Laser Shock Forming of Metallic Materials

Laser shock forming (LSF) utilises short, intense laser pulses to induce high‐pressure shock waves that plastically deform metallic surfaces and thin sheets without significant heat input. A typical arrangement involves focusing a pulsed laser on an ablative layer adjacent to the workpiece, under a transparent confinement medium. The rapid plasma expansion generates a shock pressure that greatly exceeds the dynamic yield strength of the metal, driving material flow at strain rates often above 10³ s⁻¹. This technique enables complex geometries, fine microstructural refinement and surface hardening while minimising thermal damage. LSF has been demonstrated on a wide range of alloys, including aluminium, copper and stainless steels, and scales from micro-bulges and micro-punching to large-area forming. Key advantages include the capacity for single-step, tool-less processing, enhancement of mechanical properties through grain refinement and residual compressive stresses, and applicability to conventionally difficult-to-form materials. As a versatile, environmentally benign alternative to mechanical stamping, LSF holds significant promise for aerospace structural components, precision micro-devices and advanced mould manufacture, reinforcing its global importance in high-performance manufacturing and microfabrication.

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Laser Shock Forming of Metallic Materials publication trend

The graph below shows the total number of articles in laser shock forming of metallic materials across all publications each year (not limited to Nature Index journals).

Technical terms

Laser-induced shock wave: A high-pressure stress wave generated when an intense laser pulse vaporises an ablative layer, producing plasma expansion.

Confinement layer: A transparent medium (often water or glass) placed over the ablative coating to trap plasma and amplify shock pressure.

High strain rate forming: Deformation occurring at rates above 10³ s⁻¹, leading to unique plastic flow and material hardening effects.

Rebound effect: Elastic recovery of the workpiece following shock unloading, which can impair final geometry accuracy if not controlled.

References

1. Improving the Forming Quality of Laser Dynamic Flexible Micropunching by Laser Pre-Shocking. Materials (2020).
2. Reducing the Rebound Effect in Microscale Laser Dynamic Forming through Multi-Pulse Laser Shock Loading. Metals (2024).
3. Fabrication of a Hot-Embossing Metal Micro-Mold through Laser Shock Imprinting. Materials (2023).