Deformation mode transitions in Cu50Zr50 amorphous/Cu crystalline nanomultilayer: A molecular dynamics study
Deformation mode transitions in Cu50Zr50 amorphous/Cu crystalline nanomultilayer: A molecular dynamics study
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Cu50Zr50 非晶/Cu 晶体纳米多层膜的变形模式转变：分子动力学研究
DOI：
10.1016/j.jnoncrysol.2018.03.036
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发表时间：
2018
影响因子：
3.5
通讯作者：
Li Y L
中科院分区：
文献类型：
--
作者：
Song H Y;Wang M;Deng Q;Li Y L
非晶/晶（A/C）纳米多层膜由于其优异的力学性能引起了人们的极大兴趣。采用分子动力学方法研究了A/C CuZr/Cu纳米多层膜在拉伸载荷作用下晶化和非晶化厚度对变形机制的影响。结果表明，纳米多层膜的力学行为强烈依赖于晶相和非晶相之间的双向协同变形机制。纳米多层膜的变形行为可以通过整合不同相的厚度来控制，从而获得高强度和超塑性的多层膜材料。对于具有恒定晶体层的纳米多层膜，随着非晶厚度的减小，塑性变形从剪切带传播变为明显的界面滑移调节机制，并最终变为裂纹传播模式。对于固定非晶层厚度的纳米多层膜，随着晶层厚度的减小，纳米多层膜的力学行为从局部化转变为塑性共变形模式。本研究提出了一种在强度和延展性之间实现良好平衡的方法，这对于合成具有高强度和优异延展性的A/C纳米多层膜是有用的。
The amorphous/crystalline (A/C) nanomultilayers have been aroused great interest in people due to its first-class mechanical properties. The effects of the thickness of crystalline and amorphous on the deformation mechanism of A/C CuZr/Cu nanomultilayers under tension loading here are investigated by molecular dynamics method. The results indicate that the mechanical behavior of nanomultilayer strongly depends on the bidirectional synergistic deformation mechanism between crystal phase and amorphous phase. The deformation behavior of nanomultilayers can be controlled by integrating the thickness of different phases to achieve high strength and superplastic multilayer materials. For the nanomultilayers with constant crystal layer, the plastic deformation changes from shear band propagation to a pronounced interface slip-accommodation mechanism, and ultimately to crack propagation mode with decreasing amorphous thickness. For the nanomultilayers with fixed amorphous layer thickness, the mechanical behavior changes from localization to plastic co-deformation mode with the crystalline thickness decreases. This study proposes an approach for achieving a good balance between strength and ductility, which is useful for the synthesis of A/C nanomultilayer with high strength and predominant ductility.