The experimental set-up of laser processing.
The processing comparability of CNL and WJGL.
SEM photos and mapping results of WJGL processed interface and materials matric.
GA, UNITED STATES, September 5, 2026 /EINPresswire.com/ — Precise micromachining of refractory high-entropy alloys retains a big problem for inherent brittleness and low thermal conductivity. On this work, water-jet guided laser know-how allows a better micromachining high quality in contrast with CNL and femtosecond laser. Notably, WJGL reduces the heat-affected zone (HAZ) to 298 nm, ~99.1% decrease than that of CNL. The fabric elimination mechanism and microstructural evolution are elucidated. This work supplies a dependable route for precision manufacturing of hard-to-process RHEAs.
Excessive-entropy alloys are extremely promising structural and useful supplies. Amongst them, refractory high-entropy alloys possess excellent high-temperature mechanical properties and have broad utility prospects in vital parts below excessive working circumstances resembling aerospace, nuclear energy, and fuel generators. Nevertheless, the intrinsic traits of any such materials, resembling excessive hardness, brittleness and poor thermal conductivity, are extremely prone to trigger microcracks and thermal harm throughout processing, posing a big problem to high-precision micromachining at room temperature. Laser machining is an efficient know-how for micro precision manufacturing, nevertheless, in view of the refractory excessive entropy alloys processing analysis centered on nanometer supplies preparation and floor modification, and the normal processing means additionally exacerbate the workpiece thermal harm, holes and floor defects. Due to this fact, tips on how to overcome the thermal impact introduced by the laser processing is the important thing to enhancing the processing and manufacturing of refractory high-entropy alloys.
What’s the water jet guided laser processing know-how?
This know-how is using water-jet and shielding fuel as waveguide to couple laser. The waveguide construction fashioned by the refractive index distinction between the high-pressure water jet and the protecting fuel is utilized, with the water jet because the core and the protecting fuel and air because the cladding. Whole reflection happens when the laser is coupled right into a water jet with a diameter of solely 50 μm. There isn’t any want to contemplate the main focus place and Rayleigh size in the course of the processing. As a high-performance precision processing technique, water jet-guided laser processing know-how integrates a number of capabilities resembling laser ablation, in-situ cooling and residue scouring. This know-how can successfully suppress thermal harm, obtain a clear processing interface and guarantee processing accuracy, with important processing benefits.
Processing Benefit 1: Clear Processing Interface
The analysis crew evaluated the processing results of varied lasers by evaluating the microscopic morphology of the grooves. The perimeters of the grooves processed by conventional nanosecond and femtosecond lasers have apparent slag and sputtering residues, and there’s a important taper. The EDS outcomes present that these redeposits are primarily oxides. Nevertheless, the grooves processed by WJGL current a vertical profile and a smoother inside wall. That is primarily because of the scouring impact of the water jet, which considerably reduces the deposition of slag and sputtering residues.
Processing Benefit 2: Extremely-thin Warmth-Affected Zone
The water jet not solely reduces the buildup of warmth throughout processing, but in addition has the protecting impact of blocking air, successfully decreasing the oxidation response between the alloy and air below excessive temperatures. The notable characteristic of the heat-affected zone (HAZ) after processing is a better oxygen content material. It’s price noting that the width of the heat-affected zone after WJGL processing ranges from 298 to 702 nm, whereas the width of the heat-affected zone after CNL processing is 31.6 micrometers. Due to this fact, the WJGL know-how successfully reduces the era of oxides on the processing interface, considerably reduces the processing affect, and maximally maintains the inherent properties of the fabric.
Processing Benefit 3: Extremely-low taper drilling
Within the WJGL know-how, the laser has an extended vitality transmission distance and a extra uniform vitality distribution within the water jet, which provides important benefits in enhancing the standard of the drilling. By analyzing the floor profile of a drilling gap with a depth-to-diameter ratio of three.53, the outcomes present that the radius and floor roughness of the outlet from the processing entrance to the processing exit are extremely constant, with the floor roughness variation being lower than 1 micron. The calculated taper is the bottom at solely 0.014°. Due to this fact, the WJGL know-how has top quality traits in micro-drilling with low roughness and excessive consistency.
References
DOI
10.37188/lam.2026.099
Authentic Supply URL
https://doi.org/10.37188/lam.2026.099
Funding info
This work was supported by Nationwide Key Analysis and Growth Program of China (Grant quantity 2023YFE0200200), and Nationwide Pure Science Basis of China (grant quantity U2141205，52171096).
Lucy Wang
BioDesign Analysis
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