What is an amorphous solid?
An amorphous solid has the random internal structure of a liquid. In contrast to an amorphous solid, a crystalline solid possesses an ordered, periodic internal structure forming a latticework. Usually, if you cool a liquid it solidifies into a crystalline structure. However, if cooling is very rapid then the liquid solidifies without forming any crystalline structure. This is true for liquid (melted) multi-component metallic alloys (alloys which include two or more kinds of atoms).