Introduction to Shape Memory Alloys Technical Seminar Topic:
An alloy is a homogeneous mixture of two or more metals. Shape memory alloys are metals that never lose their original shape.
The standard feature of shape memory alloy is martensitic phase transformation. Martensitic transformation follows deformation of crystal lattice and diffusion less process. Deformation is alteration of shape by pressure and diffusion is transferring the atoms or molecules by their random motion from one part of the molecules to anther.
Properties:
It has the two unique properties those are: i) shape memory effect ii) pseudo-elasticity
In shape memory effect the transformation is done without stress, at particular temperature say M0f until the temperature is lowered to M0f then reverses transformation starts at A0s and at the temperature of A0f the metal will be formed. Pseudo-elasticity is done under a fixed temperature; transformation is based on loading and unloading. These types of alloys are just like rubbers they contain the elasticity.
A bit of shape memory alloys applications:
Shape memory alloys technique is used in the preparation of bone plates and stent. these are used in the applications of dental and orthodontic.
Advantages and Disadvantages:
We have several advantages and disadvantages of shaped memory alloys. Bio-compatibility, divers’ field of application and good mechanical properties are the advantages. Disadvantages are, these are very expensive and poor fatigue properties.
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