Abstract
The present paper investigates the influence of Nb on microstructures and functional properties of NiTiNb shape memory alloys (SMAs). It is first outlined why SMAs for coupling devices must be characterized by a wide peak to peak hysteresis defined as the difference between the martensite peak temperature in a differential scanning calorimetry (DSC) experiment on cooling and the corresponding austenite peak temperature on subsequent heating. It is then confirmed that adding Nb to NiTi does increase the width of the hysteresis from about 40 C for the stochiometric binary alloy to in between 57 C to 82 C for ternary NiTiNb alloys, with Nb contents ranging from 5 to 21 atomic percent. The evolution of microstructure during casting and subsequent thermomechanical treatments is then investigated for NiTiNb alloys with 9 and 21 atomic percent Nb using scanning electron microscopy (SEM). The corresponding phase transformation temperatures are measured using DSC. For the NiTiNb alloy with 9 atomic percent Nb it is shown how different thermo-mechanical treatments affect phase transformation temperatures. (orig.)
Siegert, W;
Neuking, K;
Eggeler, G;
[1]
Mertmann, M
[2]
- Bochum Univ. (Germany). Inst. fuer Werkstoffe
- Memory-Metalle GmbH, Weil am Rhein (Germany)
Citation Formats
Siegert, W, Neuking, K, Eggeler, G, and Mertmann, M.
Influence of Nb content and processing conditions on microstructure and functional properties of NiTiNb shape-memory alloys.
Switzerland: N. p.,
2002.
Web.
Siegert, W, Neuking, K, Eggeler, G, & Mertmann, M.
Influence of Nb content and processing conditions on microstructure and functional properties of NiTiNb shape-memory alloys.
Switzerland.
Siegert, W, Neuking, K, Eggeler, G, and Mertmann, M.
2002.
"Influence of Nb content and processing conditions on microstructure and functional properties of NiTiNb shape-memory alloys."
Switzerland.
@misc{etde_20258687,
title = {Influence of Nb content and processing conditions on microstructure and functional properties of NiTiNb shape-memory alloys}
author = {Siegert, W, Neuking, K, Eggeler, G, and Mertmann, M}
abstractNote = {The present paper investigates the influence of Nb on microstructures and functional properties of NiTiNb shape memory alloys (SMAs). It is first outlined why SMAs for coupling devices must be characterized by a wide peak to peak hysteresis defined as the difference between the martensite peak temperature in a differential scanning calorimetry (DSC) experiment on cooling and the corresponding austenite peak temperature on subsequent heating. It is then confirmed that adding Nb to NiTi does increase the width of the hysteresis from about 40 C for the stochiometric binary alloy to in between 57 C to 82 C for ternary NiTiNb alloys, with Nb contents ranging from 5 to 21 atomic percent. The evolution of microstructure during casting and subsequent thermomechanical treatments is then investigated for NiTiNb alloys with 9 and 21 atomic percent Nb using scanning electron microscopy (SEM). The corresponding phase transformation temperatures are measured using DSC. For the NiTiNb alloy with 9 atomic percent Nb it is shown how different thermo-mechanical treatments affect phase transformation temperatures. (orig.)}
journal = []
volume = {394-395}
journal type = {AC}
place = {Switzerland}
year = {2002}
month = {Jul}
}
title = {Influence of Nb content and processing conditions on microstructure and functional properties of NiTiNb shape-memory alloys}
author = {Siegert, W, Neuking, K, Eggeler, G, and Mertmann, M}
abstractNote = {The present paper investigates the influence of Nb on microstructures and functional properties of NiTiNb shape memory alloys (SMAs). It is first outlined why SMAs for coupling devices must be characterized by a wide peak to peak hysteresis defined as the difference between the martensite peak temperature in a differential scanning calorimetry (DSC) experiment on cooling and the corresponding austenite peak temperature on subsequent heating. It is then confirmed that adding Nb to NiTi does increase the width of the hysteresis from about 40 C for the stochiometric binary alloy to in between 57 C to 82 C for ternary NiTiNb alloys, with Nb contents ranging from 5 to 21 atomic percent. The evolution of microstructure during casting and subsequent thermomechanical treatments is then investigated for NiTiNb alloys with 9 and 21 atomic percent Nb using scanning electron microscopy (SEM). The corresponding phase transformation temperatures are measured using DSC. For the NiTiNb alloy with 9 atomic percent Nb it is shown how different thermo-mechanical treatments affect phase transformation temperatures. (orig.)}
journal = []
volume = {394-395}
journal type = {AC}
place = {Switzerland}
year = {2002}
month = {Jul}
}