2201
The following mechanisms contribute to the improved mechanical properties : ( 1 ) multiphase material system , ( 2 ) grain refinement , ( 3 ) substructures , ( 4 ) coherent multiscale interfaces and ( 5 ) nano-precipitations .
 mechanical properties, material, grain refinement
Please list all entity words in the text that fit the category. Output format is "word1, 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:
 mechanical properties, material, grain refinement