An atomistic investigation of structural evolution in metallic glass matrix composites
An atomistic investigation of structural evolution in metallic glass matrix composites
复制标题
DOI：
10.1016/j.ijplas.2013.01.002
复制
发表时间：
2013-05
影响因子：
9.8
通讯作者：
Haofei Zhou;S. Qu;Wei Yang
中科院分区：
文献类型：
--
作者：
Haofei Zhou;S. Qu;Wei Yang
金属玻璃基复合材料具有独特的力学性能和实际应用潜力。控制这些混合结构的结构演化过程的变形机制仍然知之甚少。在这篇文章中，我们阐明的结晶第二相的金属玻璃基复合材料的拉伸行为的影响，通过使用大规模的原子模拟。我们确定，晶体第二相和本地剪切带之间的相互作用是由晶格位错的玻璃-晶体界面和离散的剪切事件在相邻的玻璃基质的合作激活为主。通过调整结晶第二相的形态，观察到局部剪切带的偏转、分叉和抑制，并成功地提高了复合结构的整体塑性。作为结论，提出了设计有效的金属玻璃第二相的指导原则。
Metallic glass matrix composites may have unique mechanical properties and potential for practical applications. Deformation mechanisms governing the structural evolution process of these mixed structures remain poorly understood. In this article, we elucidate the effect of the crystalline second phase on the tension behavior of metallic glass matrix composites by using large-scale atomistic simulations. We identify that the interaction between the crystalline second phase and the local shear bands is dominated by the cooperative activation of lattice dislocations on the glass–crystal interfaces and discrete shearing events in the neighboring glass matrix. By tailoring the morphology of the crystalline second phase, one observes deflection, bifurcation and suppression of local shear bands and succeeds in enhancing the global plasticity of the composite structure. Guiding principles aimed at designing effective crystalline second phases in metallic glasses are proposed as conclusions.