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Dynamic mechanical behavior of a Zr-based bulk metallic glass during glass transition and crystallization
journal contributionposted on 2009-02-01, 00:00 authored by Qi ChaoQi Chao, Qing Wang, Yuanda Dong
The dynamic mechanical behaviors of the Zr41Ti14Cu12.5Ni8Be22.5Fe2 bulk metallic glass (BMG) during continuous heating at a constant rate were investigated. The glass transition and crystallization of the Zr-based BMG were thus characterized by the measurements of storage modulus E′ and internal friction Q −1. It was found that the variations of these dynamic mechanical quantities with temperature were interrelated and were well in agreement with the DSC trace obtained at the same heating rate. The origin of the first peak in the internal friction curve was closely related to the dynamic glass transition and subsequent primary crystallization. Moreover, it can be well described by a physical model, which can characterize atomic mobility and mechanical response of disordered condense materials. In comparison with the DSC trace, the relative position of the first internal friction peak of the BMG was found to be dependent on its thermal stability against crystallization.