hello everyone today I'll will tell you
about one unusual object the paper clip
this clip is made from a very unusual
material nitinol nitinol is an alley of
nickel and titanium in proportions of
45% titanium and 55% nickel this Alo has
a unique property that was discovered in
1961 by American
scientists the property of this alloy is
called shape memory so to demonstrate
this property let's conduct an
experiment take a clip of nitinol and
deform it besides the clip I as well
have a spring made of nanl which I also
deform into a random shape the
activation temperature of nanl is about
40° C I have turn on the burner on the
stove and put the deformed Nal clip on
its surface over time while heated the
clip begins to return to its original
shape the same thing happens with the
spring this happens because when the
temperature changes the crystal lce
configuration of nanl changes from one
phase to another also nanel is 10 times
more elastic than other
metals
[Music]
while nanel restores the shape it can
also do some
work let's see what kind of work a small
spring of nanl can make I have attached
the spring to a tripod and H a porcelain
basket onto it which wakes 180 g next we
stretch the spring for the spring to be
tight it again I'll heat it with a
lighter let's
proceed as you can see the Sprint has
live the basket quite easily now we'll
complicate the task I'm adding metal
beers into the basket and the total
weight now becomes
278 G testing the spring as you can see
the spring can easily handle that task
adding more weight I now put the stone
and a piece of perod into the basket
total weight is now
414
G and as you can see nothing can stop
the power of our spring in order to
ensure how big is the power that Nal
creates when restoring the fo i h a
YouTube Silver button on a spring which
wakes about 1
kg try again with heat in the ntino and
what we see is even this huge weight can
be risen by the spring very easily
however you could now probably ask if
it's such an amazing alloy why don't we
use it in our everyday life the main
dback of Nal is its high price and the
complexity of manufacturing and Welding
in the 17s experiments were carried in
the United States on engine models based
on nitol and its properties
however it hasn't gone further than the
Prototype stage the statement of us
leadership of disadvantage of the
project became the reasoning to reject
this idea today nanl is mainly used in
medicine for bone bonding who knows
maybe in the future when the oil runs
out Humanity will revert to the Nal
engines
[Music]