metallic glass.pptx

metallic glass

1. UNIT-III SMART MATERIALS TOPIC : METALLIC GLASSES 03.08.2020 FN.

2. METALLIC GLASS

3. CONTENTS DEFINITION PROPERTIES TYPES GLASS TRANSITION TEMPERATURE PREPARATION

4. METALLIC GLASS The material which has both metal and glasses is known as metallic glass or metglass . M etallic glasses have no long-range of ordering like crystalline materials.  Metallic glasses are metal alloys.

5. G lass is an amorphous, brittle and transparent solid material. I t is not a metallic and does not exhibit ferro magnetism. M etals are mellable,ductile and exhibit crystalline properties. Metallic Glass share the both properties.

6. Properties Strong D uctile Mealleable Opaque Brittle.

7. Properties Stength of the metallic glass is very high. Light in weight. Hardness is very high. Toughness is very high. Fracture resistance is very high.(More than Ceramics) High Elasticity. High Corrosion Resistance. do not contain any Crystalline defects.

8. T ypes of glasses metal-metal metallic glass Combination of (metal-metal) Example: nickel-niobium magnesim -zinc copper-zirconium hafnium-vanadium.

9. metal-metalloid metallic glass Combination of metal and metalloids.( A  metalloid  is a chemical element that exhibits some properties of metals and some of nonmetals .) Examples: Metal Metalloid Fe, Co, Ni B, Si, C,P

10. Glass Transition Temperature When an amorphous polymer is heated, the temperature at which the polymer structure turns “viscous liquid or rubbery" is called the Glass Transition Temperature, Tg

11. P reparation/Principle Extreme rapid cooling of molten metal alloys(Quenching),is retained into the solid. I t can be produced easily and cheaply because they can produced directly from molten alloys.

12. production methods(Ribbons Of Metallic Glasses) Melt Spinning System Twin Roller System Melt Extraction system.

13. Melt Spinning System

14. Twin Roller System Molten Alloys Passed Through the Two rollers rotating in opposite Directions.

15. Melt Extraction system Fast moving Roller Sweeps off the molten droplet into a strip from a solid rod.

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