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Metallurgy is a chapter of Materials Engineering that studies the behaviour (Mechanical, Physical and Chemical) of elemental metals (e.g. aluminium, iron, titanium, nickel etc.) or alloys (steel (Fe-C), brass (Cu-Zn), duralumin (Al-Cu) etc.). Unlike Mechanical Engineers, Metallurgists study the micromechanisms that cause a metal or alloy to behave in the way that it does, i.e. the changes that occur on the atomic level that affect the metal's (or alloy's) macro-properties.