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In all these cases except the Stellite 6 hardfaced tool , the shoulder and pin are found to deform plastically with significant wear of shoulder along with the diffusion of CuCrZr into tool from tool pin-shoulder interface .
 material: Stellite; machine or equipment: tool; concept or principle: wear; concept or principle: diffusion; machine or equipment: tool; machine or equipment: tool; concept or principle: interface
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:
 material: Stellite; machine or equipment: tool; concept or principle: wear; concept or principle: diffusion; machine or equipment: tool; machine or equipment: tool; concept or principle: interface