Journal
APPLIED SURFACE SCIENCE
Volume 509, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2020.145303
Keywords
AlCrN/TiSiN multilayer coating; Single-phase solid solution; Interfacial structure; Microstructure; Growth behavior
Categories
Funding
- National Natural Science Foundation of China [51641101]
- Key Research and Development Program of Jiangxi Province [20171BBH80011]
- key project of Department of Education of Guangdong Province [2016GCZX008]
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AlCrN/TiSiN nanomultilayer coatings, basically consisting of single-phase fcc-AlCrTiSiN solid solution, were prepared by co-deposition method with Al(30)Cr(70 )and Ti72Si18 targets. With substrate negative bias voltage increase from 50 V to 110 V, the hardness of nanomulitlayer coatings is increased from 32.1 GPa to 36.5 GPa, and the growth behavior changes from (2 0 0)(fcc) preferred orientation to coexistence of both (2 0 0)(fcc) and (1 1 1)(fcc) preferred orientation. Low interfacial energy supports the epitaxial growth, resulting in an increase in strain energy of coating systems due to the lattice misfit between neighboring sublayers. Increased strain energy is overcompensated by the formation of interfacial dislocations and dislocation loops as well as fcc-AlCrTiSiN nano-twins and hcp-AlN clusters at twin boundaries. Additionally, the Cr-ion etching induces to form a thin amorphous loose layer (LL) between coating and steel substrate during the pretreatment process. High substrate bias voltage promotes the transformation of amorphous phase to the (Cr,Fe)N solid solution during the coating deposition process, resulting in a notable increase in adhesion strength.
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