I had been searching for a great lecture series on HEAs and this is such an awesome and informative lecture! Thank you for uploading :)
@bhadeshia12316 күн бұрын
Really glad you like the talk. Thank you.
@edwardroduit6732Ай бұрын
Magnifique soirée
@bhadeshia12326 күн бұрын
glad you like it..
@VaradNikam-w8zАй бұрын
In the last section of Calcium addition, what should be the criteria of Calcium wire addition? Is Calcium by Aluminum ratio by weight or by atomic fraction in the diagram at 1:07:37?
@bhadeshia123Ай бұрын
Lu DZ. Kinetics, mechanisms and modelling of calcium treatment of steel (Doctoral dissertation).
@VaradNikam-w8zАй бұрын
@@bhadeshia123 thank you sir.
@bill4639Ай бұрын
Great lecture! I would love to hear about the ultrasonic melting of steel.
@ethoslogospathosАй бұрын
And how the rf react to different colors (waves).
@bhadeshia123Ай бұрын
There may be something in the books Professor Eskin has written, but I cannot find anything to suggest that steel can be melted using ultrasonics, in any substantial manner.
@kknives_switzerlandАй бұрын
Oh hi Bill!
@bhadeshia123Ай бұрын
Here is an interesting citation of our paper, where it is appreciated that in general, crystals will tend to have factes that are low-index planes, except when they form in odd conditions such as on the moon: Zimmerman J, Rabkin E. Sculpturing metal nanoparticles by controlled massive deformation, Scripta Materialia. 252 (2024) 116248. Very small crystals were deformed between parallel platens to produce facets corresponding to planes with unusual crystallographic indices. The argument is that there are "unlimited possibilities for obtaining novel functional properties" at these artificial, high-energy facets.
@solconcordia4315Ай бұрын
The cat's whisker radio's crystal was often Galena(PbS). The p-n junction formed by this lead sulfide and the rather arbitrary and sharp metal wire nicknamed the cat's whisker was used for rectifying radio waves to make early radios possible. The p-n junction without the high-heat high-power problem of vacuum rectifying tube was the inspiration for the invention of the world-changing transistor by Bell Labs in lower Manhattan and New Jersey.
@bhadeshia123Ай бұрын
Thank you
@solconcordia4315Ай бұрын
Graphene allows holes to have a long mean free path. It's also one of the only two tiling patterns which has periodicity in multiple directions (3 for graphene but 2 for rectangular lattices). Having more directions for periodicity means that a scattered electron may have more chance to get back onto a periodic track.
@bhadeshia123Ай бұрын
Thank you
@solconcordia4315Ай бұрын
The edge of stanene may have de facto been p-type doped by its being at the end of the planar stanene with no atoms on one side to bond with it.
@bhadeshia123Ай бұрын
Sorry, not an expert on this.
@solconcordia4315Ай бұрын
Silicon normally forms four bonds in a diamond-like lattice. The silicon atoms at the surface of a highly purified bulk silicon sample cannot form bonds with the *MISSING* silicon atoms on the external side of the surface. These locations without the necessary electrons from the missing silicon atoms for completing the covalent bonds are "holes" denoting an area of positive charges (hence p-type, p standing for positive). Now gray tin has the same diamond lattice structure as silicon does so its surface is also rich in holes due to the incomplete bonds (a covalent bond needs two electrons but on a surface, only one side has silicon donating an electron to that covalent bond). Few-layer stanene is like such a diamond lattice squashed to near flatness like that of hexagonal graphene. The sides of these hexagons in few-layer stanene can form a polymeric tin backbone for conduction just like the polymeric carbon backbone for conduction in organic superconductors. The key is the conduction backbone and high density of holes on it so that the holes can *INTERACT STRONGLY* with each other to provide superconductivity. Since the white tin to gray tin transition temperature is 13.2C, it's plausible that tin is a near-STP superconductor.
