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The ductility of the heat-treated joints at 650 °C was better than that at room temperature because more slip systems were activated in the O phase .
 machanical property: ductility; manufacturing process: heat-treated; process parameter: temperature; 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:
 machanical property: ductility; manufacturing process: heat-treated; process parameter: temperature; material: O