Journal
SCRIPTA MATERIALIA
Volume 53, Issue 12, Pages 1433-1437Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2005.08.014
Keywords
titanium boride; metal-matrix composites; laser deposition; rapid solidification; nanometer precipitates
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Metal-matrix composites based on boride reinforcements in a titanium base matrix have been deposited in situ from a powder feed-stock consisting of a blend of Ti-alloy and elemental boron powders using the laser engineered net-shaping (LENS (TM)) process. These composites exhibit a homogeneous multi-scale microstructure consisting of micron to sub-micron as well as nanometer scale TiB precipitates in a metal matrix. While the coarser precipitates result from rapid solidification of the liquid, the nanometer-scale precipitates are likely to form from the solid-state decomposition of a boron supersaturated Ti-base matrix. Such nanometer-scale TiB precipitates call play a prominent role in determining the mechanical properties of these composites. (c) 2005 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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