Article (Scientific journals)
Al/stainless-invar composites with tailored anisotropy for thermal management in light weight electronic packaging
Ryelandt, Sophie; Mertens, Anne; Delannay, Francis
2015In Materials and Design, 85, p. 318-323
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Keywords :
Metal matrix composites; Interface; Thermomechanical Properties; Anisotropy; Squeeze casting
Abstract :
[en] Composite plates in which the low CTE phase has the shape of a honeycomb are anticipated to present optimum anisotropy of thermal expansion and thermal conductivity for baseplates in electronic packaging. This design is explored by choosing an invar alloy for the low CTE phase. In order to allow the formation of a passivation layer protecting from reaction with liquid Al during squeeze casting, the honeycomb is made of the Cr-rich alloy commonly called “stainless-invar”. Composite plates containing 20vol% and 38vol% stainless invar were processed using honeycombs with the same thickness over cell side ratio. Experimental CTE values are significantly lower than the predictions of three different thermo-elastic models. The very limited amplitude of the strain hysteresis precludes the occurrence of global plastic yielding in the matrix. It appears that, owing to the high contiguity of the low CTE phase, the low value of the experimental CTE results from void closing and opening by localised plastic flow. A honeycomb volume fraction of 38% is necessary for bringing the average CTE down to the level suitable for packaging applications. The ratio of transverse thermal conductivity to density then amounts to about half of the performance of the best Al/SiC composites.
Disciplines :
Materials science & engineering
Author, co-author :
Ryelandt, Sophie;  Université Catholique de Louvain - UCL > Institute of Mechanics, Materials and Civil Engineering > IMAP
Mertens, Anne  ;  Université de Liège > Département d'aérospatiale et mécanique > Science des matériaux métalliques
Delannay, Francis;  Université Catholique de Louvain - UCL > Institute of Mechanics, Materials and Civil Engineering > IMAP
Language :
English
Title :
Al/stainless-invar composites with tailored anisotropy for thermal management in light weight electronic packaging
Publication date :
2015
Journal title :
Materials and Design
ISSN :
0264-1275
eISSN :
1873-4197
Publisher :
Elsevier, Amsterdam, Netherlands
Volume :
85
Pages :
318-323
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 08 July 2015

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