Microstructure, Mechanical Properties and First Principles Calculations of Mo/VC Multilayers

In the present work, Mo/VC multilayers with constant period (10 nm) and different modulation ratios (from 6:4 to 9:1) were deposited by dc magnetron sputtering. We investigated the microstructure and mechanical properties of Mo/VC multilayers. XRD and TEM results indicated that Mo was a bcc structur...

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Bibliographic Details
Published in:Coatings (Basel) 2023-01, Vol.13 (1), p.127
Main Authors: Wang, Chen, Xu, Wenya, Li, Hongfu, Liu, Yanming, Lv, Xianghong, Liu, Wenting, Jin, Na, Tong, Lijia
Format: Article
Language:English
Subjects:
First principles
Geometry
Hardness
Interfaces
Lamellar structure
Magnetic properties
Magnetron sputtering
Mechanical properties
Microstructure
Modulation
Multilayers
Protective coatings
Residual stress
Solid lubricants
Stress concentration
Toughness
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Summary:In the present work, Mo/VC multilayers with constant period (10 nm) and different modulation ratios (from 6:4 to 9:1) were deposited by dc magnetron sputtering. We investigated the microstructure and mechanical properties of Mo/VC multilayers. XRD and TEM results indicated that Mo was a bcc structure and VC was a NaCl B1 (fcc) structure. An HRTEM image revealed the coherent interfaces between the Mo and VC layers. Hardness and toughness were studied using the Nanoindent and Microindent methods, respectively. It was found that the multilayers hardness remained as high as ~22 GPa, while the toughness increased from 2.91 to 4.70 MPa·m1/2 and the modulation ratio varied from 6:4 to 9:1. The enhancement of both hardness and toughness is attributed to the interfaces and the lamellated structure. The first-principles method was also used to determine the most stable interface model and the formation mechanism of the interface between the Mo and VC layers.
ISSN:2079-6412
2079-6412
DOI:10.3390/coatings13010127