期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2022.143204
关键词
Nanocrystalline coatings; Sputtering power; Grain size; Strengthening mechanism; Elastic modulus
类别
资金
- National Natural Science Foundation of China [U2067219, U20B2027, 52001247, 92163201]
- 111 Project 2.0 of China [BP2018008, BX20190266]
- China Postdoctoral Science Foundation [2019M663689]
This study investigates the effect of sputtering power on the microstructure and mechanical properties of nanocrystalline Cr coatings prepared by magnetron sputtering. The experimental results show that increasing the sputtering power leads to changes in surface morphology and grain size, as well as an increase in hardness and elastic modulus. The size-dependent strengthening behavior can be explained using the classical Hall-Petch theory.
A significant sputtering power effect on the microstructure and mechanical properties was investigated in the nanocrystalline Cr coatings that were prepared by employing magnetron sputtering. Experimental results demonstrated that all the Cr coatings exhibited a columnar grain structure with preferred (110) out-of-plane orientation. However, with raising the sputtering power from 50 to 250 W, the surface morphology changed from the faceted pyramid to vermiform-like shape due to the anisotropy of growth rate along different crystallographic plane. Meanwhile, raising sputtering power also increased the grain size and coating thickness, between of which followed a power-law relationship, indicative of an evolutionary overgrowth mechanism. In addition, both the nanoindentation hardness and elastic modulus of Cr coatings exhibited a monotonic increment with reducing the grain size. This size-dependent strengthening behavior was rationally interpreted by the classical Hall-Petch theory, and a grain coalescence model for columnar grain morphology was developed to quantitatively describe the size effect on elastic modulus of nanocrystalline Cr coatings.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据