5503
Although prior-β columnar grains were observed in both Ti-6Al-4V and LaB6-modified Ti-6Al-4V ( Ti-6Al-4V-LaB6 ) , the width of the columnar grains decreased significantly with LaB6 addition .
 columnar grains, Ti-6Al-4V, Ti-6Al-4V, columnar grains
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:
 columnar grains, Ti-6Al-4V, Ti-6Al-4V, columnar grains