Shape memory thin strips produced by the twin roll casting technique

Two shape memory alloys with nominal chemical composition: Ni50Ti50 and Ni47Ti50Co3 were produced using twin roll casting technique (TRC). Relatively high cooling rate realized during solidification causes directional heat flow. In result of that, high textured strips were produced. However, the total amount of the preferentially oriented grains differs between surface and cross-section of the strip. At surface, where the crystallization of the grains is the most intensive amount of the grains can reach about 77%. At the cross-section of both strips, where the solidification rate decreased, the total amount of the textured grains was not higher than 57%.

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Texture and structure of grain boundary in Ni-Ti strip produced by twin roll casting technique

Zeitschrift für Kristallographie Supplements ◽

10.1524/zksu.2009.0044 ◽

2009 ◽

Vol 2009 (30) ◽

pp. 303-308 ◽

Cited By ~ 1

Author(s):

T. Goryczka

Keyword(s):

Grain Boundary ◽

Casting Technique ◽

Twin Roll Casting ◽

Roll Casting ◽

Twin Roll

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Texture and structure of grain boundary in Ni-Ti strip produced by twin roll casting technique

Eleventh European Powder Diffraction Conference ◽

10.1524/9783486992588-048 ◽

2009 ◽

pp. 303-308

Keyword(s):

Grain Boundary ◽

Casting Technique ◽

Twin Roll Casting ◽

Roll Casting ◽

Twin Roll

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Preparation by Twin Roll Casting and Characterization of TiNi Shape Memory Alloys Strips

Solid State Phenomena - APPLIED CRYSTALLOGRAPHY XX ◽

10.4028/3-908451-40-x.121 ◽

2007 ◽

pp. 121-126

Author(s):

Richard Portier ◽

Philippe Vermaut ◽

P. Ochin ◽

Tomasz Goryczka ◽

Jorge Malarría

Keyword(s):

Shape Memory Alloys ◽

Shape Memory ◽

Twin Roll Casting ◽

Roll Casting ◽

Twin Roll

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Load-biased martensitic transformation strain of Ti50–Ni47–Co3 strip obtained by a twin-roll casting technique

Materials Science and Engineering A ◽

10.1016/j.msea.2013.12.102 ◽

2014 ◽

Vol 597 ◽

pp. 245-252 ◽

Cited By ~ 5

Author(s):

L. Isola ◽

P. La Roca ◽

A. Roatta ◽

Ph. Vermaut ◽

L. Jordan ◽

...

Keyword(s):

Martensitic Transformation ◽

Transformation Strain ◽

Casting Technique ◽

Twin Roll Casting ◽

Roll Casting ◽

Twin Roll

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Preparation by Twin Roll Casting and Characterization of TiNi Shape Memory Alloys Strips

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.130.121 ◽

2007 ◽

Vol 130 ◽

pp. 121-126 ◽

Cited By ~ 1

Author(s):

Richard Portier ◽

Philippe Vermaut ◽

Patrick Ochin ◽

Tomasz Goryczka ◽

Jorge Malarría

Keyword(s):

Shape Memory Alloys ◽

Shape Memory ◽

Functional Properties ◽

Plane Surface ◽

Twin Roll Casting ◽

Roll Casting ◽

High Transformation ◽

Production Technologies ◽

Twin Roll

The thermoelastic martensitic transformation which gives remarkable functional properties to Shape Memory Alloys (SMA) is very sensitive to the chemistry of the alloys and to its microstructure. In many cases, especially for alloys with high transformation temperatures, applications are limited by the poor ductility. To overcome the brittleness of SMA, one approach can be effective : the development of non conventional production technologies which enable to obtain materials in forms close to requirements: strips of SMA have been prepared by Twin Roll Casting (TRC). The formation of a solid sheet with plane surface is only possible for a limited combination of the different machine parameters and they will be discussed. For comprehension of the process parameters effect, the attention will be focused on TiNi. Microstructures and functional properties will be examined in relation with the microstructures induced by the technique or after specific thermal treatment.

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