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Microstructure analysis of the aB-built components demonstrated that SLM can be used to produce a very fine grain microstructure with nano-scale precipitates and non-detrimental Fe segregation .
 concept or principle: Microstructure; machine or equipment: components; manufacturing process: SLM; material: be; concept or principle: grain; concept or principle: nano-scale; material: Fe
Given options, please tell me the categories of all the listed entity words.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} 
 Entities: Microstructure, components, SLM, be, grain, nano-scale, Fe 
Answer:
 concept or principle: Microstructure; machine or equipment: components; manufacturing process: SLM; material: be; concept or principle: grain; concept or principle: nano-scale; material: Fe