Published August 2019 | Version v1
Journal article Metadata-only

Surface characterization of the cyclically oxidized γ-Ti-48Al-2Nb-0.7Cr alloy after nitridation

Creators

  • 1. Department of Material Science and Metallurgical Engineering, Faculty of Engineering, Built Environment and Information Technology, University of Pretoria (South Africa)
  • 2. Council of Scientific Industrial Research, Materials Science and Manufacturing, Light Metals, Meiring Naude Road, P O Box 395, Pretoria (South Africa)

Description

Highlights: • Ti-48Al-2Nb-0.7Cr intermetallic alloy was coated at 900 °C under nitrogen. • The surface hardness was improved due to nitridation. • Ti-48Al-2Nb-0.7Cr cyclic oxidation significantly improved. • The scale was comprised of FCC and tetragonal crystal structures. • AFM images revealed oxynitride multilayers layers. -- Abstract: Surface properties of the nitrided γ-Ti-48Al-2Nb-0.7Cr intermetallic alloy after cyclic oxidation was characterized. The nitride coating was successfully deposited after annealing of the Ti-48Al-2Nb-0.7Cr intermetallic alloy at 900 °C under nitrogen atmosphere. As a result, the nitride layer on the Ti-48Al-2Nb-0.7Cr alloy significantly improved its cyclic oxidation and the best performance was recorded at 900 °C after 900 h (h). Atomic force spectroscopy (AFM) analysis confirmed the surface multi-layers with surface roughness and a spectral root mean square (RMS) amplitude of 165 nm. Microstructures were analysed employing scanning electron microscopy (SEM) equipped with energy dispersion spectroscopy (EDS) for micro-analysis. Phase analysis was conducted using X-ray diffraction (XRD).

Additional details

Identifiers

DOI
10.1016/j.matchar.2019.05.036;
PII
S1044580318333540;

Publishing Information

Journal Title
Materials Characterization
Journal Volume
154
Journal Page Range
p. 94-102
ISSN
1044-5803
CODEN
MACHEX

INIS

Country of Publication
United States
Country of Input or Organization
International Atomic Energy Agency (IAEA)
INIS RN
55031335
Subject category
S36: MATERIALS SCIENCE;
Descriptors DEI
ANNEALING; ATOMIC FORCE MICROSCOPY; COATINGS; FCC LATTICES; HARDNESS; INTERMETALLIC COMPOUNDS; LAYERS; MICROSTRUCTURE; NITRIDATION; NITRIDES; NITROGEN; OXIDATION; OXYGEN COMPOUNDS; PERFORMANCE; PHASE STUDIES; SCANNING ELECTRON MICROSCOPY; SPECTROSCOPY; SURFACE COATING; SURFACES; X-RAY DIFFRACTION
Descriptors DEC
ALLOYS; CHEMICAL REACTIONS; COHERENT SCATTERING; CRYSTAL LATTICES; CRYSTAL STRUCTURE; CUBIC LATTICES; DEPOSITION; DIFFRACTION; ELECTRON MICROSCOPY; ELEMENTS; HEAT TREATMENTS; MECHANICAL PROPERTIES; MICROSCOPY; NITROGEN COMPOUNDS; NONMETALS; PNICTIDES; SCATTERING; THREE-DIMENSIONAL LATTICES

Optional Information

Copyright
Copyright (c) 2019 Published by Elsevier Inc.