| About Furukawa's Shape Memory and Super-elastic alloys (Furukawa NT Alloys)
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| 1. Property of Furukawa's NT Alloys |
| When ordinary metallic materials have an excessive stress toad applied, beyond their elastic regions, they are not able to fully restore their original shapes. After the excessive stress load is removed, a permanent deformation remains. |
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When Furukawa's NT shape memory alloys have an excessive stress load applied, beyond its elastic region, at a temperature less than the transformation (Af) temperature, it undergoes a plastic-like deformation. When heat, higher than the transformation temperature is applied, the deformation disappears and the original shape is restored.
Furukawa's Super-elastic NT alloy can accept an excessive stress load up to ten times the alloy's elastic stress region, at a temperature higher than the transformation temperature.
When the excessive stress load is removed, the deformation disappears and the alloy restores its original shape. |
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| 2. Integrated Production System |
| Furukawa offers a complete manufacturing solution in an integrated production system ranging from the melting operation through forming and machining fabricated parts. Product quality is highly controlled with strict engineering and manufacturing parameters. |
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| Hot Processing Line |
Eddy Current Detector |
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| Continuous Annealing Furnace |
| Wide Variety of NT Alloys |
Furukawa offers a wide variety of NT alloy formulations to meet your shape memory characteristics, super-elastic characteristics and customer specific requirements. A wide range of transformation temperatures is also available.
Please contact us with your specific requirements. We can offer further information and guidance to engineer your custom device design requirements. |
| Effect |
Symbol |
Alloy types |
Range of transformation temperatures
(°C) |
Restorable deformation
(%) |
Temperature hysteresis
(°C) |
Durability |
Application example |
| Shape memory effect |
NT-M
NT-LS |
Ni-Ti
Ni-Ti-Fe |
0 - 70 |
1 |
2 - 3 |
>1,000,000 |
Sensor actuator designed for a long service life |
| NT-H |
Ni-Ti-Cu |
50 - 80 |
5 - 6 |
10 - 15 |
10,000 - 50,000 |
Sensor actuator designed for a large stroke |
| NT-M |
Ni-Ti |
-10 - 100 |
6 - 8 |
20 - 40 |
<100 |
Connector Joint |
| Effect |
Symbol |
Alloy types |
Range of transformation temperatures
(°C) |
Super-elastic stress
(MPa)
[kgf/mm2] |
Stress hysteresis
(MPa)
[kgf/mm2] |
Feature Application |
Application example |
| Super-elastic effect |
NT-E
NT-L |
Ni-Ti
Ni-Ti-Fe |
-20 - 50 |
294 - 588
[30 - 60] |
245 - 428
[25 - 45] |
Long service life
Good machinability |
Various spring devices
Antenna core wire
Brassiere wire
Frame of glasses
Orthodontic wires
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NT-N
NT-RA |
Ni-Ti
Ni-Ti-Cr |
490 - 882
[50 - 90] |
High super-elastic stress |
| NT-HR |
Ni-Ti-Cu-Cr |
294 - 588
[30-60] |
98 - 294
[10 - 30] |
Low stress hysteresis |
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