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Melt pool geometry and temperature distribution was obtained for different heat sources and different materials such as Ti6Al4V , Stainless Steel 316 , and 7075 Aluminum powders .
 material: Melt pool; concept or principle: geometry; process parameter: temperature; concept or principle: distribution; concept or principle: heat sources; concept or principle: materials; material: as; material: Stainless Steel; material: Aluminum
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: Melt pool, geometry, temperature, distribution, heat sources, materials, as, Stainless Steel, Aluminum 
Answer:
 material: Melt pool; concept or principle: geometry; process parameter: temperature; concept or principle: distribution; concept or principle: heat sources; concept or principle: materials; material: as; material: Stainless Steel; material: Aluminum