期刊
METALS
卷 12, 期 5, 页码 -出版社
MDPI
DOI: 10.3390/met12050883
关键词
magnesium; high strain rate deformation; stacking faults; microstructure
资金
- National Natural Science Foundation of China [51701060]
- Scientific Research Foundation for the Returned Overseas Chinese Scholars of Hebei Province under the Hebei Provincial Key Research Special Project Development and Application of Key Preparation Technology of High Strength and Toughness Magnesium Alloys f [C20190505]
- Scientific Research Foundation for the Returned Overseas Chinese Scholars of Hebei Province under the Hebei Provincial Key Research Special Project Development and Application of Key Preparation Technology of High Strength and Toughness Magnesium Alloys f [C20190505]
In this study, the high strain rate response of Mg-6wt%Er alloys with 1wt%Zn addition was investigated. It was found that the addition of Zn can enhance the strength of the alloy. The interaction between SFs and dislocations was analyzed, and it was observed that LAGBs can more easily transform into HAGBs at a high strain rate.
In this study, we investigated the high strain rate response of Mg-6wt%Er alloys with 1wt%Zn addition by split Hopkinson pressure bar (SHPB) tests in a range of 900-2500 s(-1). Their related microstructures were also characterized by optical microscopy (OM), scanning electron microscopy (SEM), electron back-scattering diffraction (EBSD), and transmission electron microscopy (TEM). In particular, the twinning and stacking faults (SFs) in Mg-6Er and Mg-6Er-1Zn alloys are characterized, and the interactions between twin/SFs and dislocations are analyzed in detail. Compared with twins, the dispersed and dense SFs seem to more readily interact with dislocations, resulting in the enhancement of the strength of alloys. Especially at a high strain rate of 1450 s(-1), dislocations are prone to tangle around the twins and SFs, forming low-angle grain boundaries (LAGBs). The addition of Zn in Mg-6Er can make LAGBs more easily transform into high-angle grain boundaries (HAGBs) due to the existence of SFs.
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