Journal
MATERIALS CHARACTERIZATION
Volume 59, Issue 3, Pages 229-240Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2006.12.012
Keywords
intermetallic compounds; microstructure; mechanical properties; metallographic; microhardness
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Thermochemical surface gas nitriding of beta 21s, Timetal 205 and a Ti-Al alloy was conducted using differential scanning calorimeter equipment, in nominally pure nitrogen at 850 degrees C and 950 degrees C ( beta 21s), 730 degrees C and 830 degrees C (Timetal 205), and 950 degrees C and 1050 degrees C (Ti-Al) for 1 h, 3 h and 5 h. X-ray diffraction analyses showed new phases formed in the nitrided layer, depending on the alloy and the time and the temperature of nitriding. Microstructures were analyzed using optical microscopy. Cross-sectional microhardness profiles of cross-sectional samples after nitriding were obtained using a Knoop indenter. (C) 2007 Elsevier Inc. All rights reserved.
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