Thermal cycling effect on the kinetics of glass transition and crystallization of a Zr-based bulk metallic glass
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Thermal cycling effect on the kinetics of glass transition and crystallization of a Zr‑based bulk metallic glass Pan Gong1,2 · Fangwei Li1 · Geng Yin1 · Lei Deng1 · Xinyun Wang1 · Junsong Jin1 Received: 25 July 2019 / Accepted: 6 March 2020 © Akadémiai Kiadó, Budapest, Hungary 2020
Abstract We investigated the effects of thermal cycling on the kinetics of glass transition and crystallization of a classic Zr-based BMG (Vit-1) by differential scanning calorimetry (DSC). Two different thermal cycling conditions with different cycles and holding times were used. Sub–sub-Tg isothermal annealing condition was also adopted for comparison. Continuous DSC tests were conducted to calculate the activation energies of glass transition and crystallization based on different equations. Isothermal DSC tests were also conducted to further study the crystallization mechanisms in views of local Avrami exponent. Based on the experimental results, the related mechanisms have also been discussed. Keywords Bulk metallic glasses · Thermal cycling · Kinetics · Glass transition · Crystallization · Structural relaxation
Introduction Bulk metallic glasses (BMGs) are very attractive as potential advanced materials because of their unique physical and chemical properties [1, 2]. Thus, BMGs have been regarded as potential structural materials in many areas including aircraft, automobiles, cell phone parts, military equipment, medical devices, and sports apparatus. As BMGs are a class of metastable materials, for the structural application, the stability of structure and properties of BMGs in service should be taken into consideration. In the past years, the effects of many service conditions (such as fatigue load [3], impact load [4], corrosive environment [5], friction [6], and low/high temperature [7, 8]) on the structure and properties of BMGs have been studied.
* Xinyun Wang [email protected] * Junsong Jin [email protected] 1
State Key Laboratory of Materials Processing and Die and Mould Technology, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, Hubei, China
State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, Hunan, China
2
Some structural parts, such as the gas turbine components, may suffer severe thermal cycling in service, which probably affects the structural and properties of metals and alloys including BMGs [9–13]. However, the research of thermal cycling effect on the properties of BMGs was seldom reported. Wang et al. studied the effect of thermal cycling on the structure and mechanical properties of Vit 1 [12] and Ti–Zr–Be–Al [13] BMGs with a temperature variation between − 196 and 150 °C. According to their results, after at least 200 cycles, the BMG samples still possess amorphous structure and no obvious change in mechanical properties has been observed. Wang et al’s primary research is a meaningful effort, but further detailed work is still needed. For BMGs, it is necessary to understand the kinetics of glass transi
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