Abstract
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.
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Acknowledgments
This work was financially supported by the National Natural Science Foundation of China (Nos. 51131002 and 51301196), the Fok Ying-Tong Education Foundation for Young Teachers in the Higher Education Institutions of China (No. 142008), the Fundamental Research Funds for the Central Universities (No. YWF-15-CLXY-002), and the Scientific Research Foundation for the Returned Overseas Chinese Scholars of State Education Ministry.
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Liu, JJ., Li, R., Fang, LX. et al. Induced Plasticity of a Brittle (La, Ce)-Based Bulk Metallic Glass by Surface Corrosion. Acta Metall. Sin. (Engl. Lett.) 29, 129–133 (2016). https://doi.org/10.1007/s40195-016-0368-3
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DOI: https://doi.org/10.1007/s40195-016-0368-3