Effect of the grain size and distribution of nanograins on the deformation of nanodomained heterogeneous nickel
Effect of the grain size and distribution of nanograins on the deformation of nanodomained heterogeneous nickel
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DOI：
10.1016/j.matlet.2018.11.045
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发表时间：
2019-02
影响因子：
3
通讯作者：
Tianju Chen;Caizhi Zhou
中科院分区：
文献类型：
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作者：
Tianju Chen;Caizhi Zhou
通过一种新的离散晶体塑性模型，研究了嵌入纳米颗粒对纳米异质镍(Ni)强度和变形的影响。纳米结构表现出比非均相层状结构和混合规则更高的强度。由于纳米颗粒和粗晶之间的强度不匹配，几何必要位错(GND)在纳米颗粒周围积累，并随着应变的增加而增加。此外，更小的纳米颗粒更能有效地在纳米域和非均相层片状结构中生成GND。这些发现揭示了位错机制在异质纳米结构金属塑性中的作用。
We studied the effect of embedded nanograins on the strength and deformation of nanodomained heterogeneous nickel (Ni) via a novel discrete-crystal plasticity model. Nanodomained structures exhibited higher strength than those of heterogeneous lamella structures and rule of mixtures. Due to the mismatch of strengths between the nanograins and coarse grains, geometrically necessary dislocations (GND) accumulated around nanograins and increased with the strain. In addition, smaller nanograins are more effective to generate GND in both nanodomained and heterogeneous lamella structures. These findings shed light on the role of dislocation mechanisms in the plasticity of heterogeneous nanostructured metals.