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Peter Davies
United States
เข้าร่วมเมื่อ 3 พ.ค. 2021
Phase Transformations and TTT Diagrams in Materials Science (Part 3: Fe-C Steels)
The transformation of materials into different phases is critical in mediating their properties, application and engineering performance. How do phase transformations take place? How long do they take? How can the transformation be mapped as a function of temperature and time and controlled to produce a desired microstructure?
Using examples of liquid solidification, glass formation, and transformations in Fe-C steels, in this three part tutorial you will learn about the mechanisms of phase transformations, how the nucleation and growth of a new phase depends on the degree of undercooling, and how to generate and read a so-called TTT diagram where the path of the Transformation is quantified as a function of Temperature and Time. The tutorials are presented at a level appropriate for a sophomore undergraduate introductory course in Materials Science and Engineering or related major, with some prior exposure to introductory thermodynamics.
This last video extends the principles used to quantify and understand the crystallization of liquids, to transformations where all the phases involved are solid. You will learn how TTT diagrams for the Iron-Carbon (steel) system are used to tailor the microstructure and properties of so-called pearlite steels and how that transformation can be bypassed to form martensite, the hardest form of carbon steel.
Using examples of liquid solidification, glass formation, and transformations in Fe-C steels, in this three part tutorial you will learn about the mechanisms of phase transformations, how the nucleation and growth of a new phase depends on the degree of undercooling, and how to generate and read a so-called TTT diagram where the path of the Transformation is quantified as a function of Temperature and Time. The tutorials are presented at a level appropriate for a sophomore undergraduate introductory course in Materials Science and Engineering or related major, with some prior exposure to introductory thermodynamics.
This last video extends the principles used to quantify and understand the crystallization of liquids, to transformations where all the phases involved are solid. You will learn how TTT diagrams for the Iron-Carbon (steel) system are used to tailor the microstructure and properties of so-called pearlite steels and how that transformation can be bypassed to form martensite, the hardest form of carbon steel.
มุมมอง: 122
วีดีโอ
Phase Transformations and TTT Diagrams in Materials Science (Part 2: S-Curves and TTT Diagrams)
มุมมอง 67วันที่ผ่านมา
The transformation of materials into different phases is critical in mediating their properties, application and engineering performance. How do phase transformations take place? How long do they take? How can the transformation be mapped as a function of temperature and time and controlled to produce a desired microstructure? Using examples of liquid solidification, glass formation, and transf...
Phase Transformations and TTT Diagrams in Materials Science (Part 1: Nucleation & Growth; Rates)
มุมมอง 99วันที่ผ่านมา
The transformation of materials into different phases is critical in mediating their properties, application and engineering performance. How do phase transformations take place? How long do they take? How can the transformation be mapped as a function of temperature and time and controlled to produce a desired microstructure? Using examples of liquid solidification, glass formation, and transf...
Crystal Chemistry of Ionic Materials (Part 2: Polyhedral Models)
มุมมอง 4942 ปีที่แล้ว
This 3-part series of tutorials on the crystal chemistry of ionic materials provide an overview of the principles of ionic crystal structures and their representation using polyhedral models. They are presented at a level appropriate for an introductory undergraduate course in materials science and assumes some prior exposure to the structures of close packed metals. This second part explores m...
Crystal Chemistry of Ionic Materials (Part 1: Cation Sites in Close Packed Structures)
มุมมอง 5672 ปีที่แล้ว
This 3-part series of tutorials on the crystal chemistry of ionic materials provide an overview of the principles of ionic crystal structures and their representation using polyhedral models. They are presented at a level appropriate for an introductory undergraduate course in materials science and assume some prior exposure to the structures of close packed metals. This first part provides a s...
