Encapsulated Zr-based bulk metallic glass with large plasticity
Encapsulated Zr-based bulk metallic glass with large plasticity
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DOI：
10.1016/j.msea.2010.12.077
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发表时间：
2011-03-15
期刊：
影响因子：
6.4
通讯作者：
Wang, Gang
中科院分区：
文献类型：
--
作者：
Chen, Wen;Chan, K. C.;Wang, Gang
在Zr57Al10Ni8Cu20Ti5块体非晶合金（BMG）表面分别以侧面镀覆、两端镀覆和完全包覆三种方式电镀铜（Cu）层。研究了这三种不同类型试样的力学性能。结果表明，在Cu涂层的侧向约束作用下，与未涂层试样的塑性差（约2%）相比，侧面涂层试样具有较高的塑性，在破坏前塑性应变约为6.5%。由于消除了压板和试样之间的摩擦，两端涂覆的试样进一步显示出类似于13%的更大塑性。最有趣的是，在完全封装的试样中获得了类似于20%的最大塑性应变。这种塑性的急剧增加被认为是由于摩擦边界条件的变化，侧向围压应力和变形引起的非均匀组织。(C)2010 Elsevier B.V.保留所有权利。
Copper (Cu) coatings were electroplated onto Zr57Al10Ni8Cu20Ti5 bulk metallic glass (BMG) in three different ways: laterally coated, two ends coated, and completely wrapped/encapsulated. The mechanical behavior of these three different types of specimen were investigated. The results show that, as compared to the poor ductility (similar to 2%) of the uncoated specimen, the side surface coated specimen exhibits a higher ductility of around 6.5% plastic strain before failure, under the effect of the lateral confinement by the Cu coating. Thanks to the elimination of friction between the platens and the specimen, the two ends coated specimen further demonstrates a larger plasticity of similar to 13%. Most interestingly, the largest plastic strain of similar to 20% was obtained in the completely encapsulated specimen. This drastic increase in plasticity is believed to originate from the changes of the frictional boundary conditions, the lateral confining stress and the deformation induced heterogeneous microstructure. (C) 2010 Elsevier B.V. All rights reserved.