Abstract
Hot compression tests on AZ40 magnesium alloy were conducted on a Gleeble 1500d hot simulation testing machine in a deformation temperature range of 330 °C-420 °C and a strain rate range of 0.002-2 s-1. Hot deformation behaviors were investigated on the basis of the analysis of the flow stressstrain curves, constitutive equation, and processing map. The stress exponent and apparent activation energy were calculated to be 5.821 and 173.96 kJ/mol, respectively. Deformation twins and cracks located in grain boundaries were generated at 330 °C and 0.02 s-1, which are associated with a high strain rate and a limited number of available slip systems. With increasing temperature and decreasing strain rate, the twins disappeared and the degree of dynamic recrystallization increased. The alloy was completely dynamically recrystallized at 420 °C and 0.002 s-1, with a homogenous grain size of approximately 13.7 μm. The instability domains of the deformation behavior can be recognized by processing maps. By considering the processing maps and characterizing the microstructure, the optimum hot deformation parameters in this experiment were determined to be 420 °C and 0.002 s-1.
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Suresh K, Rao KP, Prasad Y, et al. Study of Hot Forging Behavior of As-cast Mg-3Al-1Zn-2Ca Alloy towards Optimization of Its Hot Workability[J]. Materials & Design, 2014, 57: 697–704
Agnew SR, Duygulu Ö. Plastic Anisotropy and the Role of Non-basal Slip in Magnesium Alloy AZ31B[J]. International Journal of plasticity, 2005, 21(6): 1 161–1 193
Mukai T, Yamanoi M, Watanabe H, et al. Ductility Enhancement in AZ31 Magnesium Alloy by Controlling Its Grain Structure[J]. Scripta Materialia, 2001, 45(1): 89–94
Yamashita A, Horita Z, Langdon TG. Improving the Mechanical Properties of Magnesium and a Magnesium Alloy through Severe Plastic Deformation[J]. Materials Science and Engineering: A, 2001, 300(1): 142–147
Barnett MR. Twinning and the Ductility of Magnesium Alloys: Part I: “Tension” Twins[J]. Materials Science and Engineering: A, 2007, 464(1): 1–7
Deng J, Lin YC, Li SS, et al. Hot Tensile Deformation and Fracture Behaviors of AZ31 Magnesium Alloy[J]. Materials & Design, 2013, 49: 209–219
Fatemi-Varzaneh SM, Zarei-Hanzaki A, Beladi H. Dynamic Recrystallization in AZ31 Magnesium Alloy[J]. Materials Science and Engineering: A, 2007, 456(1): 52–57
Fu XS, Chen GQ, Wang ZQ, et al. DRX Mechanism of AZ31 Magnesium Alloy during Hot Rolling[J]. Rare Metal Materials and Engineering, 2011, 40(8): 1 473–1 477
Srinivasan N, Prasad Y, Rao PR. Hot Deformation Behaviour of Mg- 3Al Alloy—A Study Using Processing Map[J]. Materials Science and Engineering: A, 2008, 476(1): 146–156
Xu SW, Kamado S, Matsumoto N, et al. Recrystallization Mechanism of As-cast AZ91 Magnesium Alloy during Hot Compressive Deformation[J]. Materials Science and Engineering: A, 2009, 527(1): 52–60
Wang H, Wang G, Hu L, et al. Effect of Hot Rolling on Grain Refining and Mechanical Properties of AZ40 Magnesium alloy[J]. Transactions of Nonferrous Metals Society of China, 2011, 21: s229-s234
Lv BJ, Peng J, Wang YJ, et al. Dynamic Recrystallization Behavior and Hot Workability of Mg-2.0Zn-0.3Zr-0.9Y Alloy by Using Hot Compression Test[J]. Materials & Design, 2014, 53: 357–365
Xia XS, Chen Q, Li JP, et al. Characterization of Hot Deformation Behavior of As-extruded Mg-Gd-Y-Zn-Zr alloy[J]. Journal of Alloys and Compounds, 2014, 610: 203–211
Li L, Zhang X. Hot Compression Deformation Behavior and Processing Parameters of A Cast Mg-Gd-Y-Zr Alloy[J]. Materials Science and Engineering: A, 2011, 528(3): 1 396–1 401
Slooff FA, Dzwonczyk JS, Zhou J, et al. Hot Workability Analysis of Extruded AZ Magnesium Alloys with Processing Maps[J]. Materials Science and Engineering: A, 2010, 527(3): 735–744
Iwanaga K, Tashiro H, Okamoto H, Shimizu K. Improvement of Formability from Room Temperature to Warm Temperature in AZ- 31 Magnesium Alloy[J]. Journal of Materials Processing Technology, 2004, 155: 1 313–1 316
Zarandi F, Seale G, Verma R, et al. Effect of Al and Mn Additions on Rolling and Deformation Behavior of AZ Series Magnesium Alloys[J]. Materials Science and Engineering: A, 2008, 496(1): 159–168
Galiyev A, Kaibyshev R, Gottstein G. Correlation of Plastic Deformation and Dynamic Recrystallization in Magnesium Alloy ZK60[J]. Acta Materialia, 2001, 49(7): 1 199–1 207
Prasad V, Sasidhara S. Hot Working Guide: A Compendium of Processing Maps[M]. ASM international, 1997: 157–182
Prasad Y, Rao KP. Effect of Homogenization on the Hot Deformation Behavior of Cast AZ31 Magnesium Alloy[J]. Materials & Design, 2009, 30(9): 3 723–3 730
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Funded by the National Natural Science Foundation of China(No.51204020), the National Program on Key Basic Research Project (No 2013CB632202), and the Qinghai Provincial Science and Technology Support Project (2014-GX-106A)
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Lai, L., Zhang, K., Ma, M. et al. Hot deformation behavior of AZ40 magnesium alloy at elevated temperatures. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 32, 1470–1475 (2017). https://doi.org/10.1007/s11595-017-1770-z
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DOI: https://doi.org/10.1007/s11595-017-1770-z