Induced Plasticity of a Brittle （La, Ce）-Based Bulk Metallic Glass by Surface Corrosion

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...

Full description

Saved in:
Bibliographic Details
Published in金属学报：英文版 no. 2; pp. 129 - 133
Main Author Ji-Juan Liu Ran Li Lian-Xiang Fang Ju Wang Tao Zhang
Format Journal Article
LanguageEnglish
Published 2016
Subjects
H2SO4溶液
块体金属玻璃
块体非晶合金
大块金属玻璃
室温塑性
浸泡时间
腐蚀缺陷
表面腐蚀
Online AccessGet full text

Cover

More Information
Summary: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.
Bibliography:Metallic glasses; Corrosion plastic deformation mechanism; Rapid solidification; Microstructure
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.
21-1361/TG
ISSN:1006-7191
2194-1289