Microstructure evolution and damage mechanism of layered titanium matrix composites under tensile loading
Microstructure evolution and damage mechanism of layered titanium matrix composites under tensile loading
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DOI：
10.1016/j.msea.2020.139067
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发表时间：
2020-03
期刊：
影响因子：
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通讯作者：
Shuai Wang;Lujun Huang;L. Geng;Yuan Sun;H. Peng;S. Qu
中科院分区：
文献类型：
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作者：
Shuai Wang;Lujun Huang;L. Geng;Yuan Sun;H. Peng;S. Qu
为了更好地指导层状金属基复合材料的设计，对一种钛基层状复合材料的失效机理进行了研究。结果表明，与各层材料相比，该层状复合材料具有更好的均匀变形能力。增加硬质复合层厚度导致抗拉强度提高，但变形能力下降。 Ti层中的微裂纹提供了塑性，而复合层中独特的网络微观结构限制了网络中心区域的滑移带。这些滑移带通过网络骨架传播，导致 TiB 晶须断裂以及金属基体和 TiB 晶须之间的界面脱粘。数值模拟表明，复合层中的界面裂纹容易首先扩展。较大的复合层厚度导致裂纹更容易发生收敛，从而导致延展性随着硬质复合层厚度的增加而下降。
In order to better guide the design of layered metal matrix composites, the failure mechanism of a kind of Ti based layered composite was investigated. The results showed that this layered composites possessed better uniform deformation ability compared with the materials of each layer. Increasing the hard composite layer thickness led to the enhancement of tensile strength but descend of deformation ability. The micro-cracks in the Ti layer provided plasticity, while the unique network microstructure in the composite layer restrained the slip bands from the network central region. These slip bands propagated through network skeleton and caused TiB whiskers fracture and interface debonding between the metallic matrix and TiB whiskers. Numerical simulation indicated that interface cracks in the composite layer were prone to propagate first. Larger composite layer thickness led to crack convergence more likely to occur and thus resulted in the drop of ductility with increasing the hard composite layer thickness.