With regard to phase diagrams: theta is the name given to a phase. The theta phase is a commonly a mixture of an intermetallic solid and either another intermetallic solid or an element. In the Cu-Al phase diagram theta is an intermetallic solid of composition around 54wt%Cu.
Associated terms: Intermetallic Compound, Alpha, Beta, Gamma, Binary Phase Diagram, Austenite, wt%
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