Scattering mechanical performances for brittle bulk metallic glasses

作者：Qiao, J. W.^*; Meng, M. M.; Wang, Z. H.; Huang, C. J.; Li, R.; Wang, Y. S.; Yang, H. J.; Zhang, Y.; Li, L. F.

来源：AIP Advances, 2014, 4(11): 117107.

DOI：10.1063/1.4901280

• CRYOGENIC TEMPERATURES
• COMPRESSIVE BEHAVIOR
• DYNAMIC COMPRESSION
• MATRIX COMPOSITES
• DEFORMATION
• MICROSTRUCTURE
• PLASTICITY
• FAILURE

Scattering mechanical performances of brittle La- and Mg-based BMGs are found in the present study. Upon dynamic loading, there exist largely scattered fracture strengths even if the strain rates are under the same order, and the BMG systems are the same. The negative strain rate dependence for La-and Mg-based BMGs is obtained, i. e., a decreased fracture strength is dominating from quasi-static to dynamic compression. At cryogenic temperatures, distinguishingly low fracture strengths are available for these two brittle BMGs, and decreased tolerance to accommodate strains makes BMGs more and more brittle. It is concluded that the scattering mechanical performances of brittle BMGs should be carefully evaluated before actual applications.

• 出版日期2014-11
• 单位太原理工大学; 中国科学院理化技术研究所; 北京航空航天大学