Liangju He

Hypervelocity Impact Response of Al-Sc and Al-Ti Targets

Al-Sc and Al-Ti semi-infinite targets were impacted by stainless steel projectiles with velocity range of 0.6–1.9 km/s. It was found that the Al-Sc targets demonstrated a much better ability to resist hypervelocity impact. It is concluded that different microstructures of Al-Sc and Al-Ti alloys, including different grain sizes and secondary particles precipitated in the matrix, result in their greatly different abilities to resist impact.

Effect of Dual-Sided Laser Peening Modes on Residual Stress Distribution of Aero-engine Titanium Blades

For thin-walled structure components, dual-sided laser peening modes greatly affect surface integrity of the components. In this study, simplified compressor blade made of TC17 titanium alloy was chosen as the studied object. The effect of simultaneous and non-simultaneous dual-sided laser peening on residual stress distributions along surface and depth were studied through numerical simulation. The influencing mechanisms of dual-sided laser peening modes on residual stress distribution along depth were investigated by means of wave propagation theory. This study is instructive in parameter choosing for laser peening of thin-walled structure components based on better understanding the effect of dual-sided laser peening modes on residual stress distribution.

Laser Ablation of Aluminum and Titanium Alloys Under Glass Confinement

Single-pulse laser ablation of aluminum and titanium alloys under glass confinement is investigated. Processing parameters such as laser intensity and gap width between targets and glass are varied. Surface morphologies and crater profiles of the alloys after laser ablation are studied by SEM and white-light interferometric microscope, respectively. The effects of gap width and laser intensity on surface morphologies and crater profiles of targets are systematically analyzed. In addition, the generation of porous surface structures in Ti target is regarded as the result of phase explosion in the molten surface layer of targets and the thermodynamic condition in our experiment for phase explosion is evaluated.