>It's two times stronger than steel, three times stronger than aluminum, and twice as strong as the same alloy made in a conventional way. Ugh. The most basic bitch metallurgy discussion possible. Oh! It’s stronger than aluminum?! So is bronze, we’ve hard that for awhile! Is the new material lighter than aluminum while being stronger? Is it corrosion resistant? Is it machinable? Can you weld it? Does it oxidize? Does…
I want to live in a world where these (important!) points are surfaced without their presenter sounding like they were personally insulted, and are frustrated to have to bring them up.
As hard as ever. US and USSR and EU has this tech, China, India and others still don't. When USSR tech was sold left and right in 1990s, China could not replicate it, although they surely got the documentation back then. Even now they can't build a reliable gas generator from 70s and are stuck at 1960s level with R-25 MiG-21-style engine replicas. They still try and fail to build AL-31 analogs (1978, Su-27 engine).
This is an American-Pro forum, you will only get dislikes promoting the idea that USSR had any technology or morality matching or exceeding Western superiority ;)
> Tests showed the new alloy achieved a compressive yield strength of more than two gigapascals while retaining its ductility, meaning it bends without breaking. This is sleight-of-hand. For metals, the operative properties are usually ultimate tensile strength and tensile yield strength . Compressive strength is typically a non-factor for most engineering alloys; only concrete is judged by its compressive strength,…
> High compressive strengths are not very useful.
I mean, it depends on the use case right? Modern tall buildings/skyscrapers with metal framing use metal pillars where high compressive strength is very useful.
Hm I just read an article here recently that was saying that Americans had an edge in jet turbine blades production over china because Americans figured out how to make single crystal jet turbines using this same method. I wonder what the difference is.
This isn't exclusive to the Americans, do Rolls Royce in the UK not use similar methods?
> Tests showed the new alloy achieved a compressive yield strength of more than two gigapascals while retaining its ductility, meaning it bends without breaking. This is sleight-of-hand. For metals, the operative properties are usually ultimate tensile strength and tensile yield strength . Compressive strength is typically a non-factor for most engineering alloys; only concrete is judged by its compressive strength,…
> High compressive strengths are not very useful. I mean, it depends on the use case right? Modern tall buildings/skyscrapers with metal framing use metal pillars where high compressive strength is very useful.
Absolutely nobody is using an expensive novel alloy for 2GPa compressive strength. A 2GPa tensile strength, depending on various other factors such as corrosion resistance and thermal properties, could however be very interesting. (The strongest bulk steel alloys generally peak at ~3.6GPa tensile, which is approximately their theoretical maximum, but there are a lot of applications where steel simply can't be used. Nickel superalloys are typically 0.9 to 1.1GPa UTS.)
This is really cool metallurgy. They start with an alloy and deform it and because of elemental size mismatch they can cause the alloy to self assemble into nanoscale crystals with three different structures The paper: https://www.science.org/doi/10.1126/science.aec4995 As an aside, “super alloy” is not the best wording choice on the part of the author of this sciencealert article, superalloys are an established allo…
This is basic metallurgy that every metal forger and alloy designer is already aware of.
> High compressive strengths are not very useful. I mean, it depends on the use case right? Modern tall buildings/skyscrapers with metal framing use metal pillars where high compressive strength is very useful.
Absolutely nobody is using an expensive novel alloy for 2GPa compressive strength. A 2GPa tensile strength, depending on various other factors such as corrosion resistance and thermal properties, could however be very interesting. (The strongest bulk steel alloys generally peak at ~3.6GPa tensile, which is approximately their theoretical maximum, but there are a lot of applications where steel simply can't be used. N…
That's true, but it's still factor and if price comes down having that much compressive strength at your disposal could be an interesting choice for supertall skyscrapers.
An edge that dates back to the late 60's/early 70's? How soft is that edge by now?
As hard as ever. US and USSR and EU has this tech, China, India and others still don't. When USSR tech was sold left and right in 1990s, China could not replicate it, although they surely got the documentation back then. Even now they can't build a reliable gas generator from 70s and are stuck at 1960s level with R-25 MiG-21-style engine replicas. They still try and fail to build AL-31 analogs (1978, Su-27 engine).
Hm I just read an article here recently that was saying that Americans had an edge in jet turbine blades production over china because Americans figured out how to make single crystal jet turbines using this same method. I wonder what the difference is.
This isn't exclusive to the Americans, do Rolls Royce in the UK not use similar methods?
As hard as ever. US and USSR and EU has this tech, China, India and others still don't. When USSR tech was sold left and right in 1990s, China could not replicate it, although they surely got the documentation back then. Even now they can't build a reliable gas generator from 70s and are stuck at 1960s level with R-25 MiG-21-style engine replicas. They still try and fail to build AL-31 analogs (1978, Su-27 engine).
This is an American-Pro forum, you will only get dislikes promoting the idea that USSR had any technology or morality matching or exceeding Western superiority ;)
> morality matching or exceeding Western
Not sure if troll or misguided, but you know there are people still alive today that can talk about that moral superiority from experience, right? Just ask them, read their stories, etc. If this is how we're talking about that part of the world in that time-frame, I shudder to think how it'll be talked about when there aren't any more people from that period around. We kinda can see that with the neo- movements...