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Title:Microstructure of rapidly solidified Cu-Al-Ni shape memory alloy ribbons
Authors:ID Lojen, Gorazd (Author)
ID Anžel, Ivan (Author)
ID Kneissl, Albert C. (Author)
ID Unterweger, Elfride (Author)
ID Kosec, Borut (Author)
ID Bizjak, Milan (Author)
Files:URL http://dx.doi.org/10.1016/j.jmatprotec.2005.02.196
 
Language:English
Work type:Unknown
Typology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Abstract:Cu-Al-Ni shape memory alloys (SMAs) are currently the only available high temperature SMAs, showing a good resistance against functional fatigue. In polycrystalline state, they are very brittle and exhibit, in general, only small reversible deformations. By melt spinning, thin Cu-Al-Ni ribbons can be manufactured directly from the melt. Appropriate casting parameters can ensurea single layer columnar structure with a fibre texture, which significantly increases the maximal reversible strain in longitudinal direction. Cu-Al-Ni ribbons, containing 13, 14 and 15 wt.% Al were cast by free jet melt spinning. Because of the alloys' low thermal conductivity, the cooling rate was surprisingly low - considering the crystal grain size - significantly below 103 K/s. Therefore, wide ribbons having a single layer columnar and (except the ribbons containing 13 wt.% Al) completely martensiticstructure could not be obtained. Regardless the chemical composition, the ribbons have a single layer columnar structure only if the thickness does not exceed approximately 50 m, otherwise the structure consists of at least two layers of equiaxed grains. In as-cast condition, only ribbons containing 13 wt.% Al seem to be completely martensitic. Heat treatments at temperatures up to 900 °C improved the structure of 13 and 14 wt.% Al ribbons. All ribbons exhibit one-way shape memory effect in as-cast condition. Heat-treated ribbons containing 13 wt.% Al exhibited two-way shape memory effect already after one bending and heating cycle.
Keywords:metallurgy, shape memory alloys, Cu-Al-Ni alloy, microstructure, melt spinning
Year of publishing:2005
PID:20.500.12556/DKUM-27025 New window
UDC:669.018
ISSN on article:0924-0136
COBISS.SI-ID:9607190 New window
NUK URN:URN:SI:UM:DK:SXUPLTDV
Publication date in DKUM:01.06.2012
Views:2526
Downloads:116
Metadata:XML DC-XML DC-RDF
Categories:Misc.
:
LOJEN, Gorazd, ANŽEL, Ivan, KNEISSL, Albert C., UNTERWEGER, Elfride, KOSEC, Borut and BIZJAK, Milan, 2005, Microstructure of rapidly solidified Cu-Al-Ni shape memory alloy ribbons. Journal of materials processing technology [online]. 2005. [Accessed 23 March 2025]. Retrieved from: http://dx.doi.org/10.1016/j.jmatprotec.2005.02.196
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Record is a part of a journal

Title:Journal of materials processing technology
Shortened title:J. mater. process. technol.
Publisher:Elsevier
ISSN:0924-0136
COBISS.SI-ID:30105600 New window

Secondary language

Language:English
Keywords:metalurgija, zlitine z oblikovnim spominom, zlitina Cu-Al-Ni, mikrostruktura


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