Quantitative determination of free volume in Pd40Ni40P20 bulk metallic glass

Received 10 August 2009; received in revised form 2 December 2009; accepted 13 January 2010. published online 18 January 2010.

For a long time, the determination of free volume has been a challenging problem in research on metallic glasses. An approach to determine quantitatively the free volume of metallic glasses from enthalpy measurements and calibration with the equilibrium free volume was developed and validated for as-cast and annealed Pd40Ni40P20 bulk metallic glasses. The free volume change with annealing time is in good agreement with that calculated theoretically from the free volume annihilation kinetics and that deduced from the density measurement results.

Keywords: Bulk metallic glass, Differential scanning calorimetry (DSC), Suction casting, Annealing, Free volume

a Institute for Nanotechnology, Forschungszentrum Karlsruhe, P.O. Box 3640, 76021 Karlsruhe, Germany

b Institute of Materials Science and Engineering, Lanzhou University, Lanzhou 730000, China

c Joint Research Laboratory of Nanomaterials, Technishce Universität Darmstadt, Petersenstr. 23, 64287 Darmstadt, Germany

Corresponding authors.

PII: S1359-6462(10)00026-6

doi:10.1016/j.scriptamat.2010.01.025

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