Effect of 1wt%Zn Addition on Microstructure and Mechanical Properties of Mg-6Er Alloys under High Strain Rates

Metals

Wei Yu¹  Fuxing Yin²  Hui Yu²  Junchao Ren²  Xin Zhang²  Puguang Ji²  Zhifeng Wang²  Shaoming Kang²  Qingzhou Wang²  Jianhang Feng² 

[1] Hefei Nova Advanced Materials Company Ltd., Hefei 230091, China;School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China;

关键词: magnesium;    high strain rate deformation;    stacking faults;    microstructure;   

DOI  :  10.3390/met12050883

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown