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http://dx.doi.org/10.3365/KJMM.2011.49.10.790

Reaction Synthesis of Annealed Ni-50at%Al Powder Compact  

Cho, Yong-Jae (Foundry Technology Service Center, Korea Institute of Industrial Technology)
Lee, Han-Young (Dept. of Advanced Materials Engineering, Keimyung University)
Publication Information
Korean Journal of Metals and Materials / v.49, no.10, 2011 , pp. 790-796 More about this Journal
Abstract
To reduce the heat released during intermetallic reaction, Ni-50at%Al powder compact has been previously annealed at several conditions before the reaction. The effects of the pre-annealing conditions on the reaction synthesis process have been investigated. Experimental results show that the heat released during the reaction synthesis decreased proportionally with increase of the pre-annealing temperature and duration time. The reaction duration period was significantly increased when the intermetallics were formed in the powder compact during the pre-annealing. This was attributed to the fact that the reaction occurred by solid-state diffusion between the un-reacted elemental atoms and that the $NiAl_3$ phase formed predominantly during pre-annealing.
Keywords
intermetallics; annealing; microstructure; thermal analysis; ration synthesis;
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