锻压技术

脉冲电流密度对汽车用Al-Mg-Si-Cu铝合金拉伸力学性能的影响

英文标题：Influence of pulse current density on tensile mechanical properties of Al-Mg-Si-Cu aluminum alloy for automobile

作者：原涛赵跃文

单位：太原工业学院

分类号：TG146.2

出版年,卷(期):页码：2019,44(1):171-175

摘要：

以汽车用Al-Mg-Si-Cu铝合金作为实验对象，研究了不同脉冲电流密度（100，150和200 A·mm-2）下得到的Al-Mg-Si-Cu铝合金试样的力学性能，并对试样的微观组织形貌进行了光学显微镜与扫描电镜表征。研究结果表明：试样受到单脉冲电流作用后会导致温度出现迅速上升；当对试样通入辅助电流后，流动应力也会发生更加明显地下降。在3种脉冲电流密度下，试样断裂后的应变量分别为0.246，0.256和0.262。当脉冲电流保持恒定时，随着应变值不断变大，应力降值将会表现出线性增长的趋势；随着脉冲电流密度的增加，应力降值也会更加明显。随着脉冲电流密度上升，合金组织的晶界区域生成许多细小的等轴晶。当试样中通入脉冲电流后，试样的宏观断口发生明显的颈缩现象，纤维区显著增大，并产生众多撕裂棱。

For Al-Mg-Si-Cu aluminum alloy used for automobile, its mechanical properties under different pulse current densities (100, 150, 200 A·mm-2) were studied, and the microstructure morphology of sample was obtained by the optical microscope and scanning electron microscopy. The results show that the temperature rises rapidly when the sample is subjected to a single pulse current. When the sample is connected to an auxiliary current, the flow stress also decreases significantly. And the strains after sample fracture under three pulse current densities are 0.246, 0.256 and 0.262, respectively. When the pulse current remains constant, the stress drop will show a linear growth trend with the increasing of strain values. However, with the increasing of pulse current density, the stress drop is more obvious, and many small isometric crystals are generated in the grain boundary region of alloy tissue. Thus, when the pulse current is passed into the sample, the macroscopic fracture of sample will have significant necking phenomenon, the fiber area is significantly enlarged, and many tearing edges are produced.

基金项目：

山西省自然科学基金资助项目（20140321014-02）

原涛（1971-）男，学士，讲师，E-mail：bengtannuo054101@126.com

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