Studies on mechanical properties of thermoelectric materials by nanoindentation
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE(2015)
Abstract
In order to fabricate durable and efficient thermoelectric generators (TEG) for applications like automobile waste heat recovery, where thermal stress is a major concern, one needs to assess the mechanical performance of the TE materials. This work reports the hardness and elastic modulus of the moderate temperature range (200-1000 degrees C) TE materials, including half-Heusler, skutterudites, bismuth telluride, silicon germanium alloys, and lead selenide, using nanoindentation and atomic force microscopy (AFM). The p-type half-Heusler exhibits considerably higher hardness and modulus values, and lower brittleness as compared with other materials, which may be indicative of its more robust mechanical performance.
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Key words
hardness,mechanical properties,nanoindentation,thermoelectric materials
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