Engineering Materials
A small percentage of boron is added to steel in order to

Increase wear resistance
Increase endurance strength
Reduce machinability
Increase hardenability

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Engineering Materials
Aluminium bronze contains

10% aluminium and 90% copper
94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe
90% magnesium and 9% aluminium with some copper
92.5% aluminium, 4% copper, 2% nickel, and 1.5% Mg

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