Ji-Juan Liu
,
Ran Li
,
Lian-Xiang Fang
,
Ju Wang
,
Tao Zhang
金属学报(英文版)
doi:10.1007/s40195-016-0368-3
Unexpected facture without any room-temperature plasticity severely limits potential structural applications of bulk metallic glasses (BMGs), especially La-, Mg- and Fe-based ones. In this study, a simple free corrosion method was provided to improve the plasticity of a brittle (La, Ce)-based BMG by the introduction of high-density corrosion defects on the surface. The influences of immersing time in 0.1 mol/L H2SO4 aqueous solution on the surface morphology and mechanical properties of the BMG were evaluated. With increasing immersing time from 5 to 30 min, the degree of surface corrosion increased obviously, and the distribution of corrosion defects became more homogenous. In the samples, the yielding phenomenon and certain plasticity appeared up to 0.3% after the surface treatment. The yielding and plasticity can be attributed to easier nucleation of shear bands on the defect surface rather than on the glabrous surface. The results provided a novel method to improve the plasticity of BMGs.
关键词:
Metallic
,
glasses
,
Corrosion
,
plastic
,
deformation
,
mechanism
,
Rapid
,
solidification
,
Microstructure
