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What is microstructure?
What is microstructure?
The very fine, micrometre-scale structure of a material, not visible to the naked eye, that is revealed at magnifications greater than 25X.
How can the term microstructure also encompass the nanostructure of a material?
How can the term microstructure also encompass the nanostructure of a material?
Some of the structural features can be observed with the naked eye, yet may be smaller than a micrometre, thus including the nanostructure of the material.
What does the microstructure define in conjunction with the crystal structure and chemical composition?
What does the microstructure define in conjunction with the crystal structure and chemical composition?
The properties of a material.
What is a phase in the context of materials?
What is a phase in the context of materials?
What can phase diagrams help us understand?
What can phase diagrams help us understand?
What will be the melting point of a 50:50 mixture/alloy of substances A and B?
What will be the melting point of a 50:50 mixture/alloy of substances A and B?
What is crystal structure?
What is crystal structure?
What disrupts the crystal symmetry and has a strong effect on material properties?
What disrupts the crystal symmetry and has a strong effect on material properties?
What are the different properties of diamond and graphite, and what causes these differences?
What are the different properties of diamond and graphite, and what causes these differences?
What type of crystals consist of numerous crystals of corundum?
What type of crystals consist of numerous crystals of corundum?
What is the difference between microstructure and crystal structure?
What is the difference between microstructure and crystal structure?
What is the arrangement of atoms/molecules in a material that has no symmetry?
What is the arrangement of atoms/molecules in a material that has no symmetry?
What is the term for the constant temperature state when pure A and B are cooled from the melt to their freezing points?
What is the term for the constant temperature state when pure A and B are cooled from the melt to their freezing points?
What is responsible for the thermal arrest observed during the formation of new bonds on solidification?
What is responsible for the thermal arrest observed during the formation of new bonds on solidification?
What is the name of the alloy of mutually soluble A and B that does not show a thermal arrest when solidifying?
What is the name of the alloy of mutually soluble A and B that does not show a thermal arrest when solidifying?
What is the freezing range between liquidus and solidus temperatures known as?
What is the freezing range between liquidus and solidus temperatures known as?
What is the term used for the line representing the coexistence of liquid and solid on a cooling curve?
What is the term used for the line representing the coexistence of liquid and solid on a cooling curve?
What is the requirement for the atomic radii of the solvent and solute elements according to the relative size factor?
What is the requirement for the atomic radii of the solvent and solute elements according to the relative size factor?
What happens if the Hume-Rothery rules are not obeyed?
What happens if the Hume-Rothery rules are not obeyed?
What is the meaning of 'eutectic' in Greek?
What is the meaning of 'eutectic' in Greek?
What is the significance of the eutectic system in binary combinations of elements?
What is the significance of the eutectic system in binary combinations of elements?
What are the metals that satisfy all the solid solution rules except for different atomic radii?
What are the metals that satisfy all the solid solution rules except for different atomic radii?
What is the requirement for the solute and solvent elements according to the relative valency factor?
What is the requirement for the solute and solvent elements according to the relative valency factor?
What is the lattice type factor based on?
What is the lattice type factor based on?
What is the requirement for the solute and solvent elements according to the electronegativity factor?
What is the requirement for the solute and solvent elements according to the electronegativity factor?
What type of phase diagram is quite common due to the difficulty in satisfying all the Hume-Rothery rules?
What type of phase diagram is quite common due to the difficulty in satisfying all the Hume-Rothery rules?
What is the eutectic point lower than in a eutectic system?
What is the eutectic point lower than in a eutectic system?
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Study Notes
- Dr. Vassili Vorontsov of the University of Strathclyde discusses crystal structures and material properties.
- Crystal structure is the arrangement of atoms/molecules in a material with translational symmetry.
- Different crystal structures lead to varying properties for materials. For example, diamond is hard, transparent, and insulating while graphite is soft, opaque, and conductive.
- Crystal defects disrupt symmetry and impact material properties. For instance, natural sapphires have impurities that make them blue while man-made sapphires are colorless.
- Most materials used in engineering are not single crystals but rather polycrystalline, consisting of numerous crystals within a material.
- Microstructure refers to the fine, micrometre-scale arrangement of crystals, phases, and defects within a material. It influences material properties alongside crystal structure and chemical composition.
- Understanding the concept of phases is crucial in materials science. A phase is a region of space with uniform physical properties.
- Substances A and B have different melting points but form a solid solution when mixed instead of having a defined melting point.
- The solidification process releases energy known as the latent heat of fusion.
- The Hume-Rothery rules determine the solubility and formation of alloys based on the relative valency, electronegativity, size, and lattice type of elements.
- Failure to satisfy these rules can lead to miscibility gaps and congruent or eutectic melting points.
- The eutectic system, a common type of phase diagram, features a eutectic point with a lower melting point than the pure components.
- Eutectic comes from the Greek word for "easy-melting."
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