Journal
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
Volume 28, Issue 5, Pages 610-615Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijrmhm.2010.05.008
Keywords
Titanium; Nitridation; Mechanical milling; Thermal analysis
Funding
- Department of Science and Technology (DST) of South Africa
- Council for Scientific and Industrial Research (CSIR), division of Materials Science and Manufacturing (MSM) in the Metals and Metals Processing (MMP) unit
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The initially globular-shaped Ti powder particles were flattened to 'pan-cake' like shape after 12, 16, and thin flakes after 20 h of mechanical milling. Although no change peak positions of HCP Ti crystal structure, the increase in peak intensity with milling time was evident. It is found that the greater surface to volume ratio of the milled Ti powders accelerated the N-2 uptake and subsequent formation of TiN at lower temperatures (884, 856 and 833 degrees C for 12, 16 and 20 h, respectively) than in the unmilled powder (similar to 1100 degrees C). Higher nitrogen content of 41-44 at.% by EDS analysis confirmed the high rate of dissolution on the milled powders. (C) 2010 Elsevier Ltd. All rights reserved.
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