Gradient-structured 1060 aluminum by air pressure-driven surface mechanical rolling treatment and its effects on the friction performance

Microstructure Evolution and Numerical Modeling of TC4 Titanium Alloy during Ultrasonic Shot Peening Process

“…Past studies have proven that surface nanocrystallization (SNC) is the most effective and promising method, which induces severe plastic deformation (SPD) on the surface of metallic materials [6,7],providing a very effective potential approach for achieving microstructure refinement and enhancing the overall properties of TC4 titanium alloy. Currently, surface nanocrystallization techniques such as laser shock peening (LSP) [8][9][10], surface mechanical attrition treatment (SMAT) [11][12][13], surface mechanical rolling treatment (SMRT) [14][15][16], equal-channel angular pressing (ECAP) [17][18][19] and ultrasonic shot peening (USP) [20] are widely used to achieve grain refinement and the surface integrity enhancement of materials, aiming to improve the fatigue resistance and wear resistance of titanium alloys during service. Li et al [21] investigated the strengthening effect of ultrasonic surface rolling at low temperatures, and demonstrated a significant enhancement of residual stress and wear properties at 120 • C. Liu et al [22] obtained an extremely strong surface nanocrystalline layer for Ti64 after laser-assisted ultrasonic nanocrystal surface modification (LA-UNSM), showing a 75.2% increase in hardness.…”