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      Permanent link:
      https://www.ias.ac.in/article/fulltext/boms/035/05/0733-0738

    • Keywords

       

      Hard coatings; hardness; fracture toughness; Ti–Al–N.

    • Abstract

       

      Titanium aluminum nitride coatings were fabricated by a d.c.magnetron sputtering system from a Ti–Al (60/40wt%) target. Coatings were deposited on steel substrates, at a substrate temperature of 250 °C and a bias voltage of –80 V. The nitrogen flow was varied from 1.5–6 sccm and the Ar flow was kept constant at 20 sccm. The morphology and microstructure of the coatings were analysed by X-ray diffraction and scanning electron microscopy. The results of X-ray diffraction showed the presence of two cubic crystalline phases, TiN and AlN, which were confirmed by X-ray photoelectron spectroscopy. The Vicker hardness was obtained by the effective model of indentation. It was observed that the hardness of the coatings decreases from 22.8–9.5 GPa with an increased nitrogen content from 1.5–4.5 sccm. Subsequently, the hardness increased to 22.1 GPa by increasing nitrogen to 6 sccm. The behavior of hardness with grain size variation is consistent with the Hall-Peth relationship. The high value in the hardness of the coatings is mainly attributed to small grain sizes and the compressive stress present.

    • Author Affiliations

       

      J Hernández-Torres1 L García-González1 L Zamora-Peredo1 T Hernández-Quiroz1 A Sauceda-Carvajal1 P J García-Ramírez1 N Flores-Ramírez2

      1. Centro de Investigación en Micr¸o y Nanotecnología, Universidad Veracruzana, 94292, Boca del Río, Veracruz, México
      2. Faculty of Wood Engineering and Technology, University Michoacana of San Nicolás de Hidalgo, Morelia, Michoacán 58060, México

    • Dates

       
      Published
      October 2012
      Manuscript received
      22 August 2011
      Manuscript revised
      24 October 2011

  • Bulletin of Materials Science | News

    • Dr Shanti Swarup Bhatnagar for Science and Technology

      Posted on October 12, 2020

      Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
      Chemical Sciences 2020

      Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
      Physical Sciences 2020

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

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