The arrangement of a material's constituents and crystallographic defects at scales relevant to its properties.
Estimating a phase volume fraction from the proportion of a representative line assigned to that phase. Sampling, orientation and phase identification must be appropriate. The width of a height feature on a differentially etched surface need not equal the phase intersection on the original flat section.
A recognizable constituent of a microstructure, which can itself contain more than one thermodynamic phase. Primary Bi-rich crystals and a two-phase eutectic microstructure are different microconstituents; counting them differs from counting the total Bi-rich and Sn-rich phase amounts.
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Microstructure refers to the structure of a material that is observed at a microscopic scale, typically ranging from about 1 nanometer to several millimeters. It encompasses the arrangement of particles, grains, phases, and other internal features that can influence a material's properties and behavior. In materials science and engineering, analyzing microstructure is crucial because it significantly affects mechanical, thermal, electrical, and chemical properties.