I have not looked into the structure of NiTi but have a hard time understanding how something that is so maleable can have such a high surface hardness.
NiTi is not malleable, its a memory shape alloy, which if my understanding is correct then, the alloy is heated to a specific temperature and shaped into the shape it is to remain.
Below this temperature the Metal will allow for some deformation returning to its shape when the load is removed. However if you re heat it back to above its initial forming temperature then it it return to its original state. It also gets more brittle the colder it gets and less inclined to want to flex
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Malleable metals are Copper, lead , gold, etc which can be easily formed into shapes, NiTi is quite the opposite.
As for its surface hardness, no one anywhere seems to provide that information
Funnily enough. I believe from what i have read if the surface is treated with Nitrogen then It forms TiN which is a very hard coating, still i know from experience on stainless steel snakes with TiN coating it wears off. It should be measured in Vickers.
Of all the rings, Titanium Nitrate lined have the greatest hardness, only people that i ever new of to use these on production rods, were David Norwich and Orvis (right upto to the T-3) but that was only for stripping guides.
Do you know what Snakes Orvis are using on the helios? and is the tip ring a short tube with a round ring as opposed to a hayfork?
I have a couple of full sets of single snakes, the standard H & H ones in black and Chrome, they are quite a bit heavier than recoils, but i have built a TCR with these before and it was very nice.
I take it the ones you want to swap are not the grooved ones still on the rod
Sandy