Shape memory-alloys
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Shape memory-alloys

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  • The two underlined alloys are by far the most common. Cu-Al-Ni for being cost effective, and Ni-Ti for working better.

Shape memory-alloys Presentation Transcript

  • 1.  Buehler’s discovery of an NiTi alloy (Nitinol) in1962, formed the basis for commercial use.Before then shape memory alloys had beenobserved but where not affective enough forpractical use. SMA’s have seen commercial use since the late1980’s when they where first used for couplingon oil pipes.
  • 2.  One way SMA’s are the most common type and can be deformed when cool, butupon heating, they return to their trained shape. Two way SMA’s can be trained to have a cool shape as well as a hot one. Different types include Ag-Cd 44/49 at.% Cd Au-Cd 46.5/50 at.% Cd Cu-Al-Ni 14/14.5 wt.% Al and 3/4.5 wt.% Ni Cu-Sn approx. 15 at.% Sn Cu-Zn 38.5/41.5 wt.% Zn Cu-Zn-X (X = Si, Al, Sn) Fe-Pt approx. 25 at.% Pt Mn-Cu 5/35 at.% Cu Fe-Mn-Si Pt alloys Co-Ni-Al Co-Ni-Ga Ni-Fe-Ga Ti-Pd in various concentrations Ni-Ti (~55% Ni
  • 3.  The most common commercial applicationinvolves the pseudo-elastic property during it’shigh temperature state. This includes eye-glasses, cell phone antennas,and so on, which are experiencing their hightemperature state at room temperature.
  • 4.  In the future, if significant steps can taken in costreduction, SMA’s will be used for almost every metalobject. Mail boxes could pop back into shape on a sunnyday. That slinky you had as a child would have lastedlonger then thirty minutes. Imagine getting into a car wreck, then only needing tohold a torch to your vehicle to repair the damage. There are endless new uses for Biomedical applications,such as surgical equipment and mechanical devices. There could also be morphing airplanes and submarinesthat could increase efficiency at different speeds.
  • 5.  In the future, if significant steps can taken in costreduction, SMA’s will be used for almost every metalobject. Mail boxes could pop back into shape on a sunnyday. That slinky you had as a child would have lastedlonger then thirty minutes. Imagine getting into a car wreck, then only needing tohold a torch to your vehicle to repair the damage. There are endless new uses for Biomedical applications,such as surgical equipment and mechanical devices. There could also be morphing airplanes and submarinesthat could increase efficiency at different speeds.