锻压技术

应变对车用挤压态Mg-4Zn-1.2Y合金原位拉伸组织演变的影响

英文标题：Influence of strain on in-situ tensile microstructure evolution for automotive extruded Mg-4Zn-1.2Y alloy

作者：杨敬江张明李刚

单位：1.杭州职业技术学院吉利汽车学院 2. 浙江工业大学机械学院 3. 浙江吉利汽车制造有限公司

分类号：TG146

出版年,卷(期):页码：2022,47(9):245-249

摘要：

综合运用原位电子背散射衍射和微拉伸测试方法，对车轻量化用Mg-4Zn-1.2Y合金进行了测试，并分析了应变对合金原位拉伸组织演变的影响。研究结果表明：原位拉伸测试得到的试样的拉伸强度达到218 MPa，伸长率为25.3%，在应变为26%时，试样断裂。随着拉伸应变程度的增加，合金产生了更多裂纹，裂纹尺寸也增加。拉伸过程中产生的孪晶可以对晶粒变形发挥一定的协调作用，从而消除应力集中的现象，避免晶体组织开裂。初始拉伸试样的晶粒取向角在0°~50°范围内时，晶粒取向角的数量分布表现为接近正态分布的特征，晶粒取向角主要位于20°~30°之间；应变达到20%时，20°~30°之间的取向角占比已经超过10%。15%原位拉伸应变下，Mg-4Zn-1.2Y合金产生的孪生对晶粒取向起到良好的调节作用。

The test of Mg-4Zn-1.2Y alloy for auto mobile lightweight was conducted by comprehensively using in-situ electron backscatter diffraction (EPD) and micro-tensile test methods, and the influence of strain on the in-site tensile microstructure evolution for alloy was analyzed. The research results show that the tensile strength of specimen is 218 MPa, the elongation is 25.3% obtained by in-situ tensile test, and the specimen breaks at the strain of 26%. With the increasing of tensile strain degree, more cracks occur in the alloy and the crack size increases. The twins produced in the tensile process can coordinate the grain deformation to a certain extent to eliminate the stress concentration phenomenon and avoid the crystal structure cracking. When the grain orientation angle of initial tensile specimen is in the range of 0°-50°, the quantitutive distribution of grain orientation angles is close to normal distribution characteristic, and the grain orientation angle is mainly in the range of 20°-30°. When the strain reaches 20%, the proportion of orientation angles in the range of 20°-30° is more than 10%, and the twinning produced in Mg-4Zn-1.2Y alloy under the in-situ tensile strain of 15% plays a good role in regulating grain orientation.

基金项目：

浙江省自然科学基金资助项目(LQ19E050104)

杨敬江(1981-)，男，硕士，高级实验师 E-mail：yh15036956421@163.com

参考文献：

[1]武昌, 赵天亮, 许晋, 等. Al-Nb-B细化纯镁原位拉伸变形机制及其断裂机理[J]. 中国有色金属学报, 2021,31(8): 2081-2090.

Wu C, Zhao T L, Xu J, et al.In situ tensile deformation and fracture mechanism of Al-Nb-refined pure magnesium [J]. The Chinese Journal of Nonferrous Metals, 2021, 31(8): 2081-2090.

[2]罗锡才, 刘灏霖, 康利梅, 等. 搅拌摩擦加工方向对AZ61镁合金组织和力学性能的影响[J]. 材料研究与应用, 2021, 15(3): 203-209.

Luo X C, Liu H L, Kang L M, et al.Effect of friction stir processing direction on microstructure and mechanical properties of AZ61 magnesium alloy [J].Journal of Materials Research and Application, 2021, 15(3): 203-209.

[3]郭丽丽, 郭浩然, 汪建强, 等. 轧制工艺对连续挤压AZ31镁合金板材成形性的影响[J]. 塑性工程学报, 2021, 28(7): 56-63.

Guo L L, Guo H R, Wang J Q, et al. Influence of rolling process on formability of continuously extruded AZ31 magnesium alloy sheets [J].Journal of Plasticity Engineering, 2021, 28(7): 56-63.

[4]李磊, 郎利辉,轩永波,等. 基于单向拉伸的半固化GLARE层板成形性能分析[J]. 锻压技术, 2021, 46(2): 200-205.

