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This work aims to investigate the influence of the orientation and microtexture of columnar grains on the fatigue crack growth of a Ti-6.5Al-2Zr-Mo-V titanium alloy fabricated by directed energy deposition .
 orientation, columnar grains, fatigue crack growth, Ti-6.5Al-2Zr-Mo-V titanium alloy, fabricated, directed energy deposition
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:
 orientation, columnar grains, fatigue crack growth, Ti-6.5Al-2Zr-Mo-V titanium alloy, fabricated, directed energy deposition