Residual Stress, Mechanical Properties, and Grain Morphology of Ti-6Al-4V Alloy Produced by Ultrasonic Impact Treatment Assisted Wire and Arc Additive Manufacturing. - Yang, Yichong; Jin, Xin; Liu, Changmeng; Xiao, Muzheng; Lu, Jiping; Fan, Hongli; Ma, Shuyuan (Metals (2075-4701), 2018)