Shape memory alloys (SMAs) are smart materials that can change shape in response to temperature changes. SMAs were first observed in 1932 in a gold-cadmium alloy and later in brass. The most common SMA is a titanium-nickel alloy. SMAs exist in two forms: one-way SMAs remember one shape, while two-way SMAs remember two shapes, one below and one above the memory temperature. SMAs have applications in medical devices like stents and orthodontic braces, and aerospace uses like aircraft wing flaps. More applications are being developed as research on SMAs continues.

1. SHAPE MEMORY ALLOYS
-by Bhanu uday

2. Introduction To SMAs
 Shape memory alloys are one of the most well known
types of smart materials and they have found extensive
uses in the 70 years since their discovery.
 A shape memory transformation was first observed in 1932
in an alloy of gold and cadmium and later in brass in 1938.
 In 1962 an equiatomic alloy of titanium and nickel was
found has become the most common SMA.

3. Working Of SMAs
 The SMA describes the process of a material changing shape or
remembering a particular shape at a specific temperature.
 There are two types of SMAs
1) One way SMAs
2) Two way SMAs
 In one way SMAs materials remember one shape to a particular
temperature.
 Some alloys show a two way effect in which they remembers two
shapes, one bell=ow and one above the memory temperature.

4. Here is video to show you how fast SMAs

5. Medical Applications SMAs
 Since nitinol is biocompatible it can be use in side body
without any adverse effect.
 They are used to open blocked veins.
 Broken bones can be fixed by using SMAs.
 In dentistry for orthodontic braces which straiten teeth.
 Surgical tools particularly those used in key hole surgery
may also be made from SMAs.

6. Robotic Hand Orthodontic Braces

7. Aerospace and Manufacturing
Applications of SMAs
 A more high tech application is the use of SMA wire to
control the flaps on the trailing edge of aircraft wings.
 In SMA wires which are résistance heated by passing a
current through them they get the shape we required.
 Such a system would be considerably simpler to replace
hydraulics which are expensive and requires maintenance
and it would decrease weight of Aircraft.
 SMA tubes can be used as coupling for connecting two
tubes.

8. Summary of SMAs
 These are just a few examples for SMAs and more research
is going on these materials and more applications will be
developed in future.

9. Thank you one and all