Crystal Chemistry of Ionic Materials (Part 3: Perovskite: Cation-Anion Close Packing)
มุมมอง 5482 ปีที่แล้ว
This 3-part series of tutorials on the crystal chemistry of ionic materials provide an overview of the principles of ionic crystal structures and their representation using polyhedral models. They are presented at a level appropriate for an introductory undergraduate course in materials science and assumes some prior exposure to the structures of close packed metals. In the final video we explo...
Bonding: Atomic Orbital Overlap and Molecular Orbitals (Part 2: Factors Affecting Orbital Overlap)
มุมมอง 6512 ปีที่แล้ว
Bonds are formed in materials through the overlap of atomic orbitals. In these videos you will learn how the overlap produces different types of molecular orbitals, what factors affect the degree and type of overlap, and how the MO model can be used to understand bonds in ionic and covalent materials. This second video describes how symmetry and shape, bond distance, and differences in electron...
Bonding: Atomic Orbital Overlap and Molecular Orbitals (Part 1: Overview of MO Formation)
มุมมอง 1.4K2 ปีที่แล้ว
Bonds are formed in materials through the overlap of atomic orbitals. In these videos you will learn how the overlap produces different types of molecular orbitals, what factors affect the degree and type of overlap, and how the MO model can be used to understand bonds in ionic and covalent materials. This first video gives a short overview of the formation of bonding and antibonding molecular ...
Tutorials in Materials Science: Bond Energy and Crystal Energy
มุมมอง 1K2 ปีที่แล้ว
The properties of materials are intimately related to their stability in the solid state. Comparisons of the strength of the bonding in different solids depends on a number of factors, the strength of an individual bond, the type of bonding, the crystal structure, and the chemical stoichiometry. In this video you will learn about the energies of bonds in solids and how the strength of one bond ...
Electronic Structure of the Atom: (Part 4: Electron Energy States, Periodic Trends)
มุมมอง 3132 ปีที่แล้ว
To understand and predict the bonding in materials it is important to have a good grasp of the electronic structure of the atom. These tutorials explain the connection between electronic wavefunctions and atomic orbitals. They are presented at a level suited to a sophomore student taking an introductory course in materials science and engineering and assume some prior exposure to the basics of ...
Electronic Structure of the Atom: (Part 3: Angular Nodes, Boundary Surface Diagrams)
มุมมอง 6452 ปีที่แล้ว
To understand and predict the bonding in materials it is important to have a good grasp of the electronic structure of the atom. These tutorials explain the connection between electronic wavefunctions and atomic orbitals. They are presented at a level suited to a sophomore student taking an introductory course in materials science and engineering and assume some prior exposure to the basics of ...
Electronic Structure of the Atom: (Part 2: Visualizing Orbitals; Radial Nodes)
มุมมอง 5942 ปีที่แล้ว
To understand and predict the bonding in materials it is important to have a good grasp of the electronic structure of the atom. These tutorials explain the connection between electronic wavefunctions and atomic orbitals. They are presented at a level suited to a sophomore student taking an introductory course in materials science and engineering and assume some prior exposure to the basics of ...
Electronic Structure of the Atom: (Part 1: Quantum Numbers, Wavefunctions, Orbitals)
มุมมอง 5682 ปีที่แล้ว
To understand and predict the bonding in materials it is important to have a good grasp of the electronic structure of the atom. These tutorials explain the connection between electronic wavefunctions and atomic orbitals. They are presented at a level suited to a sophomore student taking an introductory course in materials science and engineering and assume some prior exposure to the basics of ...
Fe-C Steels: (Part 2: The Formation of Martensite, Shape Memory Alloys)
มุมมอง 8123 ปีที่แล้ว
Martensite is the hardest form of steel and is stabilized when the rapid quenching of a Fe-C steel to low temperature traps the interstitial carbon atoms in the high temperature face centered cubic (FCC) phase of Iron. The trapped carbon atoms induce a distortion of the FCC phase to a distorted tetragonal structure via a “diffusionless” shearing mechanism (a martensitic transformation). The tra...
