| METALS AND METAL MATRIX COMPOSITES |
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| The Dynamic Impact Behavior of an Extruded and T5-tempered Mg-8Gd-4Y-Nd-Zr Alloy |
| TANG Changping1,2, ZUO Guoliang1,2, LIU Wenhui1,2, ZHU Meiyun1,2, LI Zhiyun3, LI Quan4, LIU Xiao1,2, LU Liwei1,2
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1 School of Materials Science and Engineering, Hunan University of Science and Technology, Xiangtan 411201;
2 High Temperature Wear Resistant Materials and Preparation Technology of Hunan Province National Defence Science and Technology Laboratory, Xiangtan 411201;
3 Science and Technology Company Limited of No.608 Research Institute, Zhuzhou 412002;
4 Chongqing Academy of Science and Technology, Chongqing 401123 |
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Abstract The present work aimed to investigate the dynamic impact behavior of an extruded and T5-tempered Mg-8Gd-4Y-Nd-Zr alloy subjected to various strain rates by using the split Hopkinson pressure bar, hardness test, optical microscopy, scanning electron microscopy and transmission electron microscopy. Our experiment confirmed the excellent impact resistance of this extruded-T5 tempered alloy, as it exhibited the compressive strengths of 502 MPa and 682 MPa, the former of which is equivalent to 2519A aluminum alloy, when the strain rates were 771 s-1 and 2 645 s-1, respectively. It can also be concluded that the cleavage fracture is the main fracture mode of the alloy under different strain rates. A strain rate below 1 244 s-1 will result in the connection of the cleavage planes through small-sized shallow dimples, while a strain rate higher than 1 808 s-1 can lead to the intergranular fracture in fine grain region involved by grain boundary weakening, a consequence of the adiabatic temperature rise during dynamic compression, and thereby, trigger the formation of network structure.
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Published: 31 July 2018
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2018, Vol. 32 
