New 3D Metal Printing Technology Creates Alloys on Demand

Experts from the National Institute of Standards and Technology (NIST) have developed a 3D metal printing method that enables alloy mixing directly during production. Instead of traditional straight laser trajectories, the technology uses elliptical loops to stir molten metal before it solidifies. This addresses the issue of metal separation due to varying densities and melting points, a common challenge in conventional casting methods.

To test the method’s effectiveness, scientists combined the high-entropy alloy RHEA-19 with a titanium alloy. Real-time monitoring of the fusion process was conducted using X-ray diffraction at the Advanced Photon Source accelerator in Argonne National Laboratory. Results demonstrated successful metal mixing, forming a uniform alloy rather than segregating into weak zones.

A key advantage of the technology is that it requires no equipment replacement—only a software update. Existing metal 3D printers can adapt to the new method after installing specialized software developed by the NIST team. This opens opportunities for producing components with gradient properties, such as turbine blades, where material composition transitions smoothly without weld seams.

Researchers note that the method can be used for "on-demand" alloy production, mixing elemental metal powders in desired proportions. This reduces reliance on pre-prepared materials and expands the possibilities of additive manufacturing in industry.