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In the current study , effects of various processing parameter such as impact velocity , substrate preheating temperature , a combination of different materials and coefficient of friction were used to describe the impact behaviour of ductile materials ( copper , Cu , and aluminium , Al ) after deposition to find a way of addressing high-strain-rate dynamic problems .
 parameter, as, substrate, preheating, materials, coefficient of friction, impact, ductile, copper, Cu, aluminium, Al, deposition, dynamic
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:
 parameter, as, substrate, preheating, materials, coefficient of friction, impact, ductile, copper, Cu, aluminium, Al, deposition, dynamic