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In this study , post-heat treatment was used to regulate the morphology and size of the Laves phase in Inconel 718 fabricated using laser directed energy deposition , and the dissolution behavior of the Laves phase during solution heat treatment was investigated .
 concept or principle: morphology; concept or principle: Laves phase; material: Inconel 718; concept or principle: fabricated; manufacturing process: laser directed energy deposition; concept or principle: Laves phase; manufacturing process: solution heat treatment
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: morphology, Laves phase, Inconel 718, fabricated, laser directed energy deposition, Laves phase, solution heat treatment 
Answer:
 concept or principle: morphology; concept or principle: Laves phase; material: Inconel 718; concept or principle: fabricated; manufacturing process: laser directed energy deposition; concept or principle: Laves phase; manufacturing process: solution heat treatment