Advanced Engineering Materials
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- You have free access to this contentMicrostructure, Shape Memory Effect and Functional Stability of Ti67Ta33 Thin Films
Yahya Motemani, Peter M. Kadletz, Bernd Maier, Ramona Rynko, Christoph Somsen, Alexander Paulsen, Jan Frenzel, Wolfgang W. Schmahl, Gunther Eggeler and Alfred Ludwig
Article first published online: 27 FEB 2015 | DOI: 10.1002/adem.201400576
Ti–Ta thin films can be used as high-temperature micro-actuators. In this study, microstructure, shape memory effect, and functional stability of room-temperature sputter deposited Ti67Ta33 thin films are systematically investigated. The actuation response of the film actuators degrades significantly during thermal cycling. This degradation is related to the formation of nanoscale ω precipitates (5–13 nm) which form above the austenite finish temperature.
- Mechanical Characterization of Fiber Ceramics: Effect of Temperature**
Matti Järveläinen, Joonas Humalamäki, Jarmo Laakso and Erkki Levänen
Article first published online: 17 FEB 2015 | DOI: 10.1002/adem.201400512
Fibrous ceramic structures are used in thermal insulators and filters in high-temperature processes. Their mechanical properties are surprisingly complex, being governed by force fields transmitting in the net of fibers. Examining how the fibers link to each other sheds light to this quandary. Extent of linking is defined by the fiber free length (deep red), which is the distance between the closest contact points (green) of a fiber. Decrease of free length, as neighboring fibers (blue) develop contacts, explains why these structures turn rigid with heat. When analyzed with grit blasting, this can be used to discover the structure's thermal history.
- Effect of Pre-Deformation and Subsequent Aging on the Damping Capacity of Mn-20 at.%Cu-5 at.%Ni-2 at.%Fe alloy
Yan Jiazhen, Li Ning, Fu Xu, Liu Wenbo, Liu Ying and Zhao Xiuchen
Article first published online: 16 FEB 2015 | DOI: 10.1002/adem.201400507
The damping capacity of Mn-20 at.%Cu-5 at.%Ni-2 at.%Fe alloy decreases rapidly with increase in deformation degree, attributing to the rearranged martensite plates and the introduced defects which hinder the motion of the twin and phase boundaries. The damping capacity of the pre-deformed alloy can be completely or partly recovered by aging at 435 °C for 20 min.
- Thermal Stability of the Commercial Mg-PSZ Powders
Dmytro Pavlyuchkov, Stefan Martin, Benedikt Reichel, Christian Weigelt and Olga Fabrichnaya
Article first published online: 13 FEB 2015 | DOI: 10.1002/adem.201400521
Stability of the Mg-PSZ commercial powders used as reinforced ceramic components of the TRIP metal matrix composite is studied at 1350 °C. Two mechanisms of destabilization of the Mg-PSZ ceramics are proposed. Stability of the powders is mainly related to their dispersion degree.