2016 | OriginalPaper | Chapter
Effect of Titanium and Chromium on the Microstructure of Tungsten-Manganese Alloys Prepared by Mechanical Alloying
Authors : O. S. Elsebaie, K. M. Jaansalu
Published in: TMS 2015 144th Annual Meeting & Exhibition
Publisher: Springer International Publishing
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Alloys of tungsten 20% manganese 17% titanium and tungsten 18% manganese 17% chromium (at%) were prepared by mechanical alloying and sintering from 1225 to 1425°C. The microstructures were examined by XRD and SEM/EDS. In the titanium-containing alloy, XRD patterns revealed peaks related to TiN and MnTi2O4. In the chromium-containing alloy, peaks related to a chromium-rich phase and MnCr2O4 were observed. SEM backscattered images of the titanium-containing alloys depicted two distinct phases: a tungsten-rich phase and a manganese-titanium oxide. The addition of titanium increased the solubility of manganese in the tungsten-rich phase, compared to tungsten-manganese alloys, to 6.3 at% Mn with 3.9 at% Ti after sintering at 1275°C for 30 min. Alternatively, the addition of chromium produced no significant improvement in the solubility of manganese; however, the solubility measurements were more consistent. Although the microstructural constituents of both alloys underwent grain growth at higher sintering temperatures, the microstructure remained relatively fine.