Shape Flow Casting and In-rotating-liquid-spinning Processes for the Continuous Production of Wires and of High-strength and Soft Magnetic Metallic Fibres

Frommeyer, G.; Gnauk, J.; Frech, W.; Zeller, S.

doi:10.2355/isijinternational.46.1858

ISIJ Int.

2006

DOI: 10.2355/isijinternational.46.1858

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Shape Flow Casting and In-rotating-liquid-spinning Processes for the Continuous Production of Wires and of High-strength and Soft Magnetic Metallic Fibres

G. Frommeyer¹,

J. Gnauk²,

W. Frech

et al.

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2016

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“…For non-SMA alloys, detailed analyses of INROWASP processing parameters on fiber quality and various morphological characteristics are available in the literature [3][4][5][6][7][8]. The processing parameters, specifically including the ejection pressure, nozzle size, wheel speed, and ejection temperature, operate collectively to produce a corresponding cast fiber diameter and microstructure.…”

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Melt-cast microfibers of Cu-based shape memory alloy adopt a favorable texture for superelasticity

Tunçer

Schuh

2016

Scripta Materialia

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Continuous production of shape memory alloy (SMA) fibers and microfibers is a non-trivial task due to the challenges associated with their undeformed memory and, for many copper-based SMAs, brittleness in non-engineered forms. Here we demonstrate the direct continuous casting of super-meter-scale Cu-based SMA microfibers into a desirable oligocrystalline microstructure that is not brittle. The melt-casting process used here develops a favorable texture as well, leading to large superelastic strains (above 8 %), beyond what is typical for non-single-crystal SMAs. Cu-based shape memory alloys (SMAs) generally perform poorly when they are polycrystalline, due to intergranular cracking associated with their high elastic anisotropy and transformation mismatch strains. However, the same brittle SMAs can exhibit excellent shape memory and superelasticity, as well as fatigue properties that approach those of single crystals, when they are produced in fine dimensions and with a specific grain microstructure: an oligocrystalline or "bamboo" grain structure where the grain boundaries lay almost perpendicular to the fiber axis, reducing relative grain boundary area [1,2]. These materials could be used in a number of novel applications, such as smart textiles, if they could be manufactured in large quantities via a continuous process.

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mentioning

confidence: 99%

Melt-cast microfibers of Cu-based shape memory alloy adopt a favorable texture for superelasticity

Tunçer

Schuh

2016

Scripta Materialia

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Shape Flow Casting and In-rotating-liquid-spinning Processes for the Continuous Production of Wires and of High-strength and Soft Magnetic Metallic Fibres

Cited by 1 publication

References 8 publications

Melt-cast microfibers of Cu-based shape memory alloy adopt a favorable texture for superelasticity

Melt-cast microfibers of Cu-based shape memory alloy adopt a favorable texture for superelasticity

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