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摘要：
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基于DEFORM-3D数值分析软件，模拟了Mg-9Gd-3Y-0.6Zr-0.05Ag镁合金模锻件的成形过程，并研究了其顶部(T)、中部(M)和底部(B)的微观组织和力学性能。结果表明：模锻成形后，模锻件内部区域的温度和应变沿挤压方向从顶部至底部的分布不均匀，其中，温度呈现逐渐升高的趋势，应变呈现先增大、后减小的趋势。在晶粒尺寸与织构的共同作用下，模锻件底部的屈服强度最高、中部次之、顶部最低。模锻件温度和应变的分布特点导致了其中部具有更加均匀的组织和较弱的织构，从而体现出最优的综合力学性能,即：屈服强度为198 MPa、抗拉强度为312 MPa、伸长率为17.0%。
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Based on the numerical simulation software DEFORM-3D, the die forging process of Mg-9Gd-3Y-0.6Zr-0.05Ag magnesium alloy was simulated, and the microstructures and mechanical properties in the top (T), middle (M) and bottom (B) of forgings were studied. The results show that after die forging, the temperature and strain in the inner region of forgings are unevenly distributed from T to B along the extrusion direction. Among them, the temperature gradually increases, and the strain first increases and then decreases. In addition, under the combined effect of grain size and texture, the yield strength of forgings is the highest in the B followed by the M, and it is lowest in the T. Thus, the temperature and strain distribution characteristics of forgings lead to more uniform structure and weaker texture in the M, which reflects the optimal comprehensive mechanical properties with the yield strength of 198 MPa, the tensile strength of 312 MPa and the elongation of 17.0%.
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基金项目：
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湖南省自然科学基金资助项目（2019JJ50787）
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作者简介：
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张宗良（1995-），男，硕士研究生，E-mail：1035482180@qq.com；通讯作者：高永浩（1986-），男，博士，副教授，E-mail：gaoyonghao_009@163.com
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参考文献：
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[1]Mordike B L, Ebert T. Magnesium: Properties-applications-potential [J]. Materials Science & Engineering A, 2001, 302(1): 37-45.
[2]Xu T C, Yang Y, Peng X D, et al. Overview of advancement and development trend on magnesium alloy [J]. Journal of Magnesium and Alloys, 2019, 3(7):536-544.
[3]You S H, Huang Y D, Ulrich Kainer K, et al. Recent research and developments on wrought magnesium alloys [J]. Journal of Magnesium and Alloys, 2017, 5(3):239-253.
[4]Zhang J H, Liu S J, Wu R Z, et al. Recent developments in high-strength Mg-RE-based alloys: Focusing on Mg-Gd and Mg-Y systems [J]. Journal of Magnesium and Alloys, 2018, 6(3):277-291.
[5]Yu Z J, Huang Y D, Qiu X, et al. Fabrication of a high strength Mg-11Gd-4.5Y-1Nd-1.5Zn-0.5Zr (wt%) alloy by thermomechanical treatments [J]. Materials Science & Engineering A, 2015, 622: 121-130.
[6]Pan H C, Ren Y P, Fu H, et al. Recent developmemts in rare-earth free wrought magnesium alloy having high strength: A review [J]. Journal of Alloys and Compounds, 2016, 663: 321-331.
[7]Shan D B, Xu W C, Lu Y, et al. Study on precision forging technology for a complex-shaped light alloy forging [J]. Journal of Materials Processing Technology, 2004, 151(1-3):289-293.
[8]Skubisz P, Sinczak J, Bednarek S, et al. Forgeability of Mg-Al-Zn magnesium alloys in hot and warm closed die forging [J]. Journal of Materials Processing Technology, 2006, 177(1-3):210-213.
[9]Yu S L, Liu C M, Gao Y H, et al. Microstructure, texture and mechanical properties of Mg-Gd-Y-Zr alloy annular forging processed by hot ring rolling [J]. Materials Science & Engineering A, 2017, 689: 40-47.
[10]Xu J, Yang T H, Jiang B, et al. Improved mechanical properties of Mg-3Al-1Zn alloy sheets by optimizing the extrusion die angles: Microstructural and texture evolution [J]. Journal of Alloys and Compounds, 2018, 762: 719-729.
[11]Huang H, Zhang J. Microstructure and mechanical properties of AZ31 magnesium alloy processed by multi-directional forging at different temperatures [J]. Materials Science & Engineering A, 2016, 674: 52-58.
[12]Xia X S, Chen Q, Li J P, 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.
[13]Yu Z J, Xu C, Meng J, et al. Effects of extrusion ratio and temperature on the mechanical properties and microstructure of as-extruded Mg-Gd-Y-(Nd/Zn)-Zr alloys [J]. Materials Science & Engineering A, 2019, 762: 138080.
[14]Li B, Teng B G, Chen G X, et al. Microstructure evolution and mechanical properties of Mg-Gd-Y-Zn-Zr alloy during equal channel angular pressing [J]. Materials Science & Engineering A, 2019, 744: 396-405.
[15]Xiao H C, Jiang S N, Tang B, et al. Hot deformation and dynamic recrystallization behaviors of Mg-Gd-Y-Zr alloy [J]. Materials Science & Engineering A, 2015, 628: 311-318.
[16]Zhang G X,Zhang Z M, Li X B, et al. Effects of repetitive upsetting-extrusion parameters on microstructure and texture evolution of Mg-Gd-Y-Zn-Zr alloy [J]. Journal of Alloys and Compounds, 2019, 790: 48-57.
[17]Huang X S, Chino Y, Yuasa M, et al. Microstructure and mechanical properties of AZX912 magnesium alloy extruded at different temperatures [J]. Materials Science & Engineering A,2017, 679: 162-171.
[18]Tang L C, Liu C M, Chen Z Y, et al. Microstructures and tensile properties of Mg-Gd-Y-Zr alloy during multidirectional forging at 773 K[J]. Materials & Design, 2013, 50:587-596.
[19]Hu Z, Chen Z Y, Xiong J Y, et al. Microstructure and mechanical properties of Mg-6.75%Zn-0.57%Zr-0.4%Y-0.18%Gd sheets by unidirectional and cross rolling [J]. Materials Science & Engineering A, 2016, 662: 519-527.
[20]Wang Y N, Huang J C. The role of twinning and untwining in yielding behavior in hot-extruded Mg-Al-Zn alloy [J]. Acta Materialia, 2007, 55: 897-905.
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