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The compositional gradation approach showed a gradual transition of Inconel 718 and GRCop-84 elements at the interface , which was also reflected in the crosB-sectional hardness profile across the bimetallic interface .
 concept or principle: transition; material: Inconel 718; material: elements; concept or principle: interface; machanical property: hardness; concept or principle: interface
Given options, please tell me the categories of all the listed entity words.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} 
 Entities: transition, Inconel 718, elements, interface, hardness, interface 
Answer:
 concept or principle: transition; material: Inconel 718; material: elements; concept or principle: interface; machanical property: hardness; concept or principle: interface