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

Abstract

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]; ;  [1]; ;  [2];  [1]
  1. School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907 (United States)
  2. 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
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 105; Journal Issue: 15; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0003-6951
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

Citation Formats

Saha, Bivas, Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, Lawrence, Samantha K., Bahr, David F., Schroeder, Jeremy L., Birch, Jens, Sands, Timothy D., Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, and School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907. Enhanced hardness in epitaxial TiAlScN alloy thin films and rocksalt TiN/(Al,Sc)N superlattices. United States: N. p., 2014. Web. doi:10.1063/1.4898067.
Saha, Bivas, Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, Lawrence, Samantha K., Bahr, David F., Schroeder, Jeremy L., Birch, Jens, Sands, Timothy D., Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, & School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907. Enhanced hardness in epitaxial TiAlScN alloy thin films and rocksalt TiN/(Al,Sc)N superlattices. United States. https://doi.org/10.1063/1.4898067
Saha, Bivas, Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, Lawrence, Samantha K., Bahr, David F., Schroeder, Jeremy L., Birch, Jens, Sands, Timothy D., Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, and School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907. Mon . "Enhanced hardness in epitaxial TiAlScN alloy thin films and rocksalt TiN/(Al,Sc)N superlattices". United States. https://doi.org/10.1063/1.4898067.
@article{osti_22350891,
title = {Enhanced hardness in epitaxial TiAlScN alloy thin films and rocksalt TiN/(Al,Sc)N superlattices},
author = {Saha, Bivas and Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907 and Lawrence, Samantha K. and Bahr, David F. and Schroeder, Jeremy L. and Birch, Jens and Sands, Timothy D. and Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907 and School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907},
abstractNote = {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.},
doi = {10.1063/1.4898067},
url = {https://www.osti.gov/biblio/22350891}, journal = {Applied Physics Letters},
issn = {0003-6951},
number = 15,
volume = 105,
place = {United States},
year = {2014},
month = {10}
}