Fe-C Steels: (Part 1: Why is Carbon Unstable in the BCC Form of Iron?)
มุมมอง 9023 ปีที่แล้ว
The mechanical strengths of Fe-C steels are intimately related to their microstructures which in turn are controlled through the details of their processing and heat treatment. The key factor responsible for the diversity of their mechanical response is the phase transformation of Iron from a close packed face centered cubic (FCC) structure to a less densely packed body centered cubic (BCC) for...
Grain Boundaries in Materials (Low Angle Boundaries, Coincidence Site Lattices)
มุมมอง 10K3 ปีที่แล้ว
Grain Boundaries in Materials (Low Angle Boundaries, Coincidence Site Lattices)
Reading Ternary Phase Diagrams in Materials Science (Part 5: Complex Systems, MgO-Al2O3-SiO2)
มุมมอง 4.7K3 ปีที่แล้ว
Reading Ternary Phase Diagrams in Materials Science (Part 5: Complex Systems, MgO-Al2O3-SiO2)
Reading Ternary Phase Diagrams in Materials Science (Part 4: Intermediate Compounds)
มุมมอง 6K3 ปีที่แล้ว
Reading Ternary Phase Diagrams in Materials Science (Part 4: Intermediate Compounds)
Reading Ternary Phase Diagrams in Materials Science (Part 3: Melting, 4-phases, Invariant Reactions)
มุมมอง 3.2K3 ปีที่แล้ว
Reading Ternary Phase Diagrams in Materials Science (Part 3: Melting, 4-phases, Invariant Reactions)
Reading Ternary Phase Diagrams in Materials Science (Part 2: 2 & 3 Phase Solid-Liquid equilibria)
มุมมอง 2.4K3 ปีที่แล้ว
Reading Ternary Phase Diagrams in Materials Science (Part 2: 2 & 3 Phase Solid-Liquid equilibria)
Reading Ternary Phase Diagrams in Materials Science (Part 1: Overview; all solid equilibria)
มุมมอง 4.6K3 ปีที่แล้ว
Reading Ternary Phase Diagrams in Materials Science (Part 1: Overview; all solid equilibria)
Think like a Materials Engineer (The Different Length Scales of Structure in Materials Science)
มุมมอง 8493 ปีที่แล้ว
Think like a Materials Engineer (The Different Length Scales of Structure in Materials Science)
Orbitals and Electronic Band Structures (Part 8, 3D Band Diagrams: Direct and Indirect Band Gaps)
มุมมอง 8573 ปีที่แล้ว
Orbitals and Electronic Band Structures (Part 8, 3D Band Diagrams: Direct and Indirect Band Gaps)
Orbitals and Electronic Band Structures (Part 7, 2D Crystal Orbitals: p bands, final band diagram)
มุมมอง 1.2K3 ปีที่แล้ว
Orbitals and Electronic Band Structures (Part 7, 2D Crystal Orbitals: p bands, final band diagram)
Orbitals and Electronic Band Structures (Part 6, 2D Crystal Orbitals: the s Band)
มุมมอง 9303 ปีที่แล้ว
Orbitals and Electronic Band Structures (Part 6, 2D Crystal Orbitals: the s Band)
Orbitals and Electronic Band Structures (Part 5, p Orbital Bands in a 1D System)
มุมมอง 9903 ปีที่แล้ว
Orbitals and Electronic Band Structures (Part 5, p Orbital Bands in a 1D System)
Orbitals and Electronic Band Structures (Part 4, Polyenes Revisited: k Vectors for MO’s)
มุมมอง 5863 ปีที่แล้ว
Orbitals and Electronic Band Structures (Part 4, Polyenes Revisited: k Vectors for MO’s)
Orbitals and Electronic Band Structures (Part 3, s Orbital Bands in a 1D System)
มุมมอง 9893 ปีที่แล้ว
Orbitals and Electronic Band Structures (Part 3, s Orbital Bands in a 1D System)
Orbitals and Electronic Band Structures (Part 2, Crystal Orbitals and the k-vector)
มุมมอง 1.1K3 ปีที่แล้ว
Orbitals and Electronic Band Structures (Part 2, Crystal Orbitals and the k-vector)
Orbitals and Electronic Band Structures (Part 1: Molecular Orbitals in Polyenes, Bands in Metals)
มุมมอง 1.9K3 ปีที่แล้ว
Orbitals and Electronic Band Structures (Part 1: Molecular Orbitals in Polyenes, Bands in Metals)
Thank you very much for these 2 videos! Very helpful and visual
Glad they helped!
