Effect of annealing and cobalt content on relaxation and crystallization behavior of zirconium based bulk metallic glasses
Institute of Micro and Nanomaterials, University of Ulm, Albert-Einstein Allee 47, 89081 Ulm, Germany
* Corresponding author: email@example.com
Published online: 21 August 2017
The effects of annealing and cobalt content on relaxation and the crystallization process of Zr64Ni10Al7Cu19 bulk metallic glasses were investigated. β-relaxation occurs during annealing, leading to increased endotherm before crystallization. α-relaxation during high temperature annealing (higher than Tg) affects the crystallization process. The introduction of cobalt leads to an inhomogeneous amorphous structure and two-step crystallization due to the positive mixing enthalpy between cobalt and copper. Non-affine thermal strain arising from low temperature annealing of heterogeneous structure leads to a reduced endotherm phenomenon during relaxation on the DSC curves and a reduction in hardness.
© The Authors, published by EDP Sciences, 2017
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