|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Ultrafine Grained Materials IX
||Influence of Length Scale on Mechanical Properties of Multilayered Nanocrystalline Ni-Fe at Elevated Temperature
||Jochen Michael Fiebig, Lilia Kurmanaeva, Jie Jian, Haiyan Wang, John McCrea, Enrique Lavernia, Amiya K. Mukherjee
|On-Site Speaker (Planned)
||Jochen Michael Fiebig
Multilayered structures offer unique opportunities for improving the strength and ductility of structural materials at extended interval of temperatures depending on the chosen material. By using electrodeposition (ED) sub-layer thicknesses between 5 µm and 30 nm were produced. To investigate the mechanical response and understand the underlying deformation mechanisms uniaxial tensile tests were performed at various temperatures (25-400°C) and strain rates (10-2 – 10-5). Before mechanical tests the thermal stability of specimens were studied using differential scanning calorimetry. Structural studies before and after tensile deformation were conducted using electron microscopy. Reported properties are discussed in context of bimodal microstructure of multilayered samples and contribution of each grain size regime to strength and ductility. We found that at elevated temperatures, the ductility of the specimens with small layer thicknesses increased significantly. This investigation is supported by separate ONR grants to UCD, Texas A & M University and Integran Technologies.