Dear Professor Peter Davies ! I would like to thank you so much for this precious and unique course. Chapeau Professor ! Now I got the big picture about band structures and the relation with high symmetry points. I am wandering Professor are these trainings related to some university program? If it is the case could you please share with me the link of the course, or a link where I can download these presentations. Thanks again Professor.
Thank you for your comments, I'm delighted this helped you. These videos are not associated with a university program, just my own contributions in an effort to help improve understanding for anyone who is interested.
Hi, dear Altruist, would it be possible for you to create a series of videos explaining TTT diagrams? Your videos are exceptionally well-made! The slides you prepare are not only packed with valuable technical insights but are also visually stunning. Your materials science content is undoubtedly among the very best on TH-cam!
Thank you for your kind comment; I will put TTT diagrams as a top priority for my next set of videos.
I wanted to let you know your comment spurred me to make a series of videos on TTT diagrams and Phase Transformations; i just uploaded them (3 parts) today; I hope you'll like them: part 1, th-cam.com/video/nOdbET2ZM_I/w-d-xo.html ; part 2 th-cam.com/video/EgU2HXrJ-lE/w-d-xo.html ; part 3, th-cam.com/video/XUB1wiKfbUk/w-d-xo.html
Outstanding
Thank you!
This is the best video I've seen on CSL, and the explanation is outstanding.
Thank you!
underrated video. Still have a lot to understand but this is one of the better videos I found on the subject
Very well explained sir
Thank you!
God will bless you on my behalf sir.
Thank you
Hello Peter, Your videos are simply great. Can you please arrange them in a sequence in a PlayList.
Thank you for the comment and the suggestion; I will work on creating the playlists you suggested
This is a great tutorial. It helps me a lot. Thank you for sharing.
Thank you glad it helped
Hard to find such a clear explanation even at university lectures.
Thank you
Hi, You said that low angle boundaries orientation is below 5degree however in the next slides there is an example that shows it as 10 degree in SrTiO3
Yes the 5 degree quote was an approximation, you can go a little higher.
Dear Professor Davies, I am having challenge conducting an isoplethal analysis in CaO-MgO-SiO2 ternary phase system for an overall composition of 49% CaO and 15% MgO. Please can you help on this? Thank you.
Can you tell me more about the issue?
Can’t be explained better than this. Thanks a lot.
Thank you!
Plz suggest book for this topic
This video series is really helpful. Thanks a lot
Thanks for the comment, glad to hear it was helpful
Thank you so much ,i needed this ❤
Excellent. finally someone has taken a step and made these videos and made them really simple.
Thank you!
Thank you so much for your help!
Glad it helped!
How can you tell when a binary reaction is either eutectic or peritectic?
Identify the solid phases and liquid involved; if the liquid composition is in between the solids it is a eutectic; if the liquid is outside both of the solid phases, it is a peritectic. Hope this makes sense.
Thank you Professor Davies, this is one of the best lectures i have ever heard.
Thank you so much
I watched the entire 8 episodes twice. The narration is graphic and logical, and helped me figure out where I could bring the charts from. Thank you for the sharing!
Thanks for the comment; I'm glad they were useful
Thank you, sir
Hello Prof. Thank you for those advanced material science topics. Very informative. Best wishes.
