There are many various types of Metals and metal alloys. Magnesium is one of the lightest metals. Aluminum alloys is next. Steel alloys and Lead and Gold are the heaviest metals.
Many alloys are made by melting metals and mixing them together in carefully measured amounts.
Alloys contain metals but also nonmetals.
Plutonium can form many alloys with other metals.
Alloys are several metals, and possibly some other substances, mixed together.
Alloys are not necessarily harder or stronger than pure metals. For example gallium and aluminum form an alloy that is extremely weak. Many of the alloys we know of are stronger than pure metals because those are the ones we find most useful. In most pure metals, there will be gaps in between atoms. In many alloys we fill in those gaps with some other type of atom, adding extra support.
Metals.
alloys
Alloys
Cobalt form many important alloys with other metals.
alloys are probably cheaper to make and stonger then an element or a simple metal. Alloys are easier to make. It is difficult to find a simple metal.
Alloys have improved features compared with single metals.