Ontology type: schema:ScholarlyArticle
1994-05
AUTHORSJean-Pascal Lebrat, Arvind Varma, Paul J. McGinn
ABSTRACTNickel aluminides exhibit limited ductility and toughness at room temperature. One way to improve these characteristics is by adding ceramic reinforcements to the matrix. In this paper, we have studied the combustion synthesis of Ni 3 Al and Ni 3 Al-matrix composites, using the self-propagating high-temperature synthesis (SHS) mode. First, studies of the Ni 3 Al synthesis were carried out by quenching the reaction during its progress, which revealed the mechanism of the synthesis. The influence of Al 2 O 3 and SiC whiskers or particulates, and B 4 C particulates added to the reaction mixture prior to combustion synthesis, was investigated next. It was found that, in general, reinforcements are heat sinks and limit the propagation of the reaction. Also, whiskers impede the flow of formed liquid to a larger extent than do particulates. Al 2 O 3 is inert and matrices reinforced with up to 2 wt. % Al 2 O 3 are composed essentially of Ni 3 Al grains. However, both B 4 C and SiC react with the Ni-Al matrix and lead to complex phases. In particular, B 4 C readily forms a Ni-Al-B liquid phase and disrupts dramatically the progress of the Ni 3 Al matrix synthesis. More... »
PAGES1184-1192
http://scigraph.springernature.com/pub.10.1557/jmr.1994.1184
DOIhttp://dx.doi.org/10.1557/jmr.1994.1184
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