Shape memory alloys are materials that can change shape when heated or cooled by transforming between martensite and austenite phases. They undergo the shape memory effect where heating causes them to change from the martensite structure to the austenite structure, and then cooling causes them to return to the martensite structure and original shape. Shape memory alloys can also exhibit superelasticity at a constant temperature through reversible deformation without a phase change. They are classified as either one-way shape memory alloys that retain the same phase during heating and cooling or two-way shape memory alloys that undergo spontaneous and reversible deformation through the phase change with only temperature changes.

1. By,
Satha Siva Pandian.M
Stanley Golden Paul.C

2. Shape memory alloys are alloys that change their shape
from its original shape to a new shape and while heating /
cooling it will return to its original shape

5. PHASES(STRUCTURES) OF SMA
• Martensite
• Austenite

8. PROCESSING OFSMA
• Shape memory Effect:
It is very clear that at lower temperature the SMA will
be in Martensite structure and when it is heated then it will
change its shape to Austenite structure and while cooling it
will again return to its Martensite form .This effect is called
SHAPE MEMORY EFFECT

11. SUPER-ELASTICITY
• The SMA which have change in its shape at a constant
temperature are called Super-elastic SMAs and that
effect is known as Super-elasticity.

12. TYPES OF SMA
• ONEWAY SMA
• TWOWAY SMA

13. One way SMA
• Though there is some change in its temperature , the
SMA retains in the same phase , and this type of material
is called ONEWAY SMA

14. ONEWAY SMA

15. Two way SMA
• The type of materials which produces spontaneous and
reversible deformation just upon heating and cooling
even without load are calledTWOWAY SMA

16. TWO WAY SMA

17. SMA Tubes In Automobiles

18. SMA Engine

19. SMA Wires

20. SMA in Air-craft

23. Thank You!