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

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 °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.
Authors:
 [1] ;  [2] ; ;  [1] ; ;  [3] ;  [1] ;  [2] ;  [2]
  1. School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907 (United States)
  2. (United States)
  3. Thin Film Physics Division, Department of Physics, Chemistry, and Biology (IFM), Linköping University, SE-581 83 Linköping (Sweden)
Publication Date:
OSTI Identifier:
22350891
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 15; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ALUMINIUM COMPOUNDS; EPITAXY; HARDNESS; LAYERS; LIFETIME; MAGNESIUM OXIDES; NITROGEN COMPOUNDS; PHASE TRANSFORMATIONS; PRESSURE RANGE GIGA PA; QUATERNARY ALLOY SYSTEMS; SCANDIUM COMPOUNDS; SUPERLATTICES; SURFACE COATING; THICKNESS; THIN FILMS; TITANIUM COMPOUNDS; TITANIUM NITRIDES; WEAR RESISTANCE