Evaluation of glass-forming ability for bulk metallic glasses based on characteristic temperatures |
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| Authors: | Ping Zhang Hongqing Wei Xiaolin Wei Zhilin Long Xuping Su |
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| Institution: | 1. Institute of Fundamental Mechanics and Material Engineering, Xiangtan University, Xiangtan, Hunan 411105, China;2. Key Laboratory of Materials Design and Preparation Technology of Hunan Province, Xiangton University, Hunan 411105, China;3. Department of Mechanical and Energy Engineering, Shaoyang University, Shaoyang 422000, China;4. Faculty of Materials, Optoelectronics and Physics, Xiangton University, Xiangton, Hunan 411105, China |
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| Abstract: | A new criterion ω2, defined as Tg/(2Tx?Tg)?Tg/Tl (wherein Tg is the glass transition temperature, Tx the onset crystallization temperature, and Tl the liquidus temperature), has been proposed to assess the glass-forming ability (GFA) of bulk metallic glasses (BMGs) based on the classical crystallization theory and the crystallization resistance. The analysis indicates that the factors Tg/(2Tx?Tg) and Tg/Tl could reflect the crystallization resistance and liquid phase stability of metallic glasses, respectively. From the available experimental data in literatures, the new criterion ω2 has a better correlation with the GFA of metallic glasses than all other existing criteria such as Trg(=Tg/Tl), ΔTx(=Tx?Tg), γ(=Tx/(Tg+Tl)), ΔTrg(=(Tx ? Tg)/(Tl ? Tg)), α(=Tx/Tl), β(=Tx/Tg + Tg/Tl), δ(=Tx/(Tl ? Tg)), φ(=Trg(ΔTx/Tg)0.143), γm(=(2Tx ? Tg)/Tl), β(=Tx × Tg/(Tl ? Tx)2) and ξ(=ΔTx/Tx+Tg/Tl). It has also been demonstrated that this ω2 parameter is a simple and efficient guideline for exploring new BMG formers. |
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