We present evidence that a minor adjustment in Zr/Ni concentration ratio can dramatically enhance the plasticity of monolithic Zr-based bulk metallic glasses (BMGs) from about 2.2% for Zr65Al8Ni10Cu17 BMG to 14% for Zr62Al8Ni13Cu17 BMG. No deformation-induced nanocrystallization appears in a 55% strained Zr62Al8Ni13Cu17 BMG without catastrophic failure while pre-existing nanocrystals in Zr65Al8Ni10Cu17 BMG result in its limited plasticity. Also note that the stability of Zr62Al8Ni13Cu17 BMG against crystallization upon deformation is somewhat higher than that of Zr65Al8Ni10Cu17 BMG. As determined by x-ray diffraction using synchrotron radiation, the enhanced plasticity of Zr62Al8Ni13Cu17 BMG seems to be related to the relative homogeneity of the amorphous structure.
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The authors would like to thank the HASYLAB staff at Hamburg, Germany, for the assistance during the measurements at BW5. Financial support from the National Natural Science Foundation of China (Grant Nos. 50425102 and 50601021), the Ministry of Science and Technology of China (Grant Nos. 2004/249/37-14 and 2004/250/31-01A), the Ministry of Education of China (Grant Nos. 2.005E+10 and 2005-55), Zhejiang University-Helmholtz cooperation, and the EU-project (Ductile BMG Composites MRTN-CT-2003-504692) is gratefully acknowledged.
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Wang, X.D., Yang, L., Jiang, J.Z. et al. Enhancement of plasticity in Zr-based bulk metallic glasses. Journal of Materials Research 22, 2454–2459 (2007). https://doi.org/10.1557/jmr.2007.0324