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They revealed that the tensile strength of heat-treated Ti6Al4V slightly decreased from 1080 MPa to 945 MPa but the elongation at failure increased significantly from 1.6 % to 11.6 % , along with remarkably prolonged fatigue life of parts from 28,900 to 290,000 cycles .
 machanical property: tensile strength; manufacturing process: heat-treated; concept or principle: MPa; concept or principle: MPa; machanical property: elongation; concept or principle: failure; machanical property: fatigue life
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: tensile strength; manufacturing process: heat-treated; concept or principle: MPa; concept or principle: MPa; machanical property: elongation; concept or principle: failure; machanical property: fatigue life