Locating bulk metallic glasses with high fracture toughness Chemical effects and composition optimization
Locating bulk metallic glasses with high fracture toughness Chemical effects and composition optimization
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DOI：
10.1016/j.actamat.2010.09.025
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发表时间：
2011-01-01
期刊：
影响因子：
9.4
通讯作者：
Xu, Jian
中科院分区：
文献类型：
--
作者：
He, Qiang;Cheng, Yong-Qiang;Xu, Jian
我们在Zr-Cu-Al三元系和Zr-Ti-Cu-Al四元系中开发了具有最佳玻璃形成能力（GFA）的新型块体金属玻璃（BMG）。这些BMG的相对较大尺寸允许进行断裂韧性测试，从而发现Zr（61）T1（2）Cu（25）Al（12）（ZT 1）具有在整体BMG中最高的韧性。（疲劳预裂纹断裂韧性K-max，超过类似于100 MPa均方根m，具有如阻力曲线中所示的非线性弹性断裂行为）（TM = Co、Ni）BMG，之前已针对GFA进行了优化比较所研究的BMG，结合有关Zr基BMG的文献数据，我们已经确定了化学对BMG断裂韧性影响的趋势，特别是Al的作用以及Cu在取代Ni（或Co）时的作用。这些趋势不仅根据内部原子堆积结构来解释，但更重要的是电子结构和键的性质，根据第一-原理计算然后概述了定位具有高韧性的BMG组合物的策略。BMG韧性与剪切带行为的相关性，还讨论了泊松比（v）、剪切模量和摩尔体积的乘积（μ V-m）以及玻璃化转变温度（T-g）（C）2010 Acta Materialia Inc Published by Elsevier Ltd保留所有权利
We have developed new bulk metallic glasses (BMGs) with optimized glass-forming ability (GFA), in ternary Zr-Cu-Al and quaternary Zr-Ti-Cu-Al systems The relatively large dimensions of these BMGs permitted fracture toughness tests leading to the discovery of Zr(61)T1(2)Cu(25)Al(12) (ZT1) that has a toughness among the highest for monolithic BMGs (fatigue pre-cracked fracture toughness K-max, in excess of similar to 100 MPa root m, with a nonlinear-elastic fracture behavior as seen in the resistance curve) We have also measured the toughness for Zr-TM-Al (TM = Co, Ni) BMGs, which have previously been optimized for GFA Comparing the BMGs studied, in conjunction with literature data on Zr-based BMGs we have identified trends in chemistry effects on BMG fracture toughness, in particular the role of Al as well as the effects of Cu when substituting Ni (or Co) These trends are explained in terms of not only the internal atomic packing structure, but more importantly the electronic structure and nature of bonding in light of the first-principles calculations A strategy is then outlined to locate BMG compositions with high toughness The correlations of the BMG toughness with the shear banding behavior, the Poisson's ratio (v), the product of shear modulus and molar volume (mu V-m), and the glass transition temperature (T-g), are also discussed (C) 2010 Acta Materialia Inc Published by Elsevier Ltd All rights reserved