690
Thone observed significant improvement in ductility and fatigue strength after heat-treatment of SLM produced Ti6Al4V .
 machanical property: ductility; machanical property: fatigue strength; manufacturing process: SLM; material: Ti6Al4V
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; machanical property: fatigue strength; manufacturing process: SLM; material: Ti6Al4V