San Antonio, Texas
June 10, 2012
June 10, 2012
June 13, 2012
25.926.1 - 25.926.13
Mechanical Characterization of Sn and Shape Memory Alloy InTl Nanowires Embedded in an Aluminum Oxide Matrix Edwin A. Peraza Hernandez, Kaushik Das, and Dimitris C. Lagoudas Department of Aerospace Engineering, Texas A&M University_____________________________________________________________________________AbstractA broad range of nanotechnology applications requires one-dimensional nanostructures such asnanowires. Many of such applications require the nanowires to be arranged in an orderedmanner. In this experiment, the indentation modulus of nanowire-ceramic composites wasstudied by nanoindentation tests. The composites consisted of tin (Sn) or shape memory alloyindium-thallium (InTl) nanowires embedded in anodic aluminum oxide (AAO) films. The AAOfilms were fabricated using a two-step anodization. The mechanical pressure injection was usedto fabricate the composites. Molten Sn or InTl was injected into cylindrical pores, which werearranged along the thickness direction of the AAO films, to form the composites. Nanowires ofdifferent diameters were fabricated using AAO films with pores of different diameters. Bychanging the diameter of the nanowires, the effects of the volume fraction of nanowires on theindentation modulus were studied. Nanoindentation was performed on bulk Sn, bulk InTl, AAOfilms at different steps of the composite fabrication, and the finished composites. The loading-unloading curves from the nanoindentation tests were analyzed to characterize the elasticproperties of the specimens. The results showed that the indentation modulus of the AAO filmsdecreased after heating and pressing of the films during the fabrication process. The reasons maybe formation of nanocracks due to thermal and compressive stresses during heating and pressingof the films, respectively. The indentation modulus of the composites was lower than the bulkmetals and the AAO films with empty pores. This may be due to nanocracks formed on the AAOfilm during the crystallization of the metal inside the pores.
Peraza Hernandez, E. A., & Das, K., & Lagoudas, D. C. (2012, June), Mechanical Characterization of Sn and Shape Memory Alloy InTl Nanowires as Part of an Undergraduate Research Experience Paper presented at 2012 ASEE Annual Conference & Exposition, San Antonio, Texas. 10.18260/1-2--21683
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