|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Mechanical Behavior at the Nanoscale III
||W-24: The Effect of a Strut Size on the Strength of Nanoporous Cu Foams
||Seungjin Nam, Junyeon Hwang, Hyunjoo Choi
|On-Site Speaker (Planned)
Although the size of struts plays a key role in mechanical load-bearing behavior of nano foams, analytical models to describe their mechanical behaviors have less been focused. The present research aims to measure strength of nanoporous Cu (NP Cu) with various porosities and strut sizes using a depth-sensing nano-indentation and to develop a mathematical model to describe the combined effect of porosity and size on the strength of NP Cu. NP Cu was produced by chemical dealloying of mechanically alloyed Al-Cu precursors. The strut size was controlled by changing compositions of the precursor and dealloying temperatures. The yield strength of NP Cu increases with decreasing porosity and strut size. Based on this measurement, models that describe the relationship between the porosity and strength (i.e., the Gibson-Ashby and Exner-Pohl models) were modified by regarding the size effect on deformation mechanisms (i.e., Hall-Petch and deformation-twinning mechanisms).
||Planned: A print-only volume