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Microstructure of rapidly solidified Cu-Al-Ni shape memory alloy ribbonsLojen, Gorazd ...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.Vir: Journal of materials processing technology. - ISSN 0924-0136 (Vol. 162/163, May 2005, str. 220-229)Vrsta gradiva - članek, sestavni delLeto - 2005Jezik - angleškiCOBISS.SI-ID - 9607190
Avtor
Lojen, Gorazd |
Anžel, Ivan, inženir metalurgije in materialov |
Kneissl, Albert C. |
Unterweger, E. |
Kosec, Borut |
Bizjak, Milan, 1955-
Teme
metalurgija |
zlitine z oblikovnim spominom |
zlitina Cu-Al-Ni |
mikrostruktura |
metallurgy |
shape memory alloys |
Cu-Al-Ni alloy |
microstructure |
melt spinning
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vir: Journal of materials processing technology. - ISSN 0924-0136 (Vol. 162/163, May 2005, str. 220-229)
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Lojen, Gorazd | 11951 |
Anžel, Ivan, inženir metalurgije in materialov | 10369 |
Kneissl, Albert C. | ![]() |
Unterweger, E. | ![]() |
Kosec, Borut | 11624 |
Bizjak, Milan, 1955- | 06073 |
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