Engineering Materials
Amorphous material is one

Which is not attacked by phosphorous
Which emits fumes on melting
In which there is no definite atomic structure and atoms exist in a random pattern just as in a liquid
In which atoms align themselves in a geometric pattern upon solidification

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Engineering Materials
Dow metal contains

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

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Engineering Materials
In a hardening process, the hypo-eutectoid steel is

Heated below or closes to the lower critical temperature and then cooled slowly
Heated from 30°C to 50°C above the upper critical temperature and then cooled suddenly in a suitable cooling medium
Heated from 30°C to 50°C above the upper critical temperature and then cooled in still air
Heated from 30°C to 50°C above the upper critical temperature and then cooled slowly in the furnace

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