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Investigation of the Dislocation Density of NiCr Coatings Prepared Using PVD–LMM Technology

Micron-sized coatings prepared using physical vapor deposition (PVD) technology can peel off in extreme environments because of their low adhesion. Laser micro-melting (LMM) technology can improve the properties of the fabricated integrated material due to its metallurgical combinations. However, th...

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Autores principales: Song, Guoqing, Wei, Wentian, Shuai, Bincai, Liu, Botao, Chen, Yong
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10672866/
https://www.ncbi.nlm.nih.gov/pubmed/38005163
http://dx.doi.org/10.3390/ma16227234
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author Song, Guoqing
Wei, Wentian
Shuai, Bincai
Liu, Botao
Chen, Yong
author_facet Song, Guoqing
Wei, Wentian
Shuai, Bincai
Liu, Botao
Chen, Yong
author_sort Song, Guoqing
collection PubMed
description Micron-sized coatings prepared using physical vapor deposition (PVD) technology can peel off in extreme environments because of their low adhesion. Laser micro-melting (LMM) technology can improve the properties of the fabricated integrated material due to its metallurgical combinations. However, the microstructural changes induced by the high-energy laser beam during the LMM process have not been investigated. In this study, we used the PVD–LMM technique to prepare NiCr coatings with a controlled thickness. The microstructural changes in the NiCr alloy coatings during melting and cooling crystallization were analyzed using molecular dynamics simulations. The simulation results demonstrated that the transition range of the atoms in the LMM process fluctuated synchronously with the temperature, and the hexagonal close-packed (HCP) structure increased. After the cooling crystallization, the perfect dislocations of the face-centered cubic (FCC) structure decreased significantly. The dislocation lines were mainly 1/6 <112> imperfect dislocations, and the dislocation density increased by 107.7%. The dislocations in the twinning region were affected by the twin boundaries and slip surfaces. They were plugged in their vicinity, resulting in a considerably higher dislocation density than in the other regions, and the material hardness increased significantly. This new technique may be important for the technological improvement of protective coatings on Zr alloy surfaces.
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spelling pubmed-106728662023-11-20 Investigation of the Dislocation Density of NiCr Coatings Prepared Using PVD–LMM Technology Song, Guoqing Wei, Wentian Shuai, Bincai Liu, Botao Chen, Yong Materials (Basel) Article Micron-sized coatings prepared using physical vapor deposition (PVD) technology can peel off in extreme environments because of their low adhesion. Laser micro-melting (LMM) technology can improve the properties of the fabricated integrated material due to its metallurgical combinations. However, the microstructural changes induced by the high-energy laser beam during the LMM process have not been investigated. In this study, we used the PVD–LMM technique to prepare NiCr coatings with a controlled thickness. The microstructural changes in the NiCr alloy coatings during melting and cooling crystallization were analyzed using molecular dynamics simulations. The simulation results demonstrated that the transition range of the atoms in the LMM process fluctuated synchronously with the temperature, and the hexagonal close-packed (HCP) structure increased. After the cooling crystallization, the perfect dislocations of the face-centered cubic (FCC) structure decreased significantly. The dislocation lines were mainly 1/6 <112> imperfect dislocations, and the dislocation density increased by 107.7%. The dislocations in the twinning region were affected by the twin boundaries and slip surfaces. They were plugged in their vicinity, resulting in a considerably higher dislocation density than in the other regions, and the material hardness increased significantly. This new technique may be important for the technological improvement of protective coatings on Zr alloy surfaces. MDPI 2023-11-20 /pmc/articles/PMC10672866/ /pubmed/38005163 http://dx.doi.org/10.3390/ma16227234 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Song, Guoqing
Wei, Wentian
Shuai, Bincai
Liu, Botao
Chen, Yong
Investigation of the Dislocation Density of NiCr Coatings Prepared Using PVD–LMM Technology
title Investigation of the Dislocation Density of NiCr Coatings Prepared Using PVD–LMM Technology
title_full Investigation of the Dislocation Density of NiCr Coatings Prepared Using PVD–LMM Technology
title_fullStr Investigation of the Dislocation Density of NiCr Coatings Prepared Using PVD–LMM Technology
title_full_unstemmed Investigation of the Dislocation Density of NiCr Coatings Prepared Using PVD–LMM Technology
title_short Investigation of the Dislocation Density of NiCr Coatings Prepared Using PVD–LMM Technology
title_sort investigation of the dislocation density of nicr coatings prepared using pvd–lmm technology
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10672866/
https://www.ncbi.nlm.nih.gov/pubmed/38005163
http://dx.doi.org/10.3390/ma16227234
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