Physical factors controlling the ductility of bulk metallic glasses

Liu, Y.; Wu, H.; Liu, C. T.; Zhang, Z.; Keppens, V.
October 2008
Applied Physics Letters;10/13/2008, Vol. 93 Issue 15, p151915
Academic Journal
In order to identify key physical factor controlling the deformation and fracture behavior of bulk metallic glasses (BMGs), we compiled and analyzed the elastic moduli and compressive ductility for BMGs. In addition, new modulus data were generated in the critical ranges in order to facilitate the analysis. We have found that the intrinsic ductility of BMGs can be correlated with the bulk-to-shear modulus ratio B/G according to Pugh’s [Philos. Mag. 45, 823 (1954)] rule. In some individual BMG systems, for example, Fe based, the relationship seems to be very clear. The physical meaning of this correlation is discussed in terms of atomic bonding and connectivity.


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