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Published June 2010 | Published
Journal Article Open

Deformation and crystallization of Zr-based amorphous alloys in homogeneous flow regime


The purpose of this study is to experimentally investigate the interaction of inelastic deformation and microstructural changes of two Zr-based bulk metallic glasses (BMGs): Zr_(41.25)Ti_(13.75)Cu_(12.5)Ni_(10)Be_(22.5) (commercially designated as Vitreloy 1 or Vit1) and Zr_(46.75)Ti_(8.25)Cu_(7.5)Ni_(10)Be_(27.5) (Vitreloy 4, Vit4). High-temperature uniaxial compression tests were performed on the two Zr alloys at various strain rates, followed by structural characterization using differential scanning calorimetry (DSC) and transmission electron microscopy (TEM). Two distinct modes of mechanically induced atomic disordering in the two alloys were observed, with Vit1 featuring clear phase separation and crystallization after deformation as observed with TEM, while Vit4 showing only structural relaxation with no crystallization. The influence of the structural changes on the mechanical behaviors of the two materials was further investigated by jump-in-strain-rate tests, and flow softening was observed in Vit4. A free volume theory was applied to explain the deformation behaviors, and the activation volumes were calculated for both alloys.

Additional Information

© 2010 Materials Research Society. Received 11 July 2009; accepted 4 January 2010. The research reported here was supported by the National Science Foundation MRSEC Program by a grant (No. 0520565) to the Center for Science and Engineering of Materials at the California Institute of Technology and is gratefully acknowledged. The authors thank Mr. Petros Arakelian for his help with the mechanical testing.

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