10.1016/j.jallcom.2013.12.195]
[22]
Cho JH, Jeong SS, Kim HW, Kang SB. Texture and microstructure evolution during the symmetric and asymmetric rolling of AZ31B magnesium alloys. Mater Sci Eng A 2013; 566: 40-6.
[http://dx.doi.org/10.1016/j.msea.2012.12.066]
[http://dx.doi.org/10.1016/j.msea.2012.12.066]
[23]
Kaseem M, Chung BK, Yang HW, Hamad K, Ko YG. Effect of deformation temperature on microstructure and mechanical properties of AZ31 Mg alloy processed by differential speed rolling. J Mater Sci Technol 2015; 31(5): 498-503.
[http://dx.doi.org/10.1016/j.jmst.2014.08.016]
[http://dx.doi.org/10.1016/j.jmst.2014.08.016]
[24]
Watanabe H, Mukai T, Ishikawa K. Effect of temperature of differential speed rolling on room temperature mechanical properties and texture in an AZ31 magnesium alloy. J Mater Process Technol 2007; 182(1-3): 644-7.
[http://dx.doi.org/10.1016/j.jmatprotec.2006.08.010]
[http://dx.doi.org/10.1016/j.jmatprotec.2006.08.010]
[25]
Kim WJ, Hwang BG, Lee MJ, Park YB. Effect of speed-ratio on microstructure, and mechanical properties of Mg–3Al–1Zn alloy, in differential speed rolling. J Alloys Compd 2011; 509(34): 8510-7.
[http://dx.doi.org/10.1016/j.jallcom.2011.05.063]
[http://dx.doi.org/10.1016/j.jallcom.2011.05.063]
[26]
Huang X, Suzuki K, Watazu A, Shigematsu I, Saito N. Effects of thickness reduction per pass on microstructure and texture of Mg–3Al–1Zn alloy sheet processed by differential speed rolling. Scr Mater 2009; 60(11): 964-7.
[http://dx.doi.org/10.1016/j.scriptamat.2009.02.022]
[http://dx.doi.org/10.1016/j.scriptamat.2009.02.022]
[27]
Ko YG, Hamad K. Structural features and mechanical properties of AZ31 Mg alloy warm-deformed by differential speed rolling. J Alloys Compd 2018; 744: 96-103.
[http://dx.doi.org/10.1016/j.jallcom.2018.02.095]
[http://dx.doi.org/10.1016/j.jallcom.2018.02.095]
[28]
Chapuis A, Driver JH. Temperature dependency of slip and twinning in plane strain compressed magnesium single crystals. Acta Mater 2011; 59(5): 1986-94.
[http://dx.doi.org/10.1016/j.actamat.2010.11.064]
[http://dx.doi.org/10.1016/j.actamat.2010.11.064]
[29]
Russell A, Lee K. Structure-property relations in nonferrous metals. Wiley-Interscience 2005; pp. 28-32.
[http://dx.doi.org/10.1002/0471708542.ch3]
[http://dx.doi.org/10.1002/0471708542.ch3]
