context: If alloying materials do not dissolve in all proportions, phase separation may occur in the alloy structure. In this case, for example, microscopic images show distinct areas of difference. Multiphase alloys may be alloys of metals, for example, lead and tin alloys. They may also be alloys and compound compounds, such as iron (ferrite) and cementite (Fe3C, iron carbide). Multiphase alloys have many different structures.
question: What is meant by multiphase mixtures?
answers.text: alloying materials do not dissolve in all proportions, phase separation may occur in the alloy structure