Correlation between plasticity and fragility in Mg-based bulk metallic glasses with modulated heterogeneity

E. S. Park, J. Y. Lee, D. H. Kim, A. Gebert, L. Schultz

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A correlation between the kinetic fragility index (m) and enhanced plasticity is presented in Mg-based bulk metallic glasses (BMGs) with modulated heterogeneity by both suitable minor addition and optimal cooling rate. As case study, with minor addition of Gd in Mg65Cu7.5Ni 7.5Zn5Ag5Y10-xGdx BMG, plasticity as well as glass-forming ability improves in a wide composition range (2.5≤x≤7.5 at. %). Furthermore, the cooling rate can affect the structural heterogeneity and the deformability of BMGs. With increasing diameters for the alloy x=5, the compressive fracture strain increases from 2.97% at d=1 mm up to 3.74% at d=2 mm and then largely decreases. In particular, the variation of heterogeneity, which can directly affect in the property of BMG, can be evaluated by comparing the m values reflecting the inherent structure of BMGs. This concept can be used as a means of guiding alloy design and processing to alleviate brittleness of BMGs.

Original languageEnglish
Article number023520
JournalJournal of Applied Physics
Issue number2
Publication statusPublished - 2008 Aug 12


All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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