Microstructure in work-hardened micro-truss materials given post-forming annealing treatments
Paper i proceeding, 2010

Micro-truss cellular materials can be used as structurally efficient cores in light-weight sandwich panels. These sandwich cores have been produced using deformation-forming approaches, which introduce plastic strain into the truss struts. While this imparted strain can be used to strengthen the overall micro-truss core, it also drives recrystallization and grain growth if sandwich panel assembly involves conventional brazing treatments that subject the truss core to elevated temperatures. In addition to losing a potential strengthening mechanism, brazing can also result in the grain size of the annealed microstructure approaching the cross-sectional dimensions of the micro-truss struts. The present study is an examination of the strut microstructures in aluminum alloy and stainless steel micro-truss materials fabricated using a deformation-forming approach, and following a post-fabrication annealing step. These results serve as a guideline for future sandwich panel thermal processing to minimize the reduction of strength due to annealing and detrimental size effects.

cellular material

Al

micro truss structure

stainless steel

EBSD

work hardening

annealing

Författare

Brandon Bouwhuis

Uta Klement

Chalmers, Material- och tillverkningsteknik, Yt- och mikrostrukturteknik

Glenn Hibbard

Proceedings of 2010 TMS Annual Meeting

Vol. CD

Ämneskategorier

Materialteknik