Thank you for your comment, I'm glad you enjoyed the videos
This was really helpful 🤍
Happy to hear it helped
Thank you professor.
teacher which app did you use to draw these 🫶🫶 ty for your explaination
These are all powerpoints
Very helpful. Thank you so much for making the video.
You are welcome, glad you enjoyed it
Impressive explanation.
Thank you!
nice expelention
Thank you!
Excellent. I worried going in that I was too rusty on binary phase diagrams but your explanation is so clear that I didn't have any issues at all.
Glad you enjoyed it!
i should go back and start from the 1st part. I really wished you picked a different composition on the pure MgO field
Thanks for the comment; if you do go back to the earlier videos hopefully you can select a composition near MgO and deduce the path (the primary phase will be MgO). I think you’ll find the paths are more straightforward than the other ones in this video as the only ternary invariant reaction that could be involved is the 1710C ternary eutectic where: L -> MgO + 2MgO.SiO2 + MgO.Al2O3 Let me know if you have any questions
Thank you very much for the explanation. The video makes very sense. I am able to understand watching but finding a little difficult reading and working problems. Can you please help me with invariant reaction in 1453,. also finding a composition of 40 Sio2, 15% Al2O3, i know the first solid to crystallize will be fosterite, and the second solid to crystallize is spinel. But i have a question, what will be the composition at when spinel starts to crystallize. and the amount of phase presents. Also what will be the solidification pathway and where the solidification ends, with the 40%Sio2 and 15%Al2O3 .i will be glad if you can help me with this 2 problems.
sir rotation axis 111, 001, 110 ? what doe it means
This is the direction perpendicular to the view on the slide; the grain is rotated around that direction (axis)
Very good explanation. Thank you.
Hello sir Is those space diagrams applied for ortho meta para nitro toluenes?
I'm not sure what information you are looking to learn for those systems; could you clarify?
@@peterdavies6179 ternary diagram for isomers of nitro toluenes
@@chaitanyananhore9969 I think you will find these are not applicable to their mixing
Excellent tutorial. Thank you
Glad you enjoyed it!
14:37 , sir can you tell me which compounds are incongruent mealting compound
Sure, A2B and AB2 melt incongruently as they yield a solid and liquid with different compositions when they melt. AB melts congruently and forms eutectics with A2B and AB2 (pure A and our B also melt congruently). Hope this makes sense.
Well explained
Thank You!
I searched a lot for a explanation how to get from orbitals to bands. Thank you a lot!
Happy to help!
I really enjoyed the orbitals and electronic band structures series videos! It was much more helpful than my whole semester of solid state physics. Thank you sir!
Glad it was helpful!
Great video! It helped me a lot in understanding the diagrams. I have a question about solid solubility. At 19:22 from the Si, Mo, Re diagram, can we say that the green point is a solid solution of MoSi2/Mo3Si2/ReSi?
The green point composition is a 3-phase mixture of MoSi2 + Mo3Si2 + ReSi. We would not say it is a "solid solution" of these three as that would imply they are soluble with each other when they are not. So a sample of this composition is inhomogeneous with regions of each of these 3 different phases; if they were soluble (a solid solution) it would be completely homogeneous in composition and structure. The relative amounts of the 3 phases that are present can be calculated from the tie-triangle.
I am a beginner at learning grain boundaries. Best video I have ever found!!!
Thank you, glad you found it helpful
Thank you very much for the nice explanation🙏🙏
really helpful! I would like send you an email for discussion if you do not mind
Thank you for explaining this very well! It was confusing at first, but helped at lot. Thank you sir.
Glad it helped!
Thank you for explaining this, very good video!
You're very welcome!
Beeeest Best Best 💎👑
Thank you!
Very nice models!
Thank you!
Clear (and funny!) explanation of the topic! Thank you Prof. Davies!
Thanks a lot for sharing. This is the best video I have ever seen teaching CSL!!!
Glad it was helpful!