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Using the Fe-Cr-Al ternary as a model system , we compare the phase fields in equilibrium and STeP diagrams to show that intermetallic phase fields are dramatically expanded under the rapid solidification conditions in melt-based additive manufacturing , an important effect that must be accounted for when designing composition gradients .
 material: Fe-Cr-Al; material: as; concept or principle: model; concept or principle: phase; concept or principle: equilibrium; concept or principle: STeP diagrams; material: intermetallic; manufacturing process: rapid solidification; manufacturing process: additive manufacturing; material: be; concept or principle: composition gradients
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: Fe-Cr-Al, as, model, phase, equilibrium, STeP diagrams, intermetallic, rapid solidification, additive manufacturing, be, composition gradients 
Answer:
 material: Fe-Cr-Al; material: as; concept or principle: model; concept or principle: phase; concept or principle: equilibrium; concept or principle: STeP diagrams; material: intermetallic; manufacturing process: rapid solidification; manufacturing process: additive manufacturing; material: be; concept or principle: composition gradients