A new glass-forming ability criterion for bulk metallic glasses
A new glass-forming ability criterion for bulk metallic glasses
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DOI：
10.1016/s1359-6454(02)00166-0
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发表时间：
2002-08-01
期刊：
影响因子：
9.4
通讯作者：
Liu, CT
中科院分区：
文献类型：
--
作者：
Lu, ZP;Liu, CT
基于过冷液冷却和再加热过程中的结晶过程，提出了一种新的大块金属玻璃形成能力指标。通过与还原玻璃化转变温度T-rg （= T-g/T-l，其中T-g和T-l分别为玻璃化转变温度和液相温度）和过冷液体范围DeltaT(xg) （= T-x-T-g，其中T-x为开始结晶温度，T-g为玻璃化转变温度）的比较，阐述并讨论了这一新参数与临界冷却速率或临界截面厚度之间的相互关系。我们的研究结果表明，单独的DeltaT（xg）不能推断出bmg的相对GFA，而新的参数gamma（定义为T-x/(T-g + T-l)）与GFA的相互关系比T-rg要好得多。在大块金属玻璃中形成玻璃的临界冷却速率和临界截面厚度的近似也被制定和评估。(C) 2002年由Elsevier Science Ltd代表Acta Materialia Inc出版
A new indicator of glass-forming ability (GFA) for bulk metallic glasses (BMGs) is proposed based on crystallization processes during cooling and reheating of the supercooled liquid. The interrelationship between this new parameter and the critical cooling rate or critical section thickness is elaborated and discussed in comparison with two other representatives, i.e. reduced glass transition temperature T-rg (= T-g/T-l, where T-g and T-l are the glass transition temperature and liquidus temperature, respectively) and supercooled liquid range DeltaT(xg) (= T-x-T-g, where T-x is the onset crystallization temperature and T-g the glass transition temperature). Our results have shown that DeltaT(xg) alone cannot infer relative GFA for BMGs while the new parameter gamma, defined as T-x/(T-g + T-l), has a much better interrelationship with GFA than T-rg. An approximation of the critical cooling rate and critical section thickness for glass formation in bulk metallic glasses is also formulated and evaluated. (C) 2002 Published by Elsevier Science Ltd on behalf of Acta Materialia Inc.