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Compared with the joints heat-treated in HT1 , the joints after HT2 exhibited better ductility at 650 °C resulting from the coarse primary O laths and lower volume fraction of O phase .
 manufacturing process: heat-treated; machanical property: ductility; material: O; process parameter: volume fraction; material: O
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:
 manufacturing process: heat-treated; machanical property: ductility; material: O; process parameter: volume fraction; material: O