Enhanced hardness in epitaxial TiAlScN alloy thin films and rocksalt TiN/(Al,Sc)N superlattices | Zendy

Bivas Saha | Zendy; Samantha K. Lawrence | Zendy; Jeremy L. Schroeder | Zendy; Jens Birch | Zendy; David F. Bahr | Zendy; T. Sands | Zendy

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Enhanced hardness in epitaxial TiAlScN alloy thin films and rocksalt TiN/(Al,Sc)N superlattices

Author(s) -

Bivas Saha,

Samantha K. Lawrence,

Jeremy L. Schroeder,

Jens Birch,

David F. Bahr,

T. Sands

Publication year - 2014

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.4898067

Subject(s) - materials science , superlattice , tin , epitaxy , alloy , metallurgy , thin film , nitride , composite material , layer (electronics) , optoelectronics , nanotechnology

High hardness TiAlN alloys for wear-resistant coatings exhibit limited lifetimes at elevated temperatures due to a cubic-AlN to hexagonal-AlN phase transformation that leads to decreasing hardness. We enhance the hardness (up to 46 GPa) and maximum operating temperature (up to 1050 degrees C) of TiAlN-based coatings by alloying with scandium nitride to form both an epitaxial TiAlScN alloy film and epitaxial rocksalt TiN/(Al,Sc)N superlattices on MgO substrates. The superlattice hardness increases with decreasing period thickness, which is understood by the Orowan bowing mechanism of the confined layer slip model. These results make them worthy of additional research for industrial coating applications.

Funding Agencies|National Science Foundation; U.S. Department of Energy [CBET-1048616]; Department of Energy National Nuclear Security Administration [DE-FC52-08NA28752]; Linkoping University; Swedish Research Council (the RAC Frame Program) [2011-6505]; Swedish Research Council (Linnaeus Grant) [LiLi-NFM]

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