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Electrically Assisted Ultrasonic Nanocrystal Surface Modification of Ti6Al4V Alloy
Author(s) -
Liu Jun,
Suslov Sergey,
Li Shengxi,
Qin Haifeng,
Ren Zhencheng,
Doll Gary L.,
Cong Hongbo,
Dong Yalin,
Ye Chang
Publication year - 2018
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201700470
Subject(s) - materials science , nanocrystal , severe plastic deformation , annealing (glass) , alloy , nanoscopic scale , surface modification , titanium alloy , composite material , dislocation , resistive touchscreen , metallurgy , deformation (meteorology) , nanotechnology , chemical engineering , engineering , electrical engineering
In this study, an innovative process, electrically assisted ultrasonic nanocrystal surface modification (EA‐UNSM), is used to process Ti6Al4V alloy. As compared with traditional UNSM, EA‐UNSM results in lower dislocation density and larger grains due to the thermal annealing effect caused by resistive heating. In addition, deeper plastic deformation layer is observed in the electrically assisted case. By supplying mechanical energy and thermal energy simultaneously, a strong dynamic precipitation effect is induced, which generates nanoscale precipitates in the EA‐UNSM‐treated Ti6Al4V alloy. These nanoscale precipitates can effectively pin dislocations during plastic deformation and thus significantly improve the surface hardness.