Transactions of Materials and Heat Treatment

Title：Study on inclusion cracking for extruded WE43 magnesium alloy

Authors： Lyu Gang He Jianli Zhao Weidong He Jin

Unit： Shanghai University of Engineering Science

KeyWords： WE43 magnesium alloy inclusion crack critical fracture strain deformation temperature

ClassificationCode：TG146.2

year,vol(issue):pagenumber：2022,47(2):192-198

Abstract：

To study the reason and mechanism of inclusion cracking for extruded WE43 magnesium alloy, the WE43 magnesium alloy sample was scanned by scanner nano-CT to observe the morphology and size distribution of inclusions in the extruded WE43 magnesium alloy, and the WE43 magnesium alloy sample is subjected to compression tests until fracture by thermal mechanical stimulator Gleeble-3800 at different deformation temperatures (150 and 250 ℃) and different strain rates (0.001，0.01， 0.1 and 1 s-1). Then, the morphologies near the crack region of fracture samples were observed and analysed by optical microscope and scanning electron microscope.The results show that the inclusions in the extruded WE43 magnesium alloy are mainly spherical (or nearly spherical), and the size of the inclusions is about 42.94% in the range of 5-10 μm. The critical fracture strain of WE43 magnesium alloy is about 0.3, and there is no sensitivity between true stress and strain rate of WE43 magnesium alloy at the test temperature. The inclusions found at the crack edge and the crack propagation direction are important causes of magnesium alloy cracking. The EDS results show that when the deformation temperature is 150 ℃, the composition of fracturing water droplet-shaped inclusion is Mg12Nd, while when the deformation temperature is 250 ℃，the composition of fracturing massive inclusion is Mg24Y5.

Funds：

国家自然科学基金资助项目（51805313）

作者简介：吕刚（1992-），男，硕士，E-mail：2240722093@qq.com；通信作者：何建丽（1979-），女，博士，讲师，E-mail：hejianling792@163.com

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