Metals Flashcards
Ferrous Metals
Metals that contain iron
Examples of Ferrous Metals
Mild steel- used in school workshops and engineering products, tough, rusts easily
Carbon steel- tough and can be hardened and tempered, cuts tools like drills
Stainless steel- tough, resistant to stains and rust, musical instruments and cutlery
Examples of Non-Ferrous Metals
Aluminium- ductile, malleable and very light, used for window frames and aircrafts
Copper- conducts electricity and heat, used for kettles and pipes
Zinc- hard, brittle and very weak , used to galvanise steel and coating for screws
Tensile Strength
Withstanding force when stretched
Compressive Strength
Withstanding force when being crushed
Durability
Withstanding wear and tear and withering
Flexibility
How easily a material will bend or distort
Plasticity
Changing in shape permanently without cracking or bending
Elasticity
The ability to regain its original shape after being deformed
Malleability
The ability to be easily presses, spread or hammered into shape
Ductility
The ability to be stretched and permanently deformed without breaking
Brittleness
How easily a material will break without bending(opposite to ductile)
Hardness
Resistance to scratching, cutting, denting and wear
Toughness
Resistance to sudden shock without breaking or deforming
Impact Resistant
Resisting denting
Shear
Strong sliding forces acting opposite to each other
Stress
Any forces acting on a material
Electrical Conductivity
How easily a material allows electricity to flow through it
Thermal Conductivity
How easily a material allows heat to flow through it
Chemical Resistance
Resists chemical attack
Welding
Pieces of metal are melted together along the joints fusing together as they cool.
Bolts
Nuts bolts and washers are when a joint needs to be taken apart
Pop Rivets
Enable you to complete the joint while holy having access to one side of the work, usually used for joining sheets together
Hardening and Tempering
Intense heat is applied and the metal is cooled slowly depending on the carbon in the steel, so when the metal is cooled it is softer and therefore easier to bend or hit. It is then reheated to give the metal its original properties back
Sand Casting
Place a pattern in a sand to create a mold, incorporate the pattern and sand in the grating system, remove the pattern and fill the mold with molten metal, allow the metal to cool and break away the sand mold and remove the casting
Die Casting
Molten metal is poured into the dye under high pressure and forced through a cavity. Pushed into the shape- similar to injection moulding
Pressing and Stamping
Fabrication from a thin sheet of metal into an object that cannot be unbended. Place metal sheet into a blank or coil form into a stamping press where a tool and die surface forms the metal into a net shape, used in aircrafts
Milling
Uses rotary cutters to remove material, programmed control that moves up and down vertically on an axis while the table moves horizontally against the milling cutter. Good for high speed and accuracy but expensive
Dip Coating
The dipping of metal components into thermoplastic powders
Galvanising
Applying zinc coating to steel or iron to prevent it rusting. Most common way is dipping metal components into a bath of molten steel predicting corrosive stub stances from reaching the most delicate part of the metal
Smart Alloys
A smart material that can remember its original shape for example copper, zinc and aluminium
Non-Ferrous Metals
Metals that do not contain iron
