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Aluminum alloy ( 6061 ) builds , fabricated using ultrasonic additive manufacturing , were post-weld heat treated at 180 , 330 and 580 °C .
 material: Aluminum alloy; process characterization: builds; concept or principle: fabricated; manufacturing process: ultrasonic additive manufacturing; manufacturing process: post-weld heat treated
Please list all entity words in the text that fit the category.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} 
Answer:
 material: Aluminum alloy; process characterization: builds; concept or principle: fabricated; manufacturing process: ultrasonic additive manufacturing; manufacturing process: post-weld heat treated