Development of Ultra-high Mechanical Damping Structures Based on Nano-scale Properties of Shape Memory Alloys
Interim rept. 22 Jul-22 Jul 2011
UNIVERSIDAD DEL PAIS VASCO BILBAO (SPAIN) DEPT OF PHYSICS OF CONDENSED MATTER
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This report results from a contract tasking Universidad del Pais Vasco as follows The objective of the project is explore micro- and nano-scale pillars fabricated from Cu-Al-Ni shape memory alloys SMA to evaluate their potential for ultra-high mechanical damping. This study is spurned by recent discovery by the grantee that micronano pillars milled from Cu-Al-Ni SMA exhibit anomalously high mechanical damping compared to other materials. The project consists of two phases, the second being an option based on progress in the first. Phase one tasks include 1 growing oriented single crystals of Cu-Al-Ni SMA and cutting thin slides and polishing, 2 producing micro-pillar arrays on the single crystal slides by optical microlithography, 3 characterizing the microstructure and martensitic transformation of the arrays, 4 testing mechanical and damping properties of individual pillars through nano-scale test techniques and compare to previous results for pillars produced using focused ion beam, and 5 design micro-compression test for the multi-pillar array and evaluate damping performance of the arrays. If results warrant, phase two will focus on production of nano-pillars by optical interferential nanolithography and e-beam lithography and compare results of the two techniques, then characterize microstructure, martensitic transformation, and mechanical properties of the nanopillar arrays. Finally, phase two will evaluate structure and performance of stacked multi-layer arrays.
- Properties of Metals and Alloys