Glossary 1. Alloy A metallic alloy is a mixture of a metal with other metals or non-metals. Ceramics can also be mixed to form alloys. Binary alloys are alloys of two elements only. See also: Intermetallics 2. Atomic Percentage Synonyms: at%; atomic percent Atomic percentage signifies atomic percentage, so Cu/Al 73/27 at would have 27%...Continue Reading