Grain and interface boundaries governed strengthening mechanisms in metallic multilayers
Grain and interface boundaries governed strengthening mechanisms in metallic multilayers
复制标题
DOI：
10.1016/j.jallcom.2016.12.254
复制
发表时间：
2017-03
影响因子：
6.2
通讯作者：
Qing Zhou;P. Huang;Mabao Liu;Fei Wang;K. Xu;T. Lu
中科院分区：
文献类型：
--
作者：
Qing Zhou;P. Huang;Mabao Liu;Fei Wang;K. Xu;T. Lu
为了调整工程材料的力学性能，操纵其内部边界，如颗粒/界面边界(GBS/IBS)是一种标准做法。通过对铜/铝、铜/钨等双金属多层膜体系硬度的重新评估，我们证明了除了IBS外，GBs对多晶多层膜的强化过程也有贡献。通过详细分析面心立方/体心立方(FCC/BCC)多层膜中IBS和GBS之间的耦合和竞争效应，实验表明，面心立方/体心立方(FCC/BCC)多层膜系统中非相干IBS的强度贡献比BCC和FCC/FCC多层膜的强度低。根据已有的数据和理论，提出界面剪切是非共格IBS的主要机制，对非共格IBS的“弱化效应”提供了合理的解释。
To tailor the mechanical properties of an engineering material, manipulating its internal boundaries such as grain/interface boundaries (GBs/IBs) is a standard practice. Upon reevaluating the hardness of Cu/Al, Cu/W and other bimetallic multilayer systems, we demonstrated that apart from IBs, GBs also contribute to the strengthening process of polycrystalline multilayers. By analyzing in detail the coupling and competing effects between IBs and GBs, we revealed experimentally that the strength contributed from incoherent IBs inface-centered cubic/body-centered cubic(fcc/bcc) multilayer systems is lower than that from bcc GBs and fcc/fcc IBs. In light of existing data and theory, interface shear was proposed as the main mechanism, providing reasonable explanation of the “weakening effects” of incoherent IBs.