Transactions of Materials and Heat Treatment

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

Authors： Yuan Tao Zhao Yuewen

Unit： Taiyuan Institute of Technology

KeyWords： Al-Mg-Si-Cu aluminum alloy pulse current mechanical properties microstructure fracture morphology

ClassificationCode：TG146.2

year,vol(issue):pagenumber：2019,44(1):171-175

Abstract：

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.

Funds：

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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