@solconcordia4315Ай бұрын
@bhadeshia123 Around 13.2C, the two phases of tin can transition into each other but they have very different lattice structures (diamond-like vs. graphite-like). This is *DISTORTION* , maybe the kind referred to in this video. Few-layer stanene isn't exactly flat so it has layers very close by distorting each other. I expect that the tin atoms at an edge or a surface which are more isolated from other tin atoms to be bound less tightly to the bulk so white tin is likely the preferred lattice of them. In the bulk, gray tin may dominate.
@midinerdАй бұрын
Hi - I'm a drummer looking for a way to exercise both directions of a given joint's rotation (wrists, ankles) without having to focus on just 1 motion at a time. First, of course, paddling in the water came to mind. Upon looking up 'newtonian fluids' it states water is also one of these (of course, considering people dying upon impact of jumping from certain heights). Do you think this line of logic is suitable for me to consider making my own newtonian fluids of given viscosities or - help me with terminologies here - to basically make a 'recipe' of the resistance? I don't plan on it being a long-term solution but of course am becoming quite curious and inventive to pass the time of the muscle and neurological-buiilding stages. Is there recipes for adjusting the resistance of these fluids?
@midinerdАй бұрын
perhaps just submerging them in sand may also work. not sure.
@bhadeshia123Ай бұрын
Sorry, but I honestly do not have confidence in suggesting the best solution for joints.
@midinerdАй бұрын
@@bhadeshia123 Oh it's no problem :) If I find something interesting (might take months) I'll loop back around and let you kow if you're curious. thanks
@solconcordia4315Ай бұрын
Piezoelectric crystals can apply pressure with very precise level of control. What I mean by "dunking the degeneracy" is to apply pressure or voltage difference to push the Fermi level to create differing density of state available for holes' occupancy.
@bhadeshia123Ай бұрын
Okay
@solconcordia4315Ай бұрын
In the chart of plotting conduction band, forbidden band, and valence bands' energy vs. atomic spacing. The order of the elements with increasing atomic ⚛️ spacing are C, Si, Ge, Sn, and Pb.. to a gas. The electronic property changed from insulator (diamond) to semiconductor (silicon) to a semiconductor with a small bandgap (germanium) to metal with phase transition tin disease (white and gray tin) to a metal (lead) and to a gas. Tin occupies the atomic ⚛️ spacing near the cusp of the forbidden band where the conduction band nearly touches and merges with the valence band as the atomic ⚛️ spacing increases. Graphene is located at the cusp. Silver is also near there. The bandgap values of silver have large variances between different people's results. There might be multiple nearly flat bands congregating near the Fermi level for silver. These flat bands are conducive to having superconductivity so squeezed or extremely cold silver (thereby reducing the atomic spacing) may also become a superconductor. All materials if squeezed hard enough probably become superconducting when electron clouds of adjacent atoms overlap with each other.
@solconcordia4315Ай бұрын
Neutron stars are probably superconductors. Jupiter's core probably has superconducting hydrogen. Earth may have an outer core with a superconducting layer lying just beneath the mantle so the interface between them when distorted changes the Earth's magnetic field. The Earth's core has a Moon-size monocrystalline (annealed over billions of years of slow cooling) ferroelectric magnet so the superconducting outer core layer has an induced electrical current.
@hitbabaji4052Ай бұрын
Excellent
@bhadeshia123Ай бұрын
Thank you.
@solconcordia4315Ай бұрын
In cat's whisker crystal radio's detector, what metal the cat's whisker is made of doesn't matter. It turns out that the surface atoms of the semiconductor the whisker touches are p-type due to their broken bonds letting holes be created. Tin crystal's edge may have similar broken-bond doping creating many more holes.
