This is the 13182nd most frequent Russian word.
микроструктуру
"Microstructure" – the small-scale structure of a material or system, often observed microscopically.
Here, 'микроструктуру' is used in the accusative case as the direct object of the verb 'изучили', meaning the structure of a material on a microscopic scale.
Исследователи изучили микроструктуру металла под микроскопом.
The researchers studied the microstructure of the metal under a microscope.
In this sentence, 'микроструктуры' is in the genitive case following the preposition 'для', which indicates the purpose of the analysis.
Для анализа микроструктуры использовали специальное оборудование.
Special equipment was used for the analysis of the microstructure.
Here, 'микроструктура' functions as the subject of the sentence, denoting how the microscopic arrangement of the alloy relates to its properties.