The effect of size and composition on the strength and hardening of Cu–Ni/Nb nanoscale metallic composites
The effect of size and composition on the strength and hardening of Cu–Ni/Nb nanoscale metallic composites
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DOI：
10.1557/jmr.2017.213
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发表时间：
2017-07
影响因子：
2.7
通讯作者：
I. Mastorakos;R. Schoeppner;B. Kowalczyk;D. Bahr
中科院分区：
文献类型：
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作者：
I. Mastorakos;R. Schoeppner;B. Kowalczyk;D. Bahr
由两个和三个不同金属交替层的双层和三层系统组成的纳米级金属材料复合材料与单相薄膜相比，硬度显着提高。这些复合材料的主要应用之一是作为技术部件的保护涂层，以延长其使用寿命，并作为永久变形载体的机械屏障。在这项工作中，我们研究了由铌 (Nb) 和铜镍 (Cu-Ni) 合金交替层制成的双层结构的强度。研究了层尺寸和成分对强度和硬化的影响以及金属-合金界面对位错运动的影响。模拟揭示了合金的原子组成与薄膜硬化之间的密切关系。该结果还与由相似结构制成的纳米柱的实验结果进行了比较，并揭示和讨论了强烈的相似性。
Nanoscale metallic material composites consisting of bilayer and trilayer systems of two and three different metallic alternating layers show significant gains in hardness over monolithic single phase films. One of the main applications of these composites can be as protective coatings to technical components to increase their lifespan acting as a mechanical barrier to the carriers of permanent deformation. In this work, we study the strength of bilayer structures made of alternating layers of niobium (Nb) and copper–nickel (Cu–Ni) alloys. The effect of the layer size and composition on strength and hardening as well as the effect of the metal–alloy interface on the dislocation motion is investigated. The simulations reveal a close relationship between the atomic composition of the alloy and the hardening of the film. The results are also compared with experimental findings on nanopillars made of similar structures, and strong similarities are revealed and discussed.