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As a result , titanium was seen to exhibit the highest local temperatures and largest melt pools , followed by steel and aluminum in decreasing order .
 As, titanium, temperatures, melt pools, steel, aluminum
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:
 As, titanium, temperatures, melt pools, steel, aluminum