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What are amorphous metals? | TRUMPF

What are amorphous metals?

Amorphous metals are also called metallic glasses and are quite extraordinary all-round talents. Although they are extremely strong, they are also highly elastic, making the unique nature of metallic glasses possible. Compared to crystalline materials, amorphous metals do not have an ordered lattice structure. This is created by the melt's high cooling rate. This prevents an even distribution of the atoms. The result: an amorphous, in other words, non-crystalline solid body where the atoms remain in an almost disordered state.

What are the benefits of metallic glasses?

A high level of hardness and strength with concurrent extreme elasticity: this unique combination yields countless benefits in the production of amorphous components.

Isotropic behavior

Amorphous components have the same material properties in all directions. This offers many advantages, for example, in additive manufacturing. The build volume can be utilized in the best possible way in combination with the component's orientation.
 

Biocompatibility

3D-printed amorphous components are biocompatible, making them predestined for many medical technical applications. Amorphous implants can be customised to fit the patient's body shape.

Elasticity

Amorphous metals have a high yield strength combined with an elastic elongation of almost 2%. This provides many benefits in the production of implants, sensors or flexure joints as absorption is significantly improved.

Lightweight design

Thanks to the high level of strength, it is possible to make amorphous metallic components thinner, saving more material, and making them lighter. This is particularly important in the robotics or medical technology sectors, as well as in aerospace and e-mobility.

Application in very cold environments

Amorphous metals have low temperature ductility, which means that they are excellent for use in applications with extremely low temperatures and they retain their properties. This makes this material class perfect for the aerospace sector.

Wear resistance

Amorphous metals have a very high level of hardness and therefore little abrasion, comparable with ceramic. This property is particularly important for heavily stressed components in tool and mold making as well as for lifestyle products such as high-quality watches.

Amorphous metals – 3 questions about the new super material

How can amorphous metals be 3D printed?

Together, TRUMPF and Heraeus AMLOY have developed a procedure which works with a very fine focus and extremely small melt volume. The heat dissipates quickly. This equates to the critical cooling time of 200 kelvin per second: a customized and amorphously solidified implant rises out of the powder bed.

What are the advantages of amorphous metals for implants?

Since metallic glasses do not have lattice structures, they behave completely differently to other metals. They are simultaneously extremely strong, highly elastic and very wear-resistant. Implants made of amorphous metals can withstand the enormous stresses and strains in the human body very well. This does not only include knocks or jolts. Biting and chewing regularly subjects the jawbone to constant stress; a rib cage has to withstand around eight million breaths per year.

Why are metallic glasses particularly suited for 3D printing bones?

Amorphous alloys have an elasticity module which is similar to that of human bones. This provides enormous benefits for the healing process and the resilience of the previously weak point in the body. At the same time, alloys are resistant to corrosion and certified in terms of biocompatibility.

Amorphous metal alloys – a look at four characteristics

Heraeus AMLOY has developed ground-breaking alloys which are exceptionally suitable for the production of innovative implants, among other things. Zirconium-based alloys such as Amloy-ZR01 and Amloy-ZR02 are available even now. The latter is already a certified material in terms of biocompatibility in accordance with ISO 10993-5 and ISO 10993-12. Furthermore, titanium is considered a material for medical components such as bone implants or pacemakers. The current research into titanium alloys for applications in medical technology is very promising. Whether titanium or zirconium – amorphous alloys impress with different properties and are therefore particularly suitable for specific applications.

 
Which amorphous applications are available?

From a lifestyle watch to medical technology to lightweight design: amorphous metals open up new application options for a multitude of sectors and industries. One of the main great advantages is the combination of 3D printing and metallic glasses. Find out all about it!

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