Final answer:
The statement is false as microconstituents usually refer to small structures within a material and can be a single phase or part of a multi-phase material where each microconstituent is a different phase.
Step-by-step explanation:
The statement "microconstituents are more than one phase" is false. Microconstituents are typically used to refer to small structures within a material that could consist of a single phase. However, microconstituents can exist within multi-phase materials, where each microconstituent is a different phase of the material.