6476
The directional growth tendency of α-Al2O3 cellular dendrites that were discretely distributed in the Al6Ti2O13 matrix phase weakened , and the secondary dendrites gradually developed by increasing the scanning speed .
 dendrites, phase, secondary dendrites, scanning speed
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:
 dendrites, phase, secondary dendrites, scanning speed