Enhanced plasticity in a bulk amorphous matrix composite: macroscopic and microscopic viewpoint studies
Enhanced plasticity in a bulk amorphous matrix composite: macroscopic and microscopic viewpoint studies
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DOI：
10.1016/j.actamat.2004.09.010
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发表时间：
2005-01-03
期刊：
影响因子：
9.4
通讯作者：
Kim, HS
中科院分区：
文献类型：
--
作者：
Lee, JC;Kim, YC;Kim, HS
我们开发了（Cu(60)Zr(30)Ti(10))(0.95)Ta - 5非晶基复合材料，它是一种用微米级富Ta晶相增强的Cu基块体非晶复合材料。该复合材料的极限强度为2332 MPa，断裂应变显著提高到15.3%。对断裂的（Cu60Zr30Ti10)(0.95)Ta非晶复合材料进行宏观观察，扫描电子显微镜显示存在多个剪切带以及众多从主剪切带延伸出来的二次剪切带。另一方面，使用透射电子显微镜对断裂的复合材料进行微观观察表明，裂纹以锯齿状方式在非晶基体中扩展。宏观和微观行为，包括剪切带的形成和裂纹扩展，被认为是塑性提高的原因。为了更好地理解宏观变形行为的各个方面，例如剪切带与晶体颗粒的相互作用、剪切带的起始位置以及多个剪切带的形成，进行了基于静水压力相关材料的莫尔 - 库仑模型的有限元计算，而微观变形行为则基于在准静态压缩下析出的纳米晶的形成来解释。（C）2004 Acta Materialia Inc.，由Elsevier Ltd.出版。保留所有权利。
We developed the (CU(60)Zi(30)Ti(10))(0.95)Ta-5 amorphous matrix composite. which is a Cu-based bulk amorphous composite reinforced with a micron-sized Ta-rich crystalline phase. The composite demonstrated an ultimate strength of 2332 MPa with a dramatically enhanced fracture strain of 15.3%. Macroscopic observation of the fractured (Cu60Zr30Ti10)(0.95)Ta amorphous composites scanning electron microscopy showed the presence of multiple shear bands along with numerous secondary shear bands. which spread from the primary shear bands. On the other hand, microscopic observation of the fractured composite using, transmission electron microscopy showed that the cracks propagate through the amorphous matrix in a jagged manner. The macroscopic and microscopic behaviors, involving shear hand formation and crack propagation are believed to be responsible for the enhanced plasticity. Finite element calculations using the Mohr-Coulomb model of hydrostatic pressure dependent materials were conducted, in order to gain a better Understanding of various aspects of the macroscopic deformation behavior, such a the interaction of the shear bands with the crystalline particles, the initiation site of the shear bands. and the formation of multiple shear bands, while the microscopic deformation behavior was explained based on the formation of nanocrystallites. that had precipitated under quasistatic compression. (C) 2004 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.