Engineering Materials
Thermoplastic materials are those materials which

Are formed into shape under heat and pressure and results in a permanently hard product
Are used as a friction lining for clutches and brakes
Do not become hard with the application of heat and pressure and no chemical change occurs
Are flexible and can withstand considerable wear under suitable conditions

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Engineering Materials
Y-alloy contains

3.5 to 4.5% copper, 0.4 to 0.7% magnesium, 0.4 to 0.7% manganese and rest aluminium
4 to 4.5% magnesium, 3 to 4% copper and rest aluminium
5 to 6% tin, 2 to 3% copper and rest aluminium
3.5 to 4.5% copper, 1.2 to 1.7% manganese, 1.8 to 2.3% nickel, 0.6% each of silicon, magnesium and iron, and rest aluminium

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Engineering Materials
Combined carbon in iron makes the metal

Hard and gives a coarse grained crystalline structure
Hard and gives a fine grained crystalline structure
Soft and gives coarse grained crystalline structure
Soft and gives a fine grained crystalline structure

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