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

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