389
As the Al content increases , the α2 phase decreases , but the γ phase increases , and from the top region to the bottom region , the proportion of the α2 increases by about 52 at. % .
 As, Al, phase, phase
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, Al, phase, phase