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UPD: Friends, the most interesting thing is in the second part of the video. According to statistics, I see that everyone watches the part about martensite for the first three minutes and leaves before the part about shape memory begins.
There are a huge number of videos on the Internet where craftsmen take some kind of magic paper clip, straighten it, and then heat it with a lighter and the paper clip takes on its old shape. This, my friends, is a manifestation of the so-called shape memory. And I haven’t come across an intelligible explanation of the process.
At one time the trend was very fashionable. Mostly when it came to shape memory, they usually talked about some kind of pillows and sleep masks. In practice, cheap copies used ordinary soft foam. But the phenomenon of shape memory is much more interesting to consider in relation to alloys and using the example of a paper clip. There is a whole direction in materials science - shape memory alloys. If you make a spoon from such an alloy, then bend it, and then heat it with a lighter or in hot water, it will return to its original configuration. Shape memory alloys have become widespread and can be used very widely in practice.
But what kind of special street magic lies behind this phenomenon and what physical process occurs inside the shape memory material? In the new video, we will break down the entire physics of the process and understand such an interesting physical process in an intelligible form. Let's find out why they often talk about titanium and nickel alloys, and what nitinol is. How is hardening related to this and what is martensite? Moreover, let us select an interesting simple analogy for the behavior of the structure.
And you know what's interesting here? In view of my other physical research, I remember a phrase from the Matrix: There is no spoon, Neo :)...
Timeline:
01:17 - Shape memory - a popular effect
01:47 - A few words about polymer materials “with shape memory”
02:57 - At the same time, let's see the fox hole
03:20 - Approximate description of alloy hardening
04:50 - What is martensite?
05:50 - Titanium and nickel. The most famous shape memory alloy
06:47 - Special martensite in nitinol
07:40 - Specific structure of shape memory alloys
10:15 - The most important thing is to understand the structure of the atom
Enjoy watching everyone!
24 фев 2024
