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Title: Microstructural and mechanical characteristics of Ni–Cr thin films

Highlights: • Ni–Cr thin films of varied composition deposited by DC magnetron co-sputtering. • Thin film with Ni–Cr: 80–20 at% composition exhibits most distinct behavior. • The films were tensile tested and exhibited no cracking till the substrate yielding. - Abstract: Ni–Cr alloy thin films have been deposited using magnetron co-sputtering technique at room temperature. Crystal structure was evaluated using GIXRD. Ni–Cr solid solution upto 40 at% of Cr exhibited fcc solid solution of Cr in Ni and beyond that it exhibited bcc solid solution of Ni in Cr. X-ray diffraction analysis shows formation of (1 1 1) fiber texture in fcc and (2 2 0) fiber texture in bcc Ni–Cr thin films. Electron microscopy in both in-plane and transverse direction of the film surface revealed the presence of columnar microstructure for films having Cr upto 40 at%. Mechanical properties of the films are evaluated using nanoindentation. The modulus values increased with increase of Cr at% till the film is fcc. With further increase in Cr at% the modulus values decreased. Ni–Cr film with 20 at% Ni exhibits reduction in modulus and is correlated to the poor crystallization of the film as reflected in XRD analysis. The Ni–Cr thin filmmore » with 80 at% Ni and 20 at% Cr exhibited the most distinct columnar structure with highest electrical resistivity, indentation hardness and elastic modulus.« less
Authors:
 [1] ; ; ;  [2] ;  [1]
  1. Gas Turbine Research Establishment, DRDO, Bangalore 93 (India)
  2. Department of Instrumentation and Applied Physics, IISc, Bangalore 12 (India)
Publication Date:
OSTI Identifier:
22475787
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 66; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BCC LATTICES; BINARY ALLOY SYSTEMS; CHROMIUM COMPOUNDS; CRYSTALLIZATION; ELECTRIC CONDUCTIVITY; ELECTRON MICROSCOPY; FCC LATTICES; FIBERS; HARDNESS; MAGNETRONS; MICROSTRUCTURE; NICKEL COMPOUNDS; REDUCTION; SOLID SOLUTIONS; SPUTTERING; SUBSTRATES; SURFACES; THIN FILMS; X-RAY DIFFRACTION