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Depth-sensing ( instrumented ) indentation testing technique is a robust , reliable , convenient and non-destructive characterization method to study small-scale mechanical properties and rate-dependent plastic deformation in metals and alloys at ambient and elevated temperatures .
 indentation, mechanical properties, plastic deformation, metals, alloys, temperatures
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:
 indentation, mechanical properties, plastic deformation, metals, alloys, temperatures