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The results of this study are indicative that powder bed heating may be used to assist with successful fabrication of AA6061 and other alloy systems susceptible to additive manufacturing solidification cracking .
 machine or equipment: powder bed; manufacturing process: heating; material: be; manufacturing process: fabrication; material: AA6061; material: alloy; concept or principle: additive manufacturing solidification
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: powder bed, heating, be, fabrication, AA6061, alloy, additive manufacturing solidification 
Answer:
 machine or equipment: powder bed; manufacturing process: heating; material: be; manufacturing process: fabrication; material: AA6061; material: alloy; concept or principle: additive manufacturing solidification