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The evolution and spatial variations of phase fractions , α lath width and dislocation density are presented , to provide an assessment of the resulting microstructure-sensitivity of mechanical properties .
 concept or principle: evolution; engineering feature: spatial variations; concept or principle: phase fractions; machanical property: dislocation density; concept or principle: mechanical properties
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
Answer:
 concept or principle: evolution; engineering feature: spatial variations; concept or principle: phase fractions; machanical property: dislocation density; concept or principle: mechanical properties