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Design Technology > Metals > Flashcards

Metals Flashcards

1
Q

Ferrous Metals

A

Metals that contain iron

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2
Q

Examples of Ferrous Metals

A

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

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3
Q

Examples of Non-Ferrous Metals

A

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

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4
Q

Tensile Strength

A

Withstanding force when stretched

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5
Q

Compressive Strength

A

Withstanding force when being crushed

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6
Q

Durability

A

Withstanding wear and tear and withering

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7
Q

Flexibility

A

How easily a material will bend or distort

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8
Q

Plasticity

A

Changing in shape permanently without cracking or bending

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9
Q

Elasticity

A

The ability to regain its original shape after being deformed

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10
Q

Malleability

A

The ability to be easily presses, spread or hammered into shape

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11
Q

Ductility

A

The ability to be stretched and permanently deformed without breaking

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12
Q

Brittleness

A

How easily a material will break without bending(opposite to ductile)

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13
Q

Hardness

A

Resistance to scratching, cutting, denting and wear

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14
Q

Toughness

A

Resistance to sudden shock without breaking or deforming

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15
Q

Impact Resistant

A

Resisting denting

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16
Q

Shear

A

Strong sliding forces acting opposite to each other

17
Q

Stress

A

Any forces acting on a material

18
Q

Electrical Conductivity

A

How easily a material allows electricity to flow through it

19
Q

Thermal Conductivity

A

How easily a material allows heat to flow through it

20
Q

Chemical Resistance

A

Resists chemical attack

21
Q

Welding

A

Pieces of metal are melted together along the joints fusing together as they cool.

22
Q

Bolts

A

Nuts bolts and washers are when a joint needs to be taken apart

23
Q

Pop Rivets

A

Enable you to complete the joint while holy having access to one side of the work, usually used for joining sheets together

24
Q

Hardening and Tempering

A

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

25
Q

Sand Casting

A

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

26
Q

Die Casting

A

Molten metal is poured into the dye under high pressure and forced through a cavity. Pushed into the shape- similar to injection moulding

27
Q

Pressing and Stamping

A

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

28
Q

Milling

A

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

29
Q

Dip Coating

A

The dipping of metal components into thermoplastic powders

30
Q

Galvanising

A

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

31
Q

Smart Alloys

A

A smart material that can remember its original shape for example copper, zinc and aluminium

32
Q

Non-Ferrous Metals

A

Metals that do not contain iron

Design Technology (2 decks)

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