@bhadeshia123Ай бұрын
Thank you
@solconcordia4315Ай бұрын
If one sees the carbon polymeric backbone as a part of graphene, one can see that graphene offers more carbon polymeric backbones going in different directions. Graphene is thus an organic superconductor, too. Tin has the same hexagonal crystalline structure as graphene does and it's already a metal so tin is probably an inorganic metallo superconductor. The phase transition of tin disease in cold temperature to gray tin means that tin is teetering on the brink of being a metal and a covalent solid in which electrons are more localized. I thought that limed graphene has potential because a calcium ion has two outer valence electrons amenable to being tunneled to a nearby Wigner-Seitz cell. Oxygen ion similarly has two holes. Doping with europium can swing the ratio of electrons to holes. A europium ion can have multiple oxidation numbers and it's size can jump a lot between its different sizes so its interaction with the graphene can *change a lot* as electron density changes.
@bhadeshia123Ай бұрын
Thank you
@solconcordia4315Ай бұрын
Oops again ! It's Bill Little, not Arthur D. Little, right ? 😂
@bhadeshia123Ай бұрын
Okay
@solconcordia4315Ай бұрын
Oops ! I didn't get the name of the originator of this organic superconductors idea correctly. It's Arthur D. Little in 1964, not Philip W. Anderson. Stanene is reportedly a room-temperature ambient-pressure (near-STP) superconductor. I got this suggestion from 'NextBigFuture' website in a chat exchange area regarding superconductors. Stanene may be a topological superconductor on its broken edge because it probably has the same conducting backbone structure as the carbon backbone in these organic superconductors. We know that tin(stannum in Latin) suffers from the tin disease due to a near-STP phase transition into crumbly gray tin. There are also many stable isotopes of tin so there are probably a large selection of bandgaps available in tin. There's the idea of "lifting the degeneracy" but maybe "dunking the degeneracy" to create a lot more holes can work.
@bhadeshia123Ай бұрын
Thank you
@anibaldiluch98972 ай бұрын
Sir I have just ordered it from Amazon but it is out of stock!😢 I am in the waiting list...
@bhadeshia1232 ай бұрын
Sorry to hear that. You can order directly from the publisher at shop.elsevier.com/books/steels/bhadeshia/978-0-443-18491-8
@patatjuih2 ай бұрын
it's a muntjac
@bhadeshia1232 ай бұрын
Indeed it is.
@LucaPetri862 ай бұрын
Cobble = Terrible high temperature spaghetti 😂
@bhadeshia1232 ай бұрын
No, "cobble" means "a small round stone used to cover road surfaces"
@luc42422 ай бұрын
who else cramming rn
@bhadeshia1232 ай бұрын
What does "cramming m" mean?
@luc42422 ай бұрын
Cramming means last minute study and trying to consume as much information as possible in a short period of time. I was cramming for my metallurgical systems exam.
@romanh17292 ай бұрын
Such a beautiful creature! Greetings from Tenerife.
@bhadeshia1232 ай бұрын
Thank you, and clearly enjoying itself.
@Cheese-k4r2 ай бұрын
4th dimension lore
@bhadeshia1232 ай бұрын
yes, wisdom.
@MetalurgiaMéxico2 ай бұрын
You are lucky. I could see dears in Akron, Ohio, USA. The dears were free in nature. However, the automoviles could drive over them because the forest preserve is sounrounded by the Akron city.
@bhadeshia1232 ай бұрын
I imagine the deer in Ohio are much bigger. The Muntjac deer is about the size of dog.
@muka20242 ай бұрын
Great talk! Has this work been published in a paper?
@@bhadeshia123 Have you done any hydrogen embrittlment tests on this material?
@thanos8343 ай бұрын
2 black dots aren’t even connected to anything on the structure…
@bhadeshia1232 ай бұрын
Bear in mind that this is ONE unit cell, which is then repeated periodically, so bonds are there but into the adjacent cells
@kbsfilters67613 ай бұрын
Hello may we please have the reference of industries who are expert in manufacturing this type of cooper wheels?
@bhadeshia1232 ай бұрын
Afraid I do not have that information
@josecosta86203 ай бұрын
Parece o (CASTORO 8 ) da SAIPEM
@bhadeshia1233 ай бұрын
?
@josealbertobejaranoulloa22803 ай бұрын
What a special moment, Harry! Blessings.
