Quantitative evaluation of critical cooling rate for metallic glasses
Quantitative evaluation of critical cooling rate for metallic glasses
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DOI：
10.1016/s0921-5093(00)01446-5
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发表时间：
2001-05-31
期刊：
影响因子：
6.4
通讯作者：
Inoue, A
中科院分区：
文献类型：
--
作者：
Takeuchi, A;Inoue, A
对于金属玻璃，定量地进行了玻璃形成的临界冷却速率R-c的评价。为氧化物玻璃提出的基本方程是改进的金属玻璃。在计算中，同时考虑了熔融合金的吉布斯自由能和原子尺寸差异的影响。对纯金属、典型玻璃形成体系和1990年以后发现的最新的具有大玻璃形成能力的金属玻璃三组进行了计算。计算结果与之前的数据一致。作为示例，R-c 代表 Ni 金属。本工作中的Co基和Pd-Gu基金属玻璃分别为9.1 x 10(8)、1.2 x 10(5)和1.6 x 10(-2) K/s，而不是之前工作中的3 x 10(10)、3.5 x 10(5)和1 x 10(-1) K/s。澄清了以下几点： (1) T-m(2)/eta表征了R-c，这是典型的低熔点且在熔点下具有高粘度的Pd-Cu基金属玻璃的特征； (2) 负混合热和原子尺寸失配高于约 1·12% 会影响 R-c 从 10(-2) 到 10(-7) 以及从 10(-1) 到 10(-2) 的降低：以及 (3) R-c 的降低被理解为液态的稳定化。 (C) 2001 Elsevier Science B.V. 保留所有权利。
Evaluation of critical cooling rate R-c for lass formation was carried out quantitatively for metallic glasses. A fundamental equation proposed for oxide glasses was modified fur metallic glasses. In the calculation both Gibbs free energy of the molten alloys and the effect of the differences in atomic size were taken into account. The calculation was carried out for three groups: pure metals, typical glass-forming systems, and the latest metallic glasses with a large glass-forming ability found after 1990. The calculated results were in agreement with previous data. As examples, the R-c for Ni metal. Co- and Pd-Gu-based metallic glasses in the present work were 9.1 x 10(8), 1.2 x 10(5) and 1.6 x 10(-2) K/s, respectively, instead of 3 x 10(10), 3.5 x 10(5) and 1 x 10(-1) K/s in the previous work. The following points are clarified: (1) T-m(2)/eta characterizes R-c as is typical for the Pd-Cu-based metallic glass with a low melting point as well as high viscosity at the melting point; (2) negative heats of mixing and atomic size mismatch above about 1 12% affect the reduction of R-c from 10(-2) to 10(-7) and from 10(-1) to 10(-2): and (3) the reduction of R-c is understood as a stabilization of liquid state. (C) 2001 Elsevier Science B.V. All rights reserved.