Evaluation of glass formation and critical casting diameter in Al-based metallic glasses
Evaluation of glass formation and critical casting diameter in Al-based metallic glasses
复制标题
铝基金属玻璃中玻璃形成和临界铸造直径的评估
DOI：
10.1016/j.matdes.2015.08.138
复制
发表时间：
2015-12-25
影响因子：
8.4
通讯作者：
Wang, J. Q.
中科院分区：
文献类型：
--
作者：
Liao, J. P.;Yang, B. J.;Wang, J. Q.
计算了一系列铝基玻璃成型器的临界冷却速度R-c和铜模铸造铝基大块金属玻璃(BMG)样品的冷却速度T‘。研究发现，玻璃形成能力的大小反映在R-c值的变化上，Al系玻璃成形剂Al86Ni6Y4.5Co2La1.5的R-c值最低，约为3.01×10(3)K/S。棒状样品的T‘由铸件直径D决定，当D从1 mm增加到3 mm时，T’值由7.48×10(3)K/S降至0.83×10(3)K/S。可以预测某一种富铝多元组元的临界浇注直径D-c。此外，对于Al86Ni6Y4.5Co2La1.5组分，获得了D-c高达1.5 mm的大块玻璃样品，证实了理论预测。(C)2015爱思唯尔有限公司。保留所有权利。
Critical cooling rate R-c for a series of Al-based glass formers, as well as cooling rate T' for copper-mold casting Al-based bulk metallic glass (BMG) samples, have been calculated. It is found that the glass forming ability (GFA) is reflected by the change of R-c value, and Al86Ni6Y4.5Co2La1.5 alloy, the best glass former in Al-based systems, holds the lowest R-c of about 3.01 x 10(3) K/s. The T' for the rod sample is determined by casting diameter D. When synthesizing Al-based BMGs, with the D increases from 1 mm to 3 mm, the value of T' decreases from 7.48 x 10(3) K/s to 0.83 x 10(3) K/s. Based on these calculations, the critical casting diameter D-c for a certain Al-rich multi-composition could be predicted. Further, for the composition Al86Ni6Y4.5Co2La1.5, bulk glassy sample with D-c up to 1.5 mm has been obtained, confirming the theoretical prediction. (C) 2015 Elsevier Ltd. All rights reserved.