@bhadeshia1233 ай бұрын
Thank you, Jose, it really is nice to see wild-life in Comberton, which is only six miles away from the city of Cambridge.
@itsrachelfish3 ай бұрын
The awkward side eye at the end was my favorite part 🤣 Great presentation, I learned a lot 😊
@bhadeshia1233 ай бұрын
Good you learned.
@tommieeriksson2713 ай бұрын
What is the name of this new alloy?
@bhadeshia1233 ай бұрын
www.phase-trans.msm.cam.ac.uk/2019/abrasion.html
@hikguru3 ай бұрын
Hello Dr. Bhadeshia. At the 19:29 mark a pole is marked as one, one bar, one bar on the top left quadrant. Should it not be one bar, one bar, one instead? Thx.
@bhadeshia1233 ай бұрын
Thank you, you are quite right, it should read bar 1, bar 1, 1, as shown on page 40 of this book that you can download free-of-charge. www.phase-trans.msm.cam.ac.uk/2020/Crystallography_book.pdf
@paulmeersa71623 ай бұрын
Loving this, then I discovered this! kzbin.info7KX5CZ_Og9M?si=fU74EmIwCG5JlLM5
@pedrodeoliveiracamargo24133 ай бұрын
Great Lecture, more tks from Brazil
@bhadeshia1233 ай бұрын
You are welcome! There is a free book you can download from www.phase-trans.msm.cam.ac.uk/teaching.html
@robertszallavarysullivan95703 ай бұрын
The T bottle railroad car hauls molten iron from the blast furnaces to the BOF plant, where it is mixed with scrap steel and Flux elements to make steel.
@bhadeshia1233 ай бұрын
Thank you.
@benhiggins8113 ай бұрын
just explained something complicated in 10 secs
@bhadeshia1233 ай бұрын
Glad you enjoyed it.
@paulmeersa71623 ай бұрын
Thanks for this Harry, it is really interesting to hear from these guys.
@bhadeshia1233 ай бұрын
Glad you enjoyed it
@starcasmlove3 ай бұрын
They feast.
@bhadeshia1233 ай бұрын
??
@darshankava54803 ай бұрын
How to weld titanium in joint surface in clad plate?
@bhadeshia1233 ай бұрын
Bellini L, Giumelli R. Welding of titanium clad components. Welding International. 1987 Jan 1;1(2):155-64.
@KCCardCo4 ай бұрын
A rich mans gramophone.
@bhadeshia1233 ай бұрын
Lots of fun
@jillanneyoussef52574 ай бұрын
Thanks boss
@bhadeshia1233 ай бұрын
Very welcome
@kaliprasad19254 ай бұрын
Excellent lectures by Prof. Bruno De Coomean
@bhadeshia1234 ай бұрын
Agree wholeheartedly.
@mountainbiker93304 ай бұрын
💯
@bhadeshia1234 ай бұрын
?
@bluebeard24 ай бұрын
Quality video. I know nothing about the metallurgical sciences. Like others, I came here to hear tin cry, but instead, stayed to the end of the video. Even after hearing tin cry in the middle.
@bhadeshia1234 ай бұрын
Well done.
@wickedslug8834 ай бұрын
@bhadeshia1234 ай бұрын
?
@user-ys9wy2bx1p4 ай бұрын
Very professional
@bhadeshia1234 ай бұрын
Indeed, thank you.
@powtec-metallurgy4 ай бұрын
Thank you for inviting me to present our work at Sintex🙏. If you want to learn more about my activities you can follow me on my video podcast On metallurgy On the link below. BR Peter youtube.com/@powtec-metallurgy?si=Y1re2eHLn3aTvAdP
@bhadeshia1233 ай бұрын
Thank you.
@narendradhokey3924 ай бұрын
Nice explanation, Thanks
@bhadeshia1234 ай бұрын
Glad you liked it
@shqueeblesmckloofin73514 ай бұрын
Everyone should read The Forge and the Crucible by Leade