Li L, Lang L H, Xuan Y B, et al. Analysis on forming performance of semi-cured GLARE laminate based on uniaxial tensile [J]. Forging & Stamping Technology, 2021, 46(2): 200-205.

[5]张丽英, 张晨, 郭翰韬, 等.晶间变形行为对AZ31镁合金延展性的影响[J]. 塑性工程学报, 2021, 28(4): 136-145.

Zhang L Y, Zhang C, Guo H T, et al. Effect of intergranular deformation behavior on ductility of AZ31 magnesium alloy [J].Journal of Plasticity Engineering, 2021, 28(4): 136-145.

[6]Ventura N M D, Kalácska S, Casari D, et al. {10-12} twinning mechanism during in situ micro-tensile loading of pure Mg: Role of basal slip and twin-twin interactions [J]. Materials & Design, 2021, 197: 109206.

[7]余富忠, 赵强李. 多向锻造对汽车用AZ80镁合金组织及性能的影响[J]. 锻压技术, 2021, 46(3):32-36.

Yu F Z, Zhao Q L. Influence of multi-directional forging on micro-structure and properties for AZ80 magnesium alloy used for automobile[J]. Forging & Stamping Technology, 2021, 46(3): 32-36.

[8]郑庭坚, 张丽霞, 廖娟. 超声振动辅助镁合金板拉伸力学行为及本构建模[J]. 塑性工程学报, 2020, 27(12): 170-176.

Zheng T J, Zhang L X, Liao J. Mechanical behavior and constitutive modeling of magnesium alloy sheet in ultrasonic vibration assisted tensile test[J]. Journal of Plasticity Engineering, 2020, 27(12): 170-176.

[9]付三玲, 李全安, 张清. Mg-12Gd-2Y-1Sm-0.5Zr镁合金高温拉伸过程中的显微组织演变[J]. 材料热处理学报, 2019, 40(12): 32-38.

Fu S L, Li Q A, Zhang Q. Microstructure evolution of Mg-12GD-2Y-1Sm-0.5Zr magnesium alloy during high temperature tensile process [J].Journal of Materials and Heat Treatment, 2019, 40(12): 32-38.

[10]肖震东, 刘宇坤, 国宏伟, 等. 不同形变温度下Mg-Al-Ca-Mn合金的变形机制[J]. 塑性工程学报, 2019, 26(5): 174-179.

Xiao Z D, Liu Y K, Guo H W, et al. Deformation mechanism of Mg-Al-Ca-Mn alloy at different deformation temperatures [J]. Journal of Plasticity Engineering, 2019, 26(5): 174-179.

[11]杨柳, 官英平, 段永川, 等. 轧制态ME20M镁合金热拉伸变形行为及加工图[J]. 稀有金属材料与工程, 2020, 49(5): 1715-1721.

Yang L, Guan Y P, Duan Y C, et al. Hot tensile deformation behavior and processing of rolled ME20M magnesium alloy[J]. Rare Metal Materials and Engineering, 2020, 49(5): 1715-1721.

[12]郭丽丽, 郭浩然, 汪建强, 等. 轧制工艺对连续挤压AZ31镁合金板材成形性的影响[J]. 塑性工程学报, 2021, 28(7): 56-63.

Guo L L, Guo H R, Wang J Q, et al. Influence of rolling process on formability of continuously extruded AZ31 magnesium alloy sheets [J]. Journal of Plasticity Engineering, 2021, 28(7): 56-63.

[13]顾佳卿, 唐伟能, 徐世伟. Mg-0.4Zn镁合金挤压板拉伸变形组织的演变[J]. 材料研究学报, 2021, 35(7): 553-560.

Gu J Q, Tang W N, Xu S W. Microstructure evolution during tensile deformation of an extruded Mg-0.4Zn alloy plate [J]. Journal of Materials Research, 2021, 35(7): 553-560.

[14]Jain A, Duygulu O, Brown D W, et al. Grain size effects on the tensile properties and deformation mechanisms of a magnesium alloy AZ31B sheet [J]. Materials Science & Engineering, 2008, (1/2): 545-555.

[15]Reed-Hill R E, Robertson W D. Additional modes of deformation twinning in magnesium [J]. Acta Metallurgica, 1957, 5(12): 689-768.

服务与反馈：

【本网站尚未开通全文下载服务